Changed bulbs checked fuses all good
Replace the light relay.
SOURCE: High beams work but low beams do not. Fuses seem to be good
Hi
I would start with the dimmer switch if you know the lights are good dimmer switches do this you will lose your high beam or you will lose your low beam when they go bad.
SOURCE: 2007 Forrester - headlight bulb good but not lighting
You will need to look at the plug for the headlight. If it looks good, I would look for the headlight low beam fuse.
SOURCE: 1998 pontiac grad prix low beams not working?
It sounds like it's your Headlight switch has gone bad, I'm thinking that the high beams are the daytime running light which is the same as your High beams.
If you go to Auto Zone or Parts Source, they have the replacement switch with step by step instructions.
If you remove the headlight switch from the dash, check the orange wire for power, if there is 12 volts. Good chance's are that the switch is bad, common on the GM's.
Good luck and keep me posted.
SOURCE: 2006 grand prix low beam headlight do not work,
I'm having the same issue. I have changed the bulbs and fuses. I can't find a relay but I don't think that is the issue. Some other people have suggest the Dimmer Control Switch. I am working on that. Please let me know what you find out.
The Grand Prix uses separate bulbs for low beams and high beams. The low beams are located on the outer edge of the headlight assemblies while the high beams are located on the inner edge of the assemblies. With this in mind, locate the position of the burned out bulb prior to replacing it.
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