Heated seat have no power

[briangorman]

The heated seats used to work fine then all of a sudden they just cut out when I was driving one day. No power at all as when I try to turn them on, the buttons don’t light up.

Changed the fuses in the boot still nothing. The lumbar support buttons still work on the seats and everything else works fine in the car just the heated seats won’t turn on.

Is there any other fuses to try change? And if not anyone have any ideas what it could be?

[Rusty2009]

You need a new module by the sounds of it.

[briangorman]

You need a new module by the sounds of it.

Is that an easy swap out? is it one per seat or one for both? And would you know part number and rough cost?

Thanks.

[Rusty2009]

One module on the drivers seat.

It's easier to undo the 2 bolts on the back of the seat tilt forward pull back then tilt the seat backwards.

Undo the 2 screws on the module.

It's from a Mokka
https://www.ebay.co.uk/itm/2014-VAUXHALL...Swuk1ZxONo

[briangorman]

One module on the drivers seat.

It's easier to undo the 2 bolts on the back of the seat tilt forward pull back then tilt the seat backwards.

Undo the 2 screws on the module.

It's from a Mokka
https://www.ebay.co.uk/itm/2014-VAUXHALL...Swuk1ZxONo

Cheers for all the info, managed to get one from a Astra J for £35. So hopefully that fixes it then that’s a cheap fix.

[briangorman]

I changed over that part today and it’s still not working, still no power.

Same part number but the long number at the bottom is different.

Have you got any ideas what it could be?



This is the ebay item number for what I bought - 282775251819

[Rusty2009]

Ok that's rather odd.

Without seeing the car it's hard to know.

Ok so your 100% sure that F21 25 amp in rear board is good?

If it's the fuse & not the module the only things left are heater panel heater pads or wiring issue.

[briangorman]

Ok that's rather odd.

Without seeing the car it's hard to know.

Ok so your 100% sure that F21 25 amp in rear board is good?

If it's the fuse & not the module the only things left are heater panel heater pads or wiring issue.

Yeah the fuse is fine and the module. 

The day it happened the Satnav, the screen in the centre of the speedo and the heated seats all cut out then took a while to come back on. Eventually it all came back on working fine apart from the heated seats.  I took it to vauxhall for an hour diagnoses check but wasn’t long enough and all they said there’s no communication between the botton and seat.

I think I may be down to a wiring issue.

[Rusty2009]

Ok so we have abit more to work with now.

Are all the other buttons working correctly on the heater panel?

You only have one Data wire between the heater panel, HVAC & Seat module.

Another fuse you could check is F14 7.5A in the glovebox fuse board.

Have you tried doing a full shutdown? If not remove the negative off the battery & leave it for 60mins let all systems fully shut down.

[briangorman]

Ok so we have abit more to work with now.

Are all the other buttons working correctly on the heater panel?

You only have one Data wire between the heater panel, HVAC & Seat module.

Another fuse you could check is F14 7.5A in the glovebox fuse board.

Have you tried doing a full shutdown? If not remove the negative off the battery & leave it for 60mins let all systems fully shut down.

Yeah all other buttons are working and everything works fine was just the heated seats that won’t turn on now.

I will try that fuse to see if that works and if not will disconnect for an hour. I had tried it before but only disconnected for 5 mins.

Will get back to you on the outcome.

[briangorman]

I have changed the fuse and kept the battery disconnected for over an hour.

Still nothing, I press both buttons and no lights come on.

Could it be an earth cable or a power supply cable? No lights I presume there’s no power getting to it.

---

I have been reading the heated seat operation and come across this

“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.”

This could possibly be it, do you know the number for it? I don’t have this type of fuse so would have to go to the vauxhall garage to collect it.

[neshov]

The heated seats used to work fine then all of a sudden they just cut out when I was driving one day. No power at all as when I try to turn them on, the buttons don’t light up.

Changed the fuses in the boot still nothing. The lumbar support buttons still work on the seats and everything else works fine in the car just the heated seats won’t turn on.

Is there any other fuses to try change? And if not anyone have any ideas what it could be?

Hi,
I had exactly the same problem.
The K29 controller under the seat did not receive power (checked the voltage on the K29 X1 connector of the controller with a multimeter, which was 0V; ground was OK). Fuse F21RA 25A on the X53A rear fuse block was OK (resistance) and was energized at 12.6V. So the problem was on the installation between the fuse and the K29 controller connector.

I further checked the resistance of all the connectors, in line, in direct connection with the F21RA fuse (using one additional
wire and a multimeter):
- K29 X1 (red cable) to F21RA - resistance 0L.
- X310 Body Harness (pin 1) to F21RA - resistance 1.4kOhm; voltage on that pin was 0.8V.
So there was a huge voltage drop between connector X310 (looked OK) and fuse F21RA, something between them was
burned out. The following connectors are on the X53A rear fuse block, X1 and X2. The X2 had a problem - one pin bearing melted, even the pin was pulled out of the board when the connector was removed.

https://ibb.co/jfDJQwx
https://ibb.co/3MwmHCV

[neshov]

The heated seats used to work fine then all of a sudden they just cut out when I was driving one day. No power at all as when I try to turn them on, the buttons don’t light up.

Changed the fuses in the boot still nothing. The lumbar support buttons still work on the seats and everything else works fine in the car just the heated seats won’t turn on.

Is there any other fuses to try change? And if not anyone have any ideas what it could be?

Hi,
I had exactly the same problem.
The K29 controller under the seat did not receive power (checked the voltage on the K29 X1 connector of the controller with a multimeter, which was 0V; ground was OK). Fuse F21RA 25A on the X53A rear fuse block was OK (resistance) and was energized at 12.6V. So the problem was on the installation between the fuse and the K29 controller connector.

I further checked the resistance of all the connectors, in line, in direct connection with the F21RA fuse (using one additional
wire and a multimeter):
- K29 X1 (red cable) to F21RA - resistance 0L.
- X310 Body Harness (pin 1) to F21RA - resistance 1.4kOhm; voltage on that pin was 0.8V.
So there was a huge voltage drop between connector X310 (looked OK) and fuse F21RA, something between them was
burned out. The following connectors are on the X53A rear fuse block, X1 and X2. The X2 had a problem - one pin bearing melted, even the pin was pulled out of the board when the connector was removed.

https://ibb.co/jfDJQwx
https://ibb.co/3MwmHCV

And here are some pictures of how I solved the problem and now everything works fine:

https://ibb.co/DKXwsqK
https://ibb.co/rytsMX5
https://ibb.co/JyR3zzQ
https://ibb.co/LrZpCNr
https://ibb.co/TMp6NCc
https://ibb.co/44TpSMr