09 headlights at random on & off

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09 headlights at random on & off

Unread post by Woodchuck » Thu Sep 03, 2015 8:56 pm

    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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    Re: 09 headlights at random on & off

    Unread post by carriedi » Fri Sep 04, 2015 3:55 am

    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
    buick lacrosse headlight schematic2.jpg
    Buick LaCrosse headlight wiring diagram.
    buick lacrosse headlight schematic2.jpg (23.82 KiB) Viewed 1292 times
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    Re: 09 headlights at random on & off

    Unread post by Dexterwise » Sun Sep 13, 2015 4:46 pm

    Chk all fuses in the hood, batterterminal connections for looseness, and chk if the connctors are weak.

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