The lights are not coming on at all in DRL mode. No difference with high/low beam. While in DRL mode I put a magazine over the sensor and the lights came on. When I removed the magazine, the lights went off.
You think the light sensor is not working properly?
I photoshopped that pic for another member with a similar problem. Yours is different now. Sigh....
That the low beams work in night-time mode means the relay is OK and so are the downstream fuses, one for each lamp.
What's next in line is the BCM, an expensive computer component near the rear seat fuse block, and the main headlight switch. There's a DRL disable position on the switch, to the extreme left, but even if you did that accidentally, it should reset itself on the next ignition cycle.
For the heck of it, can you try that DRL disable function, and see if the DRL disable lamp on the headlight switch illuminates?
Any chance your parking brake is slightly on, which also disables the DRLs? I just tried the parking brake on my 2004 just now, and having it on did NOT disable the DRLs, so they must have changed the software and didn't tell the manual writers.
My shop manual says the DRLs are also disabled if the transmission is in the PARK position, and I confirmed that's true.
Any chance you've been doing these tests in PARK only and not while in gear?
This is the part of the thread where I want to go crawl under a rock in embarrassment. I was in park. When I took it out of park it worked. Well...fwiw...I have learned something new today. It is much appreciated. I am sorry for wasting any of your time!
Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum
A forum community dedicated to Chevy Trailblazer and GMC Envoy owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, towing capacity, maintenance, and more!