10:th-Feb-2015, 08:56:13
Right I've just checked and yes there is only 1 wire used to send the signals, you maybe able to tap into this but it might lead to problems. I hope the below will help.
Astra-J 2.0 CDTI S/S
Retrofitted AFL, TPMS, Navi950, BT, DAB, Rear Camera, Infinity sound system, Towbar, Flexfloor & more.
I can do programming and retrofits using genuine GM MDI and Dealer software.