VXOC Astra-J/GTC

Heated Seats Description and Operation

Heated Seat Components

The driver and passenger heated seats consist of the following components:

• Left heated seat switch

• Right heated seat switch

• HVAC control

• Seat heating control module

• Driver seat cushion heating element

• Driver seat backrest heating element

• Driver seat cushion temperature sensor

• Passenger seat cushion heating element

• Passenger seat backrest heating element

• Passenger seat cushion temperature sensor

Power and Ground

Battery positive voltage is supplied at all times to the seat heating control module through a 30 A fuse located in the underbonnet fuse block. This voltage is used by the module to supply power to the seat heating elements. Ground for the module is provided at G307.

Heated Seat Operation

The driver and passenger heated seats are controlled by a single seat heating control module that is located under the driver seat cushion. Both heated seats are controlled by separate heated seat switches that are located in the HVAC control. When a heated seat switch is pressed, a serial data message is sent from the HVAC control to the HVAC control module indicating the heated seat command. The HVAC control module serves as a gateway to transmit the message to the heated seat control module via the serial data line. In response to this signal, the seat heating control module applies battery positive voltage through the element supply voltage circuit to the appropriate seat heating elements. The seat heating control module then sends a serial data message back to the HVAC control module to gateway the information to the HVAC control to either illuminate or turn off the appropriate temperature indicator.

Temperature Regulation

When the engine is ON, the heated seats will initialise in the OFF state. With each activation of the heated seat switch, the seat heating control module will cycle the temperature setting in the following manner: HIGH, MEDIUM, LOW, and OFF.

The seat heating control module monitors the seat temperature through the temperature sensor signal circuit and the temperature sensor (thermistor) that is located in the seat cushion. The temperature sensor is a variable resistor, it's resistance changes as the temperature of the seat changes. When the temperature sensor resistance indicates to the seat heating control module that the seat has reached the desired temperature, the module opens the ground path of the seat heating elements through the heated seat element control circuit. The module will then cycle the element control circuit open and closed in order to maintain the desired temperature.

Load Management

The electrical power management function is designed to monitor the vehicle electrical load and determine when the battery is potentially in a high discharge condition. The heated seat system is one of the vehicle loads that is subject to reduction during a battery discharge condition. For more information on load management refer to Electrical Power Management Description and Operation.

Front Seat Heater Control Module Replacement

[Image: Front%20Seat%20Heater%20Control%20Module...cement.jpg]

Preliminary Procedures

Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection.

[TR]
[TD]Callout[/TD]
[TD]Component Name[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]Front Seat Heater Control Module Fastener (Qty: 2)
Caution: Refer to Fastener Caution[/COLOR] in the Preface section.
Procedure

1. Move the front seat full backward.
2. Move the front seat in upper position.
3. Disconnect wiring harness connectors.
4. For programming and setup, refer to Control Module References.
[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]Front Seat Heater Control Module[/TD]
[/TR]

Driver or Passenger Seat Cushion Heater Replacement

[Image: Driver%20or%20Passenger%20Seat%20Cushion...cement.jpg]

Preliminary Procedures
Remove the front seat cushion cover. Refer to Front Seat Cushion Cover and Pad Replacement.

[TR]
[TD]Callout[/TD]
[TD]Component Name[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]Driver or Passenger Seat Cushion Heater[/TD]
[/TR]

Driver or Passenger Seat Back Cushion Heater Replacement

[Image: Driver%20or%20Passenger%20Seat%20Back%20...cement.jpg]

Preliminary Procedures
Remove the front seat back cushion cover. Refer to Driver or Passenger Seat Back Cushion Cover and Pad Replacement.

[TR]
[TD]Callout[/TD]
[TD]Component Name[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]Driver or Passenger Seat Back Cushion Heater[/TD]
[/TR]

Symptoms - Seat Heating and Cooling

Note: The following steps must be completed before using the symptom tables.

1. When diagnosing a heated seat system condition perform the Diagnostic System Check - Vehicle , before using the symptom tables in order to verify that all of the following are true:

• There are no DTCs set.

• The control module(s) can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Heated Seats Description and Operation

Visual/Physical Inspection

• Inspect for aftermarket devices which could affect the operation of the power seats. Refer to Checking Aftermarket Accessories.

• Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

• Inspect the seat adjuster track for conditions which may cause binding or objects within the seat adjustment range which obstruct movement or interfere with wiring.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.

Symptom List

Refer to the Front Heated Seat Malfunction diagnostic procedure in order to diagnose the symptom.

