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There is no separate DRL module in this vehicle. DRL is performed by software detecting the need for DRL (daylight and engine running) and achieves DRL by pulsing the power to the high beam lights. The power pulsing is done by the front control module in the integrated power module once it gets the command from the body control module. You'll need a scan tool to see if the BCM has commanded the DRL on. If it is and you're not getting any DRL,
There is no DRL module .
Daytime Running Lamps (DRL)
The DRL are a function of the front turn signal lamps. The DRL will operate when the ignition switch is in the RUN position, the gear selector is not in the PARK position, and the headlamp switch is in the OFF position. When the BCM receives these signals it will signal the turn/hazard flasher module to turn on the DRL by grounding the DRL low control signal. The turn/hazard flasher module supplies voltage to the DRL on the right and left DRL/turn supply voltage circuits. If a front turn signal lamp is inoperative the DRL will not operate.
The DRL can be deactivated by turning the headlamp switch to the DRL OFF position while the DRL are operating. The DRL defeat position of the headlamp switch is a momentary ground signal to the BCM to command the DRL function ON or OFF. After each key cycle the BCM will default to the DRL ON function.
I could be wrong(it would not be the first or last time) but in your vehicle i think what you call the DRL relay IS the DRL module. By the way if you need to know something about the electrical system in a vehicle (especially GM) don't go to Haynes. They try to pack several years of vehicles in one book and that does not work well. If you want good info on your vehicle, go to your GM dealer and tell them you want to read the manual. They don't advertise it, but they are supposed to give you free access to the information. They will let you look, but will charge or not allow photocopying(depends on the dealers mood) of the material. You can write down all the notes you wnt!
Hi, if the high beams work, try swapping out the DRL relay. It's in the big box under the hood. DRL wiring is a bit complicated. BCM and DRL module both come into play. Best approach is to try simple things and hope they work. If not, you'll need a meter to troubleshoot wiring. Let me know if you have questions, and thanks for using FixYa.
its not really a module,its a diode inside a large black heatsink thats about the size of a pack of cigarettes and its located under the drivers side dash about where your right knee is when sitting behind the wheel,it was a VERY common problem for those to blow and.....no more DRL, hope this helps
The drl module is part of the body control module,(bcm) located under the dash on the heater box. The drl relay is in one of 2 places. In the
fuse/relay block on the left fender. Or taped to the body harness near
the hose for the rear washer. The rear washer hose comes out of the
bottom of the front washer bucket to the firewall. Hope this helps.
The problem with the DRL issue describd in the above posts is the DRl module(it needs to be replaced). The buzzing relay and intermittent on/off of passenger side DRl are indicators that the module needs to be replaced.