Can anyone tell me where the Body control module is on a 2004 ZR2 Blazer? I have a left side low beam not working and i'm showing a bad wire. It's a yellow wire. I have checked the fuse box and all is good there. Scratching my head. Any help would be greatly appreciated,Thank you.

 

Should be behind the knee bolster.

 

Headlamps use ground side switching. The circuit goes through the multifunction switch and is ultimately grounded by the BCM.

When the low beams are turned on, remove the bulb, the yellow wire should show less than 5 ohms resistance to ground and the yellow with black stripe should show battery voltage. Post your results.

 

Good showing on yellow and black but showing replace on yellow wire.

 

Run a jumper wire between the left & right low beams on the yellow wire. Apparently the right side ground circuit is ok and the left side failed somewhere. They both follow the same path to ground so a jumper wire will fix the problem.