Front Heated Seat Malfunction

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

[TR]
[TD]Circuit[/TD]
[TD]Short to Ground[/TD]
[TD]Open/High Resistance[/TD]
[TD]Short to Voltage[/TD]
[TD]Signal Performance[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Element Control Terminal 3 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2425 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2425 0B, B2425 0E[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Element Control Terminal 1 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2425 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2425 0B, B2425 0E[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Cushion Temperature Sensor Signal[/TD]
[TD]B1925 02[/TD]
[TD]B1925 05[/TD]
[TD]B1925 05[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Cushion Temperature Sensor Low Reference[/TD]
[TD]--[/TD]
[TD]B1925 05[/TD]
[TD]--[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Element Control Terminal 5 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2430 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2430 0B, B2430 0E[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Element Control Terminal 2 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2430 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2430 0B, B2430 0E[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Cushion Temperature Sensor Signal[/TD]
[TD]B2170 02[/TD]
[TD]B2170 05[/TD]
[TD]B2170 05[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Cushion Temperature Sensor Low Reference[/TD]
[TD]--[/TD]
[TD]B2170 05[/TD]
[TD]--[/TD]
[TD]B2345 13[/TD]
[/TR]

Circuit/System Description

The driver and passenger heated seats are controlled by separate heated seat switches that are located in the HVAC control. When a heated seat switch is pressed, a serial data message is sent from the HVAC control to the HVAC control module indicating the heated seat command. The HVAC control module serves as a gateway to transmit the message to the heated seat control module via the serial data line. In response to this message, the seat heating control module applies battery positive voltage through the element supply voltage circuit to the appropriate seat heating elements. The seat heating control module then sends a serial data message back to the HVAC control module to gateway the information to the HVAC control to either illuminate or turn off the appropriate temperature indicator.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics
Connector End View Reference

Component Connector End Views
Description and Operation

Heated Seats Description and Operation
Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1.Engine ON, observe the scan tool Driver Seat Heating/Venting/Cooling Mode parameter while pressing the driver HEATED seat switch. The reading should change between Off and Back & Cushion Heat.
⇒ If not the specified value, replace the A26 HVAC control.

2.Observe the scan tool Passenger Seat Heating/Venting/Cooling Mode parameter while pressing the passenger HEATED seat switch. The reading should change between Off and Back & Cushion Heat.
⇒ If not the specified value, replace the A26 HVAC control.

3.If all scan tool parameter readings are normal, there are no DTCs set, and the driver and/or passenger heated seat is inoperative, replace the K29 seat heating control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Heater and Air Conditioning Control Replacement

• Control Module References for seat heating control module replacement, setup, and programming

[Image: 9nd4_zpsea5fce57.jpg]

DTC B1925 or B2170

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1925 02: Driver Seat Cushion Heater Sensor Circuit Short to Ground

DTC B1925 05: Driver Seat Cushion Heater Sensor Circuit High Voltage/Open

DTC B2170 02: Passenger Seat Cushion Heater Sensor Circuit Short to Ground

DTC B2170 05: Passenger Seat Cushion Heater Sensor Circuit High Voltage/Open

Diagnostic Fault Information

Circuit/System Description

The heated seat temperature sensor that set this diagnostic trouble code (DTC) is located in the seat cushion just under the seat cover with the seat heating element. The seat heating control module supplies a 5 V reference voltage through the temperature sensor signal circuit and a ground through the low reference circuit to the sensor. The module monitors the voltage of the sensor signal circuit to determine the temperature of the seat. The temperature sensor varies in resistance based on the temperature of the heating element causing the signal voltage to change. Once the seat reaches the set temperature, the module will then cycle the control circuit of the heating elements ON and OFF in order to maintain the desired seat temperature based on the feedback voltage from the sensor.

Conditions for Running the DTC

• DTC B1325 must not be present.

• The seat heating control module must be powered.

Conditions for Setting the DTC

B1925 02 or B2170 02

The temperature sensor voltage drops below 0.6 V for more than 1 second.

B1925 05 or B2170 05

The temperature sensor voltage is greater than 5 V for more than 1 second.

Action Taken When the DTC Sets

The heated seat function for the affected seat will be disabled.

Conditions for Clearing the DTC

• The current DTC will clear and set the code to history 3 seconds after the reference voltage returns to normal operating range and the ignition is cycled OFF then back to ACC or RUN.

• The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Heated Seats Description and Operation

Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

B1925 02 or B1925 05

Ignition OFF, disconnect the X2, X3 harness connectors at the K29 seat heating control module.
Test for 500 O - 300 kO between the signal circuit terminal 3 X3 and the low reference circuit terminal 13 X2.

