2007 buick lucerne low beam headlights not working
Did you try replacing the headlamp bulbs ?
Low Beam Headlamp Operation
The low beam headlamps may be turned ON in 3 different ways:
• When the headlamp switch in the HEAD position for normal operations
• When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)
• When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay
When the headlamp switch is placed in the HEAD position, ground from G304 is applied through headlamps ON switch signal circuit to the body control module (BCM), signaling the headlamps ON request. In response to this signal, the BCM applies ground through the headlamp low beam relay control circuit energizing the LO BEAM PCB Relay. With the relay energized, battery voltage is applied through the switch side of the relay, the left and right low beam fuses, and the low beam supply voltage circuits illuminating the low beam headlamps. Ground for both headlamps is provided at G104.
Do you know how to test automotive electrical circuit's using a DVOM - digital volt ohmmeter ? Also ,do you know what a PCB relay is ? PCB - printed circuit board relay , which means it's soldered onto the circuit board inside the under hood fuse box . Using a wiring diagram check input from headlamp switch to the BCM ( you could do this with a scan tool if you had a professional type ) And check for control of PCB relay . at connector 2 pin 10 underside of under hood fuse box . You would need print out of connectors for under hood fuse box to determine which one you need to check . Your best bet mite be to have a qualified repair shop check it out .
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3 days ago