Headlamp Problems
Thread Starter
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Joined: Nov 2009
Posts: 120
From: El Paso, TX
Yea Ill make sure to go thru it throughly first
Thread Starter
|
Joined: Nov 2009
Posts: 120
From: El Paso, TX
Sorry, last question, I just want to be prepared for all outcomes.
Does it matter if its used or not since Its going to be reprogrammed anyway??
I found this one, just wanted to see if its correct.
http://cgi.ebay.com/ebaymotors/Theft...#ht_2730wt_937
Does it matter if its used or not since Its going to be reprogrammed anyway??
I found this one, just wanted to see if its correct.
http://cgi.ebay.com/ebaymotors/Theft...#ht_2730wt_937
Joined: Jun 2009
Posts: 435
From: New Hampshire
You'll need a tech2 to reprogram it. It doesn't have to be the dealer if you know someone with one and after its reprogrammed you'll also have to go through the security relearn.
As far as a used on goes I'm not quite sure. I haven't replaced on in a gm vehicle yet.
As far as a used on goes I'm not quite sure. I haven't replaced on in a gm vehicle yet.
Joined: Apr 2023
Posts: 1
I just finished looking at the wiring diagrams. I can email you them if you would like. I'm ase certified in electrical so I will walk you through how I would test it. This is assuming you've checked all fuses with a test light. You can never trust looking at them because somethings they will look good even when blown. Basically the headlamp switch provides a signal to the bcm, which commands the relay to turn on, which sends power through the dimmer switch to the headlights.
The relay is located in the fuse panel on the drivers side of the dash. I would check the signal from the headlamp switch which should be a yellow wire at the headlamp switch plug. If thats good then move to the relay. If not then make sure the orange and red wires both have power and the black has ground. If that checks out then its the switch.
The relay is 4 pins, 1 is power, 1 is ground, 1 is signal from the bcm, and 1 is the output to the dimmer switch. Make sure it has power and ground then check the signal. If your not getting the bcm signal then the bcm or a bad wire is the likely culprit, if you are getting this signal then I would move on to the dimmer switch.
At the dimmer switch, check the black wire for ground. If thats good then turn on the headlights and see if you get power at the yellow wire. If thats good see if the brown wire has power when the switch is on low beam. If you don't have power there then the dimmer switch is most likely the cause. if you do i would suspect a bad wire to the headlights.
My guess is its either the switch or bcm. since you don't have drl either it pretty much rules out the dimmer switch because the drl circuit is separate from the low beams.
I hope this helps and i hope it didn't confuse you. i have a hard time putting things into words, lol. Actually before you start this check the sockets for the low beams. When I first bought my monte both low beam sockets were melted and would intermittently work. Let me know you you find
The relay is located in the fuse panel on the drivers side of the dash. I would check the signal from the headlamp switch which should be a yellow wire at the headlamp switch plug. If thats good then move to the relay. If not then make sure the orange and red wires both have power and the black has ground. If that checks out then its the switch.
The relay is 4 pins, 1 is power, 1 is ground, 1 is signal from the bcm, and 1 is the output to the dimmer switch. Make sure it has power and ground then check the signal. If your not getting the bcm signal then the bcm or a bad wire is the likely culprit, if you are getting this signal then I would move on to the dimmer switch.
At the dimmer switch, check the black wire for ground. If thats good then turn on the headlights and see if you get power at the yellow wire. If thats good see if the brown wire has power when the switch is on low beam. If you don't have power there then the dimmer switch is most likely the cause. if you do i would suspect a bad wire to the headlights.
My guess is its either the switch or bcm. since you don't have drl either it pretty much rules out the dimmer switch because the drl circuit is separate from the low beams.
I hope this helps and i hope it didn't confuse you. i have a hard time putting things into words, lol. Actually before you start this check the sockets for the low beams. When I first bought my monte both low beam sockets were melted and would intermittently work. Let me know you you find