⇒ If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the E14B seat cushion heating element.

⇒ If greater than the specified range, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the E14B seat cushion heating element.

Ignition OFF, connect the X2, X3 harness connectors at the K29 seat heating control module and disconnect the harness connector at the E14B seat cushion heating element.
Ignition On, test for 4.8 - 5.2 V between the signal circuit terminal 2 and ground.

⇒ If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K29 seat heating control module.

⇒ If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K29 seat heating control module.

If all circuits test normal, replace the K29 seat heating control module.

B2170 02 or B2170 05

Ignition OFF, disconnect the X2, X3 harness connectors at the K29 seat heating control module.
Test for 500 O - 300 kO between the signal circuit terminal 4 X3 and the low reference circuit terminal 14 X2.

⇒ If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the E14D seat cushion heating element.

⇒ If greater than the specified range, test the signal circuit and the low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the E14D seat cushion heating element.

Connect the X2, X3 harness connectors at the K29 seat heating control module and disconnect the harness connector at the E14D seat cushion heating element.
Ignition On, test for 4.8 - 5.2 V between the signal circuit terminal 2 and ground.

⇒ If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K29 seat heating control module.

⇒If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K29 seat heating control module.

If all circuits test normal, replace the K29 seat heating control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Driver or Passenger Seat Cushion Heater Replacement

• Control Module References for seat heating control module replacement, setup, and programming

[Image: 9nd4_zpsea5fce57.jpg]

DTC B2345

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B2345 13: Seat Heater Disable Circuit Low Voltage High/Temperature

Diagnostic Fault Information

[TR]
[TD]Circuit[/TD]
[TD]Short to Ground[/TD]
[TD]Open/High Resistance[/TD]
[TD]Short to Voltage[/TD]
[TD]Signal Performance[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Element Control Terminal 3 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2425 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2425 0E[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Element Control Terminal 1 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2425 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2425 0E[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Cushion Temperature Sensor Signal[/TD]
[TD]B1925 02[/TD]
[TD]B1925 05[/TD]
[TD]B1925 05[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Cushion Temperature Sensor Low Reference[/TD]
[TD]--[/TD]
[TD]B1925 05[/TD]
[TD]--[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Element Control Terminal 5 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2430 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2430 0E[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Element Control Terminal 2 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2430 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2430 0E[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Cushion Temperature Sensor Signal[/TD]
[TD]B2170 02[/TD]
[TD]B2170 05[/TD]
[TD]B2170 05[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Cushion Temperature Sensor Low Reference[/TD]
[TD]--[/TD]
[TD]B2170 05[/TD]
[TD]--[/TD]
[TD]B2345 13[/TD]
[/TR]

Circuit/System Description

The seat heating control module controls seat heating operation for both the driver and front passenger seats. The heating elements are controlled through individual high side and low side control circuits. The low side control circuits for both seats are connected to a common reference point internal to the module. This reference point is biased to approximately 2.5 V. Before the seat heating control module will allow heated seat operation, it checks to see if this biased voltage is shorted to ground or voltage. Once the module verifies that it is not closing to a shorted heating element, it allows for heated seat operation. The module will then continue to monitor the heating elements for a shorted circuit.

Conditions for Running the DTC

The seat heating control module must be powered.

Conditions for Setting the DTC

B2345 13

Any temperature sensor input that remains below 1.5 V for more than 1 second.

Action Taken When the DTC Sets

The heated seat function for both seats will be disabled.

Conditions for Clearing the DTC

• The current DTC will clear and set the code to history 3 seconds after the reference voltage returns to the normal operating range and the ignition is cycled OFF then back to ACC or RUN.

• The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Heated Seats Description and Operation

Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2, X3 harness connectors at the K29 seat heating control module.
2. Test for greater than 3.0 kΩ between the signal and the low reference circuits listed below:

• E14B driver seat cushion terminal 3 X3 and terminal 13 X2

• E14D passenger seat cushion terminal 4 X3 and terminal 14 X2

⇒ If less than the specified value, test for a short between the signal and low reference circuits. If the circuits test normal, replace the appropriate E14 seat cushion heating element.

