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CoRifleman

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  1. Want to follow up for anyone else who has this issue. I tested both the BCM out and BCM in for the DRL and found that if I manually triggered the DRLs on the BCM out side, the fuse box would act correctly and fire them up, meaning it had to be in the bcm. I also verified that the ambient light sensor was performing correctly. I contacted a local dealer about an appointment to have the programming of the BCM reviewed. Shortly after the truck was built, the BCM was reflashed with a program that disabled the DRLs and Auto Headlamps (AHL). The dealer had to contact GM and have a new software built and sent to them. Then they flashed the new software onto the trucks BCM. That fixed the issue.
  2. Ha, yeah you're probably right, not knowing why it wasn't working, the last guy probably broke the cover off thinking it was a sensitivity problem.... but even with a light shining directly on it, there's no activity (although I used an led light, and I'm not sure those trigger sensors - and at night there is no activity at all). Nothing in the DIC is about the DRL or autolamps, just approach and exit lighting. I've checked the obvious fuses that tie into this circuit, but I guess I could go through 1 by 1 and see if something strange is popped. Doors lock and unlock with the truck being put into gear, so I know the correct "gear" command is being seen by the BCM. The Ebrake indicator lights up on the dash, I so I am "assuming" the BCM is getting that input as well. And yes, my tests were done with the light switch installed - I was able to change its position and get different wires to show ground (correctly). I had read that if you ground that D-GN wire off the headlamp switch that it gives a off signal to the bcm and the auto lamps don't come on - I made sure there's no continuity to ground on that lead, in case someone had tried that, but it doesn't show any connection to ground when the lamps are set to "auto". I've got a scanner that can do quite a bit, but definitely not dealer level BCM stuff. I don't even know if you can get those on the "private" market without shelling out for a Tech2 or something insane.
  3. Going to cross post this in hopes I can square this away - I apologize if this is the wrong spot and will remove it if necessary. Just bought a fleet 2013 Silverado 2500HD. When I first got it, the ambient light sensor cover was broken off, ie sensor exposed. Neither the DRL or AHL seem to work. I can manually turn on the headlamps and they work fine. The truck does NOT have RPO T61 (DRL), but also does NOT have RPO T62 (DRL Delete). It DOES have RPO T74 (Auto Headlamp / Delay). I've replaced the ambient light sensor with the new GM part number (the original number was superceded). Troubleshooting: I verified that if I ground BCM connector X4 (Black), pin 23 (l-gn/bk), the DRLs come on. Which means all wiring in the fuse box, the on board pcb relay, and wiring to the fuse box are good. To me, that leaves the inputs needed to energize the relay in the BCM (ambient sensor, in-gear, no ebrake) or the BCM programming. As best I can tell, the gear selector and ebrake trigger/sensors work correctly. Regarding the AHL, I went to the headlamp switch and verified that the L-BU (parking), D-Gn (OFF), and WH (Headlamp) lines all rest at 12v and drop to 0 when the switch is on their position. Any ideas?
  4. Going to cross post this in hopes I can square this away. Just bought a fleet 2013 Silverado 2500HD. When I first got it, the ambient light sensor cover was broken off, ie sensor exposed. Neither the DRL or AHL seem to work. I can manually turn on the headlamps and they work fine. The truck does NOT have RPO T61 (DRL), but also does NOT have RPO T62 (DRL Delete). It DOES have RPO T74 (Auto Headlamp / Delay). I've replaced the ambient light sensor with the new GM part number (the original number was superceded). Troubleshooting: I verified that if I ground BCM connector X4 (Black), pin 23 (l-gn/bk), the DRLs come on. Which means all wiring in the fuse box, the on board pcb relay, and wiring to the fuse box are good. To me, that leaves the inputs needed to energize the relay in the BCM (ambient sensor, in-gear, no ebrake) or the BCM programming. As best I can tell, the gear selector and ebrake trigger/sensors work correctly. Regarding the AHL, I went to the headlamp switch and verified that the L-BU (parking), D-Gn (OFF), and WH (Headlamp) lines all rest at 12v and drop to 0 when the switch is on their position. Any ideas?
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