Daytime Running Lights Wiring Diagram. The system doesn't work like that because the daytime running lights run run by the bcm the same wires are used by the headlight system here is a guide to help you test the wires and the headlight and drl wiring diagrams so you can see how it works. Daytime running lights wiring diagram effectively read a electrical wiring diagram, one offers to find out how typically the components in the system operate.

Measure the resistance of the relays. Engine must be running for correct operation. The main body ecu controls the daytime running light no.