3. If all circuits test normal, replace the K29 seat heating control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Driver or Passenger Seat Back Cushion Heater Replacement

• Driver or Passenger Seat Cushion Heater Replacement

• Control Module References for seat heating control module replacement, setup and programming

[Image: 9nd4_zpsea5fce57.jpg]

DTC B2425 or B2430

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B2425 0B: Driver Seat Cushion Heater Circuit High Current

DTC B2425 0D: Driver Seat Cushion Heater Circuit High Resistance

DTC B2425 0E: Driver Seat Cushion Heater Circuit Low Resistance

DTC B2430 0B: Passenger Seat Cushion Heater Circuit High Current

DTC B2430 0D: Passenger Seat Cushion Heater Circuit High Resistance

DTC B2430 0E: Passenger Seat Cushion Heater Circuit Low Resistance

Diagnostic Fault Information

Circuit/System Description

The driver and front passenger heated seats are controlled by the seat heating control module that is located under the driver seat cushion. When the heated seat is active, the module applies power through a common voltage supply circuit to the seat heater elements. The module controls the seat temperature by providing a pulse width modulation (PWM) ground through the seat heater element control circuit to the heater elements. The module then monitors the current flow through the heating elements and the rate of change of the temperature sensor to verify correct heated seat operation.

Conditions for Running the DTC

• DTC B1325 must not be present.

• Engine must be running.

• The seat heating control module must be powered and the heated seat must be enabled.

Conditions for Setting the DTC

B2425 0D or B2430 0D

By measuring current and voltage output to the seat heating elements every 10 seconds, the seat heating control module calculates that the heating element resistance is above the maximum resistance.

B2425 0B, B2425 0E, B2430 0B, or B2430 0E

By measuring current and voltage output to the seat heating elements every 10 seconds, the seat heating control module calculates that the heating element resistance is below the minimum resistance.

Action Taken When the DTC Sets

The heated seat function for the affected seat will be disabled.

Conditions for Clearing the DTC

• The current DTC clears when the malfunction is no longer present, and the power mode changes to OFF then back to ACC or RUN.

• The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Heated Seats Description and Operation

Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

B2425 0B, B2425 0D, or B2425 0E

1. Ignition OFF, disconnect the harness connector at the E14A seat back heating element.Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.

2. Test for 0.5 - 5 Ω between terminal 1 and terminal 2.
If not within the specified range, replace the E14A seat back heating element.

3. Connect the harness connector at the E14A seat backrest heating element and disconnect the X2 harness connector at the K29 seat heating control module.Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.

4. Test for 1 - 7 Ω between control circuit terminal 3 and control circuit terminal 1.
⇒ If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14B seat cushion heating element.
⇒ If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14B seat cushion heating element.

5.If all circuits test normal, replace the K29 seat heating control module.

B2430 0B, B2430 0D, or B2430 0E

1. Ignition OFF, disconnect the harness connector at the E14C seat back heating element.Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.

2. Test for 0.5 - 5 Ω between terminal 1 and terminal 2.
⇒ If not within the specified range, replace the E14C seat back heating element.

3.Connect the harness connector at the E14C seat backrest heating element and disconnect the X2 harness connector at the K29 seat heating control module.Note: Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.

4. Test for 1 - 7 Ω between control circuit terminal 5 and control circuit terminal 2.
⇒ If less than the specified range, test for a short between the control circuits. If the circuits test normal, replace the E14D seat cushion heating element.
⇒ If greater than the specified range, test the control circuits for an open/high resistance. If the circuits test normal, replace the E14D seat cushion heating element.

5. If all circuits test normal, replace the K29 seat heating control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Driver or Passenger Seat Cushion Heater Replacement

• Control Module References for seat heating control module replacement, setup, and programming

[Image: 9nd4_zpsea5fce57.jpg]

DTC B242A

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B242A 01: Seat Heaters Common Circuit Short to Battery

DTC B242A 02: Seat Heaters Common Circuit Short to Ground

Diagnostic Fault Information

[TR]
[TD]Circuit[/TD]
[TD]Short to Ground[/TD]
[TD]Open/High Resistance[/TD]
[TD]Short to Voltage[/TD]
[TD]Signal Performance[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Element Control Terminal 3 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2425 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2425 0E[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Element Control Terminal 1 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2425 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2425 0E[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Cushion Temperature Sensor Signal[/TD]
[TD]B1925 02[/TD]
[TD]B1925 05[/TD]
[TD]B1925 05[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Driver Heated Seat Cushion Temperature Sensor Low Reference[/TD]
[TD]--[/TD]
[TD]B1925 05[/TD]
[TD]--[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Element Control Terminal 5 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2430 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2430 0E[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Element Control Terminal 2 X2[/TD]
[TD]B242A 02[/TD]
[TD]B2430 0D[/TD]
[TD]B242A 01[/TD]
[TD]B2430 0E[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Cushion Temperature Sensor Signal[/TD]
[TD]B2170 02[/TD]
[TD]B2170 05[/TD]
[TD]B2170 05[/TD]
[TD]B2345 13[/TD]
[/TR]
[TR]
[TD]Passenger Heated Seat Cushion Temperature Sensor Low Reference[/TD]
[TD]--[/TD]
[TD]B2170 05[/TD]
[TD]--[/TD]
[TD]B2345 13[/TD]
[/TR]

