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#4508966 - 09/06/17 11:31 AM Crazy 06 Buick Lacrosse problem
lucerne06 Offline


Registered: 03/07/09
Posts: 446
Loc: northeast
Hopefully someone can help, my 2006 Buick Lacrosse CX with 63,000 well kept miles on it has suddenly started acting up. When you park and turn off the car and lock it up,within a few hours the doors unlock themselves and the front bumper lights as well as the rear running lights come on, and will not shut off. You can open the door and even manually turn the lights from AUTO setting to OFF, but they still will not turn off..The only way to shut them off is to start the car, put in drive move slightly forward then turn the car off again.Then within a few hours it happens all over again??? I discontented the battery for ten min to clear or reset but did not help. The headlamp relay switch was replaced last year under recall and I removed the relay but the lights stayed on.

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#4508969 - 09/06/17 11:35 AM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
Inspecktor Online   content


Registered: 03/16/14
Posts: 642
Loc: Twin Cities MN USA
CHRISTINE!!!!!
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2001 Ranger 3.0 151,000 mi
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#4508984 - 09/06/17 11:51 AM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
ndfergy Offline


Registered: 03/28/16
Posts: 418
Loc: burlington ,ontario, canada
Faulty door switch?
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#4508986 - 09/06/17 11:53 AM Re: Crazy 06 Buick Lacrosse problem [Re: ndfergy]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Originally Posted By: ndfergy
Faulty door switch?


Yep either that or a short somewhere.
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#4509013 - 09/06/17 12:24 PM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
SatinSilver Offline


Registered: 01/24/08
Posts: 10128
Loc: OH
A battery starting to poop out possibly.

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#4509042 - 09/06/17 12:47 PM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
Hootbro Offline


Registered: 08/25/03
Posts: 2414
Loc: DELAWARE
Body Control Module, wiring, headlamp switch, bad grounds, fuse block, corrosion in connector and myriad of other possibilities.

You need a schematic and someone with troubleshooting skills and a meter to start going over this. Anything else is just stabbing in the dark guesses.
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#4509051 - 09/06/17 12:56 PM Re: Crazy 06 Buick Lacrosse problem [Re: Hootbro]
SatinSilver Offline


Registered: 01/24/08
Posts: 10128
Loc: OH
As mentioned check corrosion on battery terminals. If present, clean and grease. Walmart TLE has a good battery protection service for $3.50. Includes a good cleaning, lubing with grease and NOCO felt washers.

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#4509083 - 09/06/17 01:27 PM Re: Crazy 06 Buick Lacrosse problem [Re: SatinSilver]
lexus114 Offline


Registered: 05/12/08
Posts: 6298
Loc: Easton, PA
Originally Posted By: SatinSilver
A battery starting to poop out possibly.



this ^^^^^^^^^^^ my fil`s 07 lincoln interior light would not shut off. and turns out the batt was the culprit.


Edited by lexus114 (09/06/17 01:28 PM)
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#4509167 - 09/06/17 03:21 PM Re: Crazy 06 Buick Lacrosse problem [Re: Hootbro]
HangFire Offline


Registered: 08/21/13
Posts: 2506
Loc: Central Maryland
Originally Posted By: Hootbro
Body Control Module, wiring, headlamp switch, bad grounds, fuse block, corrosion in connector and myriad of other possibilities.

Yup, it's probably in the first 6. Hopefully not the last one.
Originally Posted By: Hootbro

You need a schematic and someone with troubleshooting skills and a meter to start going over this. Anything else is just stabbing in the dark guesses.

Maybe. Burnish all the grounds, terminals, and connections, check and maybe replace the battery, you've got a good chance of catching it.
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#4509220 - 09/06/17 04:21 PM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
lucerne06 Offline


Registered: 03/07/09
Posts: 446
Loc: northeast
crazy, also seems to do this mainly at night

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#4509512 - 09/06/17 09:16 PM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
Hootbro Offline


Registered: 08/25/03
Posts: 2414
Loc: DELAWARE
Originally Posted By: lucerne06
crazy, also seems to do this mainly at night


You having a high dew point at night? If so, I would lean towards moisture in electronics.
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#4509574 - 09/06/17 10:26 PM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
lucerne06 Offline


Registered: 03/07/09
Posts: 446
Loc: northeast
not so sure, it poured here all day long, it did not happen at all during th day...just happened again 4 hours after it was parked at 22A;00 tonihht...this time I used the remte to lock the doors again and the lihts went out..we shall se for how long..also had the battery tesetd it had a full charge.

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#4509609 - 09/06/17 11:34 PM Re: Crazy 06 Buick Lacrosse problem [Re: lucerne06]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
This case would make an excellent YouTube video for sharp dudes like flmmaz the Ford mechanic.

lucerne06, how far are you from North Carolina ?

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#4510635 - 09/08/17 08:00 AM Re: Crazy 06 Buick Lacrosse problem [Re: Hootbro]
HangFire Offline


Registered: 08/21/13
Posts: 2506
Loc: Central Maryland
Originally Posted By: Hootbro
Originally Posted By: