How does the DRL relay on a GM car work?
The DRL relay contacts close which provides battery power from the EXT LTS fuse through the right HIGH beam headlight and then through the left HIGH beam headlight before reaching ground. By routing the power in series through both HIGH beam headlights, each light burns at half brightness.
Where is the headlamp relay located on a car?
The headlight relay is located in the left instrument panel fuse block, on the left side of the instrument panel, and the daytime running lights relay is located in the underhood compartment fuse block, which is located in the engine compartment.
What to do if your headlamp relay is not working?
Check the voltage at the dimmer switch. Youll see it on the steering column a rod goes down to the 3 wire switch. Youll need a test light to check your voltage with. helpful? helpful? If the relay is the problem, just unplug the old one and plugin the new.
Where is the daytime running light relay located?
have the same problem? The headlight relay is located in the left instrument panel fuse block, on the left side of the instrument panel, and the daytime running lights relay is located in the underhood compartment fuse block, which is located in the engine compartment.
The DRL relay contacts close which provides battery power from the EXT LTS fuse through the right HIGH beam headlight and then through the left HIGH beam headlight before reaching ground. By routing the power in series through both HIGH beam headlights, each light burns at half brightness.
What are the symptoms of a failing DRL relay?
The location of the control unit may be different depending on what year and model. Symptoms of a failing unit may include DRL warning indicator on, buzzing under dash when headlamps are off, and one or both high beam bulbs may not work. PLEASE LIKE AND SUBSCRIBE !! Loading…
How does GM daytime running lights system work?
Here’s how that GM daytime running lights system works. Thirty seconds after you start your vehicle with the headlights off, the body control module (BCM) checks the voltage on the ambient light sensor. For the DRL system to work, the IGN must be in the RUN position, the parking brake must not be activated and the transmission must not be in PARK.