Circuit/System Description

The seat heating control module controls the seat heating operation for both the driver and front passenger seats. The module controls the heating elements through individual high side and low side control circuits. The low side control circuits for both seats are connected to a common reference point internal to the module. This reference point is biased to approximately 2.5 V. Before the seat heating control module will allow heated seat operation, it checks to see if this biased voltage is shorted to ground or voltage. Once the module verifies that it is not closing to a shorted heating element, it allows for heated seat operation. The module will then continue to monitor the heating elements for a shorted circuit.

Conditions for Running the DTC

• DTC B1325 must not be present.
• The seat heating control module must be powered.

Conditions for Setting the DTC

B242A 01

The seat heating control module detects a short to voltage on the heater element control circuits.

B242A 02

The seat heating control module detects a short to ground on the heater element control circuits.

Action Taken When the DTC Sets

The heated seat function for both seats will be disabled.

Conditions for Clearing the DTC

• The current DTC will clear and set a history code 3 seconds after the reference voltage returns to normal operating range and the ignition is cycled OFF then back to ACC or RUN.

• The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Heated Seats Description and Operation

Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the K29 seat heating control module.

2.Test for infinite resistance between the control circuit terminal 3 and ground.
⇒ If not the specified value, test the control circuit for a short to ground.

3. Test for infinite resistance between the control circuit terminal 5 and ground.
⇒ If not the specified value, test the control circuit for a short to ground.

4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 3 and ground.
⇒ If the test lamp illuminates, test the control circuit for a short to voltage.

5. Verify that a test lamp does not illuminate between the control circuit terminal 5 and ground.
⇒ If the test lamp illuminates, test the control circuit for a short to voltage.

6. If all circuits test normal, replace the K29 seat heating control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for seat heating control module replacement, setup, and programming

[Image: 9nd4_zpsea5fce57.jpg]

[Image: Heated%20Cooled%20Seat%20Schematics.jpg]

There are some connections on the heater pads themselves which I can't get any info on other than what's in the table below.

[TR]
[TD]E14A[/TD]
[TD]Seat Heating Element – Driver Back[/TD]
[TD]KA1[/TD]
[TD]In the passenger compartment, in the back of the driver seat[/TD]
[/TR]
[TR]
[TD]E14B[/TD]
[TD]Seat Heating Element – Driver Cushion[/TD]
[TD]KA1[/TD]
[TD]In the passenger compartment, in the cushion of the driver seat[/TD]
[/TR]
[TR]
[TD]E14C[/TD]
[TD]Seat Heating Element – Passenger Back[/TD]
[TD]KA1[/TD]
[TD]In the passenger compartment, in the back of the passenger seat[/TD]
[/TR]
[TR]
[TD]E14D[/TD]
[TD]Seat Heating Element – Passenger Cushion[/TD]
[TD]KA1[/TD]
[TD]In the passenger compartment, in the cushion of the passenger seat[/TD]
[/TR]
[TR]
[TD]E15[/TD]
[TD]Steering Wheel Heater[/TD]
[TD]UVD[/TD]
[TD]In the passenger compartment, in the steering wheel[/TD]
[/TR]

Left Front Seat Components

[Image: Left%20Front%20Seat%20Components.jpg]

