I just recently installed a Kenwood HU in my 2003 S-10 Blazer and want to regain use of my steering wheel controls. I purchased the pac-audio SWI-jack and have it mostly hooked up. Except that I need to find the wire used to control the buttons on the wheel. Anyone have a good idea of what wire I need to tap?

 

On an '04, there are 2 wires that need to be hooked up to the stereo plug. A6 is RAP SUP VOLT (I'm guessing RAP Supply Voltage) and A7 is REQ SIG INPUT. Don't know how (or if) these relate to an aftermarket head unit.

 

I figgured it out thanks to a multimeter and banging my head against a wall. It was the a6 and a7 but i had to tap into the fuse box to bring power back over there and tap the violet wire with the jack. pain in the behind but my controls are back!