So i just installed an AVH-X5600bhs in my 2010 cobalt LT sedan.. everything works perfectly except the dimmer. Im running the proper metra/axxcess wiring harness and one thing that I did notice is that both the illumination and dimmer wires go nowhere... being on the metra/axxcess side they are there but on the factory harness size there is no wires. I saw that its suppose to be a gray wire but I dont see it anywhere.

Does anyone know what pin and which plug the factory illumination wire goes? I found them for the upgraded radio and other years, just not for my 2010

 

Head Unit Power
Wire Color Polarity Location Plug/Pin# Note

Battery RED/WHITE (+) RADIO HARNESS C1 PIN 1

Accessory THE RADIO HARNESS DOES NOT PROVIDE A SWITCHED POWER SOURCE.

Ground BLACK/WHITE (-) RADIO HARNESS C1 PIN 8

Illumination GRAY (+) RADIO HARNESS C1 PIN 2

 

do 07+ vehicles have illumination? i thought that was done via gm Lan

 

It is.

After lots of research I finally found a thread talking about this. I guess I need to find another source now.

ps... I am the op. I forgot I made this SN years ago when I was in the market for an ss

 

depending on how tech savy you are theres 2 options if you must have illumination (not dimmer btw)

1 module harness. the box decodes the data signal and gives u illumination

2 think alarm... when you install an alarm you have to tap somewhere to get a headlight signal. I did this on my old 06 and it worked fine but if you dont know what your doing you probably shouldn't try this

 

I was hoping I could grab something off of the hvac panel or fuse block.

 

now that I thought about it, I guess the hvac would be controlled the same way haha. oops