[TR]
[TD](1)[/TD]
[TD]B153D Seat Belt Buckle - Driver (LHD) or B153P Seat Belt Buckle - Passenger (RHD)[/TD]
[/TR]
[TR]
[TD](2)[/TD]
[TD]E14A Seat Heating Element - Driver Back (KA1/LHD) or E14C Seat Heating Element - Passenger Back (KA1/RHD)[/TD]
[/TR]
[TR]
[TD](3)[/TD]
[TD]F106L Side Air Bag - Left[/TD]
[/TR]
[TR]
[TD](4)[/TD]
[TD]A14D Seat Lumbar Support Pump - Driver (LHD) or A14P Seat Lumbar Support Pump - Passenger (RHD)[/TD]
[/TR]
[TR]
[TD](5)[/TD]
[TD]M53D Seat Lumbar Support Motor -- Driver (LHD) or M53P Seat Lumbar Support Motor -- Passenger (RHD)[/TD]
[/TR]
[TR]
[TD](6)[/TD]
[TD]E14A Seat Heating Element - Driver Back Connector (KA1/LHD) or E14C Seat Heating Element - Passenger Back Connector (KA1/RHD)[/TD]
[/TR]
[TR]
[TD](7)[/TD]
[TD]E14B Seat Heating Element - Driver Cushion (KA1/LHD) or E14D Seat Heating Element - Passenger Cushion (KA1/RHD)[/TD]
[/TR]
[TR]
[TD](8)[/TD]
[TD]B153D Seat Belt Buckle Connector- Driver (LHD) or B153P Seat Belt Buckle Connector- Passenger (RHD)[/TD]
[/TR]
[TR]
[TD](9)[/TD]
[TD]X310 Body Harness to Driver Seat Harness (B6/LHD) or X315 Body Harness to Passenger Seat Harness (RHD)[/TD]
[/TR]
[TR]
[TD](10)[/TD]
[TD]K29 Seat Heating Control Module (KA1)[/TD]
[/TR]
[TR]
[TD](11)[/TD]
[TD]F113D Seat Belt Anchor Pretensioner - Driver (LHD) or F113P Seat Belt Anchor Pretensioner - Passenger (RHD)[/TD]
[/TR]
[TR]
[TD](12)[/TD]
[TD]A14D Seat Lumbar Support Pump - Driver (LHD) or A14P Seat Lumbar Support Pump - Passenger (RHD)[/TD]
[/TR]
[TR]
[TD](13)[/TD]
[TD]S65D Seat Lumbar Support Switch - Driver (LHD) or S65P Seat Lumbar Support Switch - Passenger (RHD)[/TD]
[/TR]
[TR]
[TD](14)[/TD]
[TD]E14B Seat Heating Element - Driver Cushion (KA1/LHD) or E14D Seat Heating Element - Passenger Cushion (KA1/RHD)
[/TD]
[/TR]

Seat Heating Control Module
In the passenger compartment, under the driver seat

[Image: 9nd4_zpsea5fce57.jpg]

K29 Seat Heating Control Module X1

[Image: K29%20Seat%20Heating%20Control%20Module%20X1.jpg]

Connector Part Information

Harness Type: Driver Seat
• OEM Connector: 88988990
• Service Connector: Service by Harness - See Part Catalog
• Description: 2-Way F Metri-Pack 280 Series (BK)

Terminal Part Information

• Terminated Lead: Pending
• Release Tool: Pending
• Diagnostic Test Probe: Pending

K29 Seat Heating Control Module X1

[TR]
[TD]Pin[/TD]
[TD]Wire[/TD]
[TD]Circuit[/TD]
[TD]Function[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]2.5 BK[/TD]
[TD]150[/TD]
[TD]Ground[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]2.5 RD[/TD]
[TD]140[/TD]
[TD]Battery Positive Voltage[/TD]
[/TR]

K29 Seat Heating Control Module X2

[Image: K29%20Seat%20Heating%20Control%20Module%20X2.jpg]

Connector Part Information

• Harness Type: Driver Seat
• OEM Connector: 15134091
• Service Connector: 15134091
• Description: 16-Way F 1.5 Series (BK)

Terminal Part Information

• Terminated Lead: Pending
• Release Tool: 15315247
• Diagnostic Test Probe: J-35616-2A

K29 Seat Heating Control Module X2

[TR]
[TD]Pin[/TD]
[TD]Wire[/TD]
[TD]Circuit[/TD]
[TD]Function[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]1.0 VT/BK[/TD]
[TD]2424[/TD]
[TD]Driver Heated Back Element Return[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]1.0 GY/BK[/TD]
[TD]2480[/TD]
[TD]Passenger Heated Seat Element Return[/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]1.0 BN/VT[/TD]
[TD]2077[/TD]
[TD]Driver Heated Seat Element Supply Voltage[/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]--[/TD]
[TD]--[/TD]
[TD]Not Used[/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD]1.0 BK/D-BU[/TD]
[TD]2479[/TD]
[TD]Passenger Heated Seat Element Supply Voltage[/TD]
[/TR]
[TR]
[TD]6-12[/TD]
[TD]--[/TD]
[TD]--[/TD]
[TD]Not Used[/TD]
[/TR]
[TR]
[TD]13[/TD]
[TD]0.5 BK/YE[/TD]
[TD]2080[/TD]
[TD]Low Reference[/TD]
[/TR]
[TR]
[TD]14[/TD]
[TD]0.5 BK/GY[/TD]
[TD]2435[/TD]
[TD]Low Reference[/TD]
[/TR]
[TR]
[TD]15-16[/TD]
[TD]--[/TD]
[TD]--[/TD]
[TD]Not Used[/TD]
[/TR]

