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Q: lo beam lights dont work on 2007 Buick LaCrosse

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I know the lamps are good, fuses are good, no "relays". I believe it's the HDM beam module. I cannot find the part anywhere. Is there another name for it?
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Make sure that you have power going to the HDM module, which is basically an electronic relay.
here is an online repair manual source so you can see what you need to do. Look at the wiring for the headlights,

http://bit.ly/mitchell_repair_manuals_online
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