How do you test a DRL module?
Diagnose the DRL relay daylight hours with parking brake OFF and transmission in drive, remove the DRL relay from the socket and use your voltmeter to check for battery voltage on one terminal in the relay socket and partial voltage in another terminal. Then check for good ground on the other two terminals.
Do LED bulbs work with DRL?
Yes, you can use LED bulbs as DRLs, but you need to ensure they’re car compatible, correctly installed, and dimmed at night to prevent blinding other drivers. You might also need extra components such as a resistor or CANBus adapter to avoid flickering. The components you’ll need to install an LED bulb as a DRL.
Why do my DRL flicker?
A common reason for the DRL flickering is a failed communication between the computer system of the vehicle and the electrical system of the LED daytime running lights (DRL). Another common cause of flickering LED DRL bulb is an unsteady AC power supply.
Why are my GM running lights not working?
By routing the power in series through both HIGH beam headlights, each light burns at half brightness. GM and many other car makers choose the HIGH beam headlights as the DRL source to avoid burning out the filaments in the low beams. Check the EXT LTS fuse.
How to troubleshoot a daytime running lights problem?
Use a Phillips screwdriver to remove the light assembly. Place all of the screws in a safe place so that none of them are lost. Tug on the electrical connector at the rear of the assembly. If the connector comes out or is loose, plug it securely into the rear of the assembly.
What to do when your car lights don’t work?
Check the EXT LTS fuse. With a friend in the vehicle, start the engine during daylight hours with parking brake OFF and transmission in drive. Remove the connector from the right high beam bulb and check for battery voltage on the orange wire. If you see battery voltage, you’ve confirmed the fuse is good and the wiring to the right beam is good.