A dedicated daytime running light module is used in some vehicles to automatically control low beam headlight operation. The module receives input from various sensors and switches including the ambient light sensor, ignition switch, headlamp switch and parking brake switch. It then uses this information to adjust the low beam headlights as needed. A defective daytime running light module can result in low beam headlights that stay suck on, operative erratically or don’t work at all.
Part 1 of 3: Locate the daytime running light module
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- Protective gloves
- Repair manuals (optional)
- Safety glasses
- Wrench or ratchet and sockets of the appropriate size
Step 1: Locate the daytime running light module. Typically, the daytime running light module is located under the dash or in the engine compartment. The exact location can be found in the vehicle repair manual.
Part 2 of 3: Remove the daytime running light module
Step 1: Disconnect the negative battery cable. Disconnect the negative battery cable and set it aside.
Step 2: Unbolt the module. Unbolt the module from the vehicle using the appropriate size wrench or ratchet and socket.
Step 3: Disconnect the electrical connector(s). Disconnect the electrical connector(s) by pushing down on the tab by hand and sliding it off.
Step 4: Remove the module from the vehicle.
Part 3 of 3: Install the new daytime running light module
Step 1: Mount the new module in position.
Step 2: Connect the electrical connector(s). Connect the electrical connector(s) by pushing them into position until they click into place.
Step 3: Bolt the module into place. Bolt the module to the vehicle using the appropriate size wrench or ratchet and socket.
Step 4: Reinstall the negative battery cable. Reconnect the negative terminal to the battery.
That’s what it takes to replace your daytime running light module. If this seems like a task you’d prefer to leave to a professional, YourMechanic offers expert daytime running light module replacement.
This article originally appeared on YourMechanic.com as How to Replace a Daytime Running Light Module and was authored by Mia Bevacqua.