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I've got a 2007 coupe with steering wheel controls. I bought the Peripherals PESWIPS steering wheel interface. The instructions that came with it say that 3 wires are needed:
switched +12V
ground
interface wire
However, the application guide on Peripherals website says I need 4 wires:
switched +12V
ground
interface wire
Pin A6 of the 24 pin factory plug to switched +12V
To those who've installed the PESWIPS module, did you have to do the last step? I also have the GMAH24 and GMACHM. Does pin A6 get power from that?