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Buick: daytime running lights..night the low beam goes out..high beam…

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I have a 06 Buick...
I have a 06 Buick LaCrosse, the daytime running lights goes off after about 30 minutes of driving.and at night the low beam goes out. I must use the high beam. Can you help me? tHANKS.
Submitted: 8 years ago.Category: Buick
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Answered in 28 minutes by:
1/9/2010
Buick Mechanic: Roadside Jerry, auto mechanic replied 8 years ago
Roadside Jerry
Roadside Jerry, auto mechanic
Category: Buick
Satisfied Customers: 2,948
Experience: auto mechanic with over 40 years experience
Verified
Hi, you have either a headlamp switch, wiring or body control module that is failing when hot. I can send you the head lamp wiring diagram and the test procedures for checking the circuits. If are going to attempt the repair yourself,if the body control module (BCM)proves to be defective, be aware that it must be programed by a dealer or shop with the reprograming equipment. Let me know if you need this information and I will down load it for you.
Roadside Jerry
Roadside Jerry, auto mechanic
Category: Buick
Satisfied Customers: 2,948
Experience: auto mechanic with over 40 years experience
Verified
Roadside Jerry and 87 other Buick Specialists are ready to help you
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Customer reply replied 8 years ago
I want to do the repairs myself. Would you send me the necessry information? Thanks
Buick Mechanic: Roadside Jerry, auto mechanic replied 8 years ago

graphicgraphicgraphicgraphicgraphicgraphicgraphicHi, sorry to get back to you so late in the day.Thanks for the accept and the generous bonus.I have downloaded the diagrams and the test procedures for check the low beam and the DRL circuits. The wiring diagram is in a few parts, I did this so it would be large enough to read clearly. If you print it you can attach the sheets and you will have the complete diagram for your reference.

graphicgraphic

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Buick Mechanic: Roadside Jerry, auto mechanic replied 8 years ago

Hi, one of the other experts here on JA, MPMoore, has just brought it to my attention that he has had several vehicles with the same problem. It turned out to be a defective

HDM bulb relay. It is # XXXXX as indicated in the fuse block diagram I am sending.

graphic

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Customer reply replied 8 years ago
Thank you very much.
Buick Mechanic: Roadside Jerry, auto mechanic replied 8 years ago
Your very welcome, thanks for the accept.
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