K29 Seat Heating Control Module X3

[Image: K29%20Seat%20Heating%20Control%20Module%20X3.jpg]

Connector Part Information

• Harness Type: Driver Seat
• OEM Connector: 89047364
• Service Connector: 89047364
• Description: 12-Way F 64 Series (BK)

Terminal Part Information

• Terminated Lead: Pending
• Release Tool: J-38125-215A
• Diagnostic Test Probe: J-35616-64B (L-BU)

K29 Seat Heating Control Module X3

[TR]
[TD]Pin[/TD]
[TD]Wire[/TD]
[TD]Circuit[/TD]
[TD]Function[/TD]
[/TR]
[TR]
[TD]1-2[/TD]
[TD]--[/TD]
[TD]--[/TD]
[TD]Not Used[/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]0.5 YE/GY[/TD]
[TD]2079[/TD]
[TD]Driver Heated Seat NTC Signal[/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]0.5 WH/GY[/TD]
[TD]2434[/TD]
[TD]Passenger Heated Seat NTC Signal[/TD]
[/TR]
[TR]
[TD]5-10[/TD]
[TD]--[/TD]
[TD]--[/TD]
[TD]Not Used[/TD]
[/TR]
[TR]
[TD]11[/TD]
[TD]0.5 D-GN[/TD]
[TD]5060[/TD]
[TD]Low Speed GMLAN Serial Data[/TD]
[/TR]
[TR]
[TD]12[/TD]
[TD]--[/TD]
[TD]--[/TD]
[TD]Not Used[/TD]
[/TR]

Front Seat Cushion Cover and Pad Replacement

Removal Procedure
Warning: Refer to SIR Warning .

Warning: Replace the passenger presence system as a complete assembly to prevent possible injury to the occupant. The bladder, the pressure sensor, the seat cushion, and the control module are assembled and calibrated as a unit. Using only some of the components in the service kit will cause the passenger presence system to operate improperly.
1. Remove the driver or passenger seat. Refer to Driver or Passenger Seat Replacement .
2. Remove the driver or passenger seat inner recliner finish cover. Refer to Driver or Passenger Seat Inner Recliner Finish Cover Replacement .
3. Remove the front seat cushion side finish panel. Refer to Front Seat Cushion Side Finish Panel Replacement .

2027608

4. Detach the driver or passenger seat back cushion cover on the lower rearside of the backrest.
5. Release and disconnect the backrest wiring harness plug (1), if equipped.
6. Remove the 4 front seat backrest bolts (2).
7. Remove the backrest from the seat.

2027611

8. Detach the driver or passenger seat cushion cover (1) from the seat frame (3) all way round.
9. Remove the driver or passenger seat cushion cover along with the pad from the seat frame.
10. Remove the driver or passenger seat cushion cover (1) from the pad (2), remove hogrings.
Installation Procedure

2027611

1. Install the driver or passenger seat cushion cover (1) to the pad (2), install hogrings.
2. Install the driver or passenger seat cushion cover along with the pad to the seat frame (3).
3. Attach the driver or passenger seat cushion cover (1) to seat frame (3) all way round.

2027608

4. Install the backrest to the driver or passenger seat.

Caution: Refer to Fastener Caution .

5. Tighten the 4 driver or passenger seat back cushion frame bolts (2) to 35 NÂ·m (26 lb ft) .
6. Connect and latch the backrest wiring harness plug (1), if equipped.
7. Attach the cushion cover to the backrest below.
8. Attach the driver or passenger seat back cushion cover on the lower rearside of the backrest.
9. Install the front seat cushion side finish panel. Refer to Front Seat Cushion Side Finish Panel Replacement .
10. Install the driver or passenger seat inner recliner finish cover. Refer to Driver or Passenger Seat Inner Recliner Finish Cover Replacement .
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Seats > Seat Hardware, Trim and Upholstery > Repair Instructions > Front Seat Cushion Cover and Pad Replacement

looks like i will be replacing the front drivers heater pad very soon
as it is cutting out more and more now so any help with removing the seat cover any tips will be welcome thank,s.

