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    I have a 2009 Buick LaCrosse CX 3.8 . What i have is that the headlights turn on and off by them self at random . Not running parked nobody around. Can use some help on this one . Thanks Chuck

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    Location: Oregon
    you're going to have to check it when it's acting up. there is a relay called the HDM relay #35 in the underhood fuse box. you're have to check to see if the BCM is sending out the signal to turn on the relay or the relay is turning on the light by itself.

    the headlight switch, the BCM or the HDM relay need to be checked when the headlights are on by themselves.

    scan for codes

    File comment: Buick LaCrosse headlight wiring diagram.
    buick lacrosse headlight schematic2.jpg
    buick lacrosse headlight schematic2.jpg [ 23.82 KiB | Viewed 1220 times ]
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    Chk all fuses in the hood, batterterminal connections for looseness, and chk if the connctors are weak.

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