I'm in a sticky situation.. I have a 02 Tahoe z71 and my headlights come on and stays on as long as the truck is running. i replaced the master switch with one out the junkyard. The master headlight switch doesn't work when the truck is running. I tried pressing the dome override button 4x's but that didnt work. I was gonna change the ambient light sensor next week.. is there anything else that it could be? Can someone point me in the rite direction.
headlights don't work off switch
- Thread starter 02YukonD
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ScottyBoy
Full Access Member
You said it doesn't work "when the truck is running". Does that mean that it functions perfectly fine when the engine is off?
If it does work fine with the engine off, try it with the parking brake engaged. If they go off when the parking brake is engaged, then I would say you definitely need to replace the ambient light sensor. I had this same problem and I really placed mine a few years ago. It was under $20 at my local Chevy dealer.
If it does work fine with the engine off, try it with the parking brake engaged. If they go off when the parking brake is engaged, then I would say you definitely need to replace the ambient light sensor. I had this same problem and I really placed mine a few years ago. It was under $20 at my local Chevy dealer.
omega123
TYF Newbie
Wow mine just started doing this a few days ago and im writing this down to try on my next day off.
Could it be the bcm?? or should I try ordering a brand new switch. My truck is having a few issues like the interior light don't come on when the driver door is open, the instrument cluster light went out, and the headlights problem
ScottyBoy
Full Access Member
Do you install a new ambient light sensor? Or a used one from a junkyard?
ScottyBoy
Full Access Member
Do you recall the part number? The part for 00-02 trucks is different than the one for 03-06 trucks. If you DID install the correct one, I'm not exactly sure what else it could be?? I had the same EXACT symptoms as you, and the parts guy a few he dealership told me to check it by putting on the parking brake (like I told you to do) and if the lights went out then it's the sensor. I replaced the sensor and all has been fine ever since.
Only other thing that I can think of would be the headlight switch. You mentioned that you press the dome override button and it doesn't affect the headlights. I remember when my headlights were doing this, I pressed the override button and the lights DID shut off. But every other symptom was exactly the same. Maybe that headlight switch is bad?
Only other thing that I can think of would be the headlight switch. You mentioned that you press the dome override button and it doesn't affect the headlights. I remember when my headlights were doing this, I pressed the override button and the lights DID shut off. But every other symptom was exactly the same. Maybe that headlight switch is bad?
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El Capitan
Senior Texas Member
Having the same issue, checked fuses, replaced both dash sensors, replaced headlamp switch, still not functioning properly, next I will be trying a bcm.
El Capitan
Senior Texas Member
Classic Buick GMC of Carrollton says I will have it in 1-3 days and I'll have one of the guys at Pro-Tech Electronics flash it to my vehicle and I will let you know.
alacran
Full Access Member
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any updates?
El Capitan
Senior Texas Member
Got my BCM Today. Waiting for Protech to come reflash.
El Capitan
Senior Texas Member
Finally got protech out to my shop today. No luck. However after BCM replacement we pulled codes for ambient light sensor low input which was not present before, so BCM may have been bad anyways), so what I am going to do now is order 2 light sensors (since I am going to have the dash apart anyways) and check wires to light sensors and replace sensors again. Won't have time until Sunday to do so, will update as soon as possible.
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