Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.
Here is a wiring diagram of the headlamp system.
The BCM controls all lighting functions with inputs from the Headlamp Switch and Dimmer Swtich. Within the Underhood Fuse Block are two Printed Circuit Board Relays one for Low Beam and one for High Beam. When grounded by the BCM, they supply Voltage to the LT LO BEAM and RT LO BEAM fuses. Or LT HI BEAM and RT HI BEAM fuses.
I would check the voltage coming out to the drivers headlight from the bcm.
check voltage at the Left LO beam Fuse.
Right side of glove box under dash.
Here is a diagram of the BCM
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ASE Master Technician
Most common problem is the wiper motor itself. I would start with replacing the part. I have seen this before and replaced the wiper motor and the wipers were working properly after repair.
Let me know if you have any more questions. thanks
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