I have hog rings and pliers mate

can you reuse them when they come off i may take it out Monday and see what is going on

No you have to cut them I know some people have used cable ties instead

thanks i must look this up further then Thumbs

Hello guys,

Im really happy to find some informations on how to solve the seat heating problems on our Opel/Vauxhall Astra J.

Recently I got a B2425 DTC, it said "too high resistance", so I'm guessing it's the B2425 0D DTC. I know where the K29 X2 connector is located, but I'm still trying to find out where I can find the E14A connector.

Obviously it's located somewhere in the back of the seat, but my brain just doesn't want to get it. @tucpal did a really great How To, I want to follow it but firtly need to find out which heating element is broken.

So: Is the E14A connector the yellow one or the white-black one (-> pictures) ?

I' really appreciate your help! Smile

yellow plugs are for the airbags

E14A is not a connector it's a heater pad Which is the Drivers back cushion.

The Fix Vauxhall do doesn't last long I've just brought a cascada interior to replace the front seats in mine Not heard of any heater seat issues on them I know John got a zafria Touerer seat to replace his..

The zafira one I put in worked a charm, same seat but doesn't have the white line stitched down it.

You just need to swap pretensioner and buckle over.

So basicly you need to change the entire seat to a similar one, but from a Cascade or Zafira where there a no issues known. Do I understand you right?

In Germany most people either change the K29 X2 connector (mine is already the updated one with the green colour, although it's a 2011, but only the driver seat heating doesn't work, it shuts down after 1-2 minutes on level 2 and 3) or change the broken seat heating elemnt. But some of them also said the the problem occurred after roughly a year again. Passenger seat heating works entirely fine on mine though, so I thought I would just follow the instructions in the first post.

But if you say that most likely it won't be the solution, I don't know if I should change the heating element, considering it costs around 130€, which is about 115£. On the other side, buying a whole new seat doesn't make sense too, since in Germany it should cost really much.

I paid less than the price of the seat heater pad for 2016 zafira seat with less than 15000 miles on it so to me it made far more sense, and I believe Rusty got a good deal on his seats to.
Definitely worth a look around.

So the seats from 2015-2016 mainly doesn't have the problem anymore and fit onto the Astra J?

Thats actually a really good solution, since you doesn't have to battle with removing the heating element, which is really annoying. Didn't thought about that one, thanks guys! Smile

Now I just need to find one, which is from a 2015-2016 car, this is gonna be the most difficult task... Don't even know where to start searching this seat.

(8:th-May-2018, 16:16:33)Kenno71 Wrote: [ -> ]So the seats from 2015-2016 mainly doesn't have the problem anymore and fit onto the Astra J?

Thats actually a really good solution, since you doesn't have to battle with removing the heating element, which is really annoying. Didn't thought about that one, thanks guys!

Now I just need to find one, which is from a 2015-2016 car, this is gonna be the most difficult task... Don't even know where to start searching this seat.

They do come up on ebay, just a case of keep searching really

I wouldn't bother looking a 2015-2016 Astra J seat they still have the issue.

But yes swapping the seat out has to be the cheaper quicker option, I paid £180 for the Cascada seats which is both front's and rear with centre console the bonus is the cascada seats have fan's in them for seat cooling & the passenger seat has lumber with after 2011-2012 was dropped from the J's.

Even seats starting from 2011 are a recommendation if they still work?

(9:th-May-2018, 17:48:09)Kenno71 Wrote: [ -> ]Even seats starting from 2011 are a recommendation if they still work?

Not if they come out of a J no.

Don't know where they went wrong on the j but they certainly didn't get the seat heaters right.

Like rusty says zafira, cascada ideal and as new as possible will give you the aesthetics as well.

But, at least in Germany, there are the same heating problems on the Cascadas and Zafiras as on the Astras. Does Vauxhall/Opel use different manufactures?

(11:th-May-2018, 13:17:10)Kenno71 Wrote: [ -> ]But, at least in Germany, there are the same heating problems on the Cascadas and Zafiras as on the Astras. Does Vauxhall/Opel use different manufactures?

I can't see them using a different manufacture but I've certainly not found any complaints here about the zaffy and cascada heater seats.

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

Rusty2009

tucpal

tucpal

Dicko

tucpal

Dicko

tucpal

Kenno71

vocky

Rusty2009

Jpbroad1970

Kenno71

Jpbroad1970

Kenno71

Jpbroad1970

Rusty2009

Kenno71

Rusty2009

Jpbroad1970

Kenno71

Rusty2009