What is the issue with Buick LaCrosse headlights?

1 Answers
SanClayton
07/30/25 4:57am
There are many reasons for Buick LaCrosse headlight failures, such as: dimmer switch failure, faults between the wiring board and the dimmer switch, etc. The following details the causes: Fuse blown: When the headlight switch is turned on and neither the high nor low beams work, check the fuse box for any blown fuses, and then inspect for any faults between the car light switch and the dimmer switch. Dimmer switch failure: When using a screwdriver to connect the power wire of the dimmer switch to the high and low beam terminals respectively, and the lights turn on, it indicates a fault in the dimmer switch. If the high beams work but the low beams do not when connected, the fault lies between the dimmer switch and the headlights or between the dimmer switch and the low beams.
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