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Low Beam Headlights go off and then come back on

5 messages,  Last post on Oct 30, 2009 at 8:09 AM

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#1 of 5 Low Beam Headlights go off and then come back on by tim7581 Jul 04, 2009 (5:30 pm)
I have a 2007 Buick Lacrosse and I was driving at night and had my low beam lights on and they went out so I went to the high beam and they worked. Then later the low beams came back on. Later they went out again.This has continued ever since. Nothing else went wrong. I have checked the alternator and it is putting out at 13.7 steady. I checked the connections on the headlights and they were good. Replies to this message: amkdevile (Jul 05, 2009 3:02 am) amkdevile (Jul 05, 2009 3:28 am) dawina (Oct 30, 2009 7:15 am) tim7581 (Oct 30, 2009 8:09 am)
#2 of 5 Re: Low Beam Headlights go off and then come back on [tim7581] by amkdevile Jul 05, 2009 (3:02 am)
Replying to: tim7581 (Jul 04, 2009 5:30 pm) It sounds like you might have the same problem we had with our 2006 Lacrosse. It was only the low beams. All other lights were on. Parking, tail, and interior dash lights worked. High beams worked when this happened. We could not turn them on manually either. The first thing they replaced after a few trips to the dealer was the Body Control Module. They actually couldn't duplicate the problem. So GM recommended this. We didn't seem to have the problem for awhile. The problem came back or maybe it never left. Anyway, I was able to get the car there when it was doing it. Tech actually able to test. He replaced the Exterior Lighting Relay. We haven't experienced the problem since (5/29/09). The Body Control part was about $150. The Relay was about $ 25. Done under warranty. I think the RELAY was the real problem. Not sure if this is your exact problem, but it might help.
#3 of 5 Re: Low Beam Headlights go off and then come back on [tim7581] by amkdevile Jul 05, 2009 (3:28 am)
Replying to: tim7581 (Jul 04, 2009 5:30 pm) It's me again with 2006. When the problem is happening, our daytime running lights didn't work in the daytime. Again, you can't turn the low beams on manually. Everything else lights up. Also, we noticed that the low beams didn't blink with the key remote when locking or unlocking.
#4 of 5 Re: Low Beam Headlights go off and then come back on [tim7581] by dawina Oct 30, 2009 (7:15 am)
Replying to: tim7581 (Jul 04, 2009 5:30 pm) The low beams quit working just as you described on my 2005 Buick La Crosse. The car has been in the shop for 2 days and they told me to come and get it because they can't make it duplicate the problem. I explained to them that it only happens at night and they had to take it home and drive it at night. They couldn't for some reason. I fount this post and asked them to replace the Relay switch that you described. I will let you know if I think this fixed my problem or not. Replies to this message: tim7581 (Oct 30, 2009 8:09 am)
#5 of 5 Re: Low Beam Headlights go off and then come back on [dawina] by tim7581 Oct 30, 2009 (8:09 am)
Replying to: dawina (Oct 30, 2009 7:15 am) Get your car out of the shop and try to do it without paying anything. Then go to a parts company and buy a relay that goes in the relay box under the hood on the left side of the engine as you are looking at the engine. I cant remember what it is called but you only have 2 relays that deal with your haedlights and this one cost about 65.00$ the other is about 20.00. The relay I am looking at in my hand that was bad has a number 8866 on the top then 15328866 and this is the one from Delphi

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