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GMTechBernard, Shop Foreman
Category: Pontiac
Satisfied Customers: 2158
Experience:  GM
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2006 grand prix headlights turn off when driving, bright lights

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2006 grand prix headlights turn off when driving, bright lights will continue to work, sometimes the dimmer headlights will come back on after awhile?

Hello! This is only a guess, but I see this alot in the Grand Prix's, LaCrosses and some of the trucks that use the same setup. The low beam bulbs are powered up by a tiny module in the Underhood Fuse Panel, called an "HDM". Its item #35 in the fuse panel. It controls only the low beams, which is why the high beams still work. Its shaped like a relay, but isn't like the other relays, so you can't swap it out with another relay, you need another HDM for it.

Please let me know if you need additional assistance!

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