I have a 08 ls without pioneer and onstar. I got the 70-2202 and of course a aftermarket hu. Out of the hu is yellow, black, red, orange/white, blue/white, grey, grey/black, white, white/black, purple, purple/black, and green, green/black. I hooked them to the same color on the metra 70-2202 and plug the metra to the factory harness. I still have a orange only wire left from the metra. When I turn on the car nothing happens. What's wrong?!?!?

Today I figured out there was a blown fuse so I replaced that. When I put the new fuse in the fuse box on the passenger kick panel the headunit lights up but turns off in about 3 seconds. I've tried with with the key on engine off and still it lights up then turns off. Do I need to reside someone in the harness to a fuse tap?

 

run a acc wire to it seperatly from a fuse...

 

ya the red isnt acc its data. disconnect that asap before you blow ur BCM

 

So I do or don't use the red wire to a fuse?

 

yes u need to have the red wire to a fuse. nothing going thru the red wire supplied in the cobalt harness. just radio harness

 

see thats what i meant but jj u say things so much clearer i have to get used to this forum thing...ive installed a radio in a few gms and i always had to run an acc wire...i dont get it so their data wire just acts as a Relay? wierd

 

well instead off a straight 12v acc signal the bcm actually talks to the radio and tells it to turn on turn off with confirmation and all that stuff.... basically its just a hell alot more complicated