ALright, this might take awhile so get comfortable. 2004 ss. The drl's quit working properly. they would come on while the car was sitting in the garage, a few days later they stopped all toghter. No biggie right? About 3 weeks later, I lost my low beams. Everything else works, (except drls) I checked all the fuses, the headlight realy. Did a bunch of research, checked the bulbs, the ground on the front support. Changed out the multifunction switch, still dont work,, I have noticed .8 volts on the yellow wire @ the multifuncion. .8 on the brown, and 12.20 on the pink, WHEN the highs are off. it dropps to .8 when they are on. The only other thing Ive found is that the autolamp feature allows the fogs to come on. when I use the headlight switch... they dont.. Ive been working on this for about 4weeks, and am sick of it, Im too proud to take it to a dealer, and am about to trade the dang thing in if I dont get something figured out. Thanks for helping (if you can)

 

Most likely your BCM is bad. Have you heard any "clicking" noises, or have any of the lights been flickering? Dash lights flickering?

 

ahh the bcm... dont laugh. I cant find the son of a (*(*_). ive looked thru numerous post and checked under the pass seat.. above the brake pedal... where is it? LOL

 

sounds like pink is high beam hot, and yellow is low beam hot, they dont let you have them both on because you would blind drivers passing you, its on a 4 pin relay or some sort i'm sure. when you turn high beams on does pink turn to 12.2 volts?

the BCM i always thought it was behind the dash, Ive had my center console apart completly the only area i havn't had apart is my glove box, so i'd say there would be a logical place, especially since your wire harness for your dash comes in right at the passenger side feet. mine is also an 04, not an ss

i'll be honest...stupid as i feel...i cant figuire out my lights completly yet, it seems to have a redudant system, it auto detects at night as well as has manual options. but also can be clicked on, and than into high beam. the whole system is way to complex for a car light system if you ask me :|

 

I probed the pink.(high) at the bulb, have 12.2
I probed it at the signal switch. 12.2

I probed the drk blue at the bulb 12.2
I probed it at the signal switch .8

Im in the process of following the wire so far, thru the firewall I have 12.2

cant figure out how to get the top of the dash off.. if its not 1 thing its another.

 

FIIIXXXEEDDD!! found a bad wire. dark blue, right where it goes thru the firewall!

 

your BCM is above the parking break btw, i looked it up.

 

In the 2004 Monte Carlo SS this is where it is: ((#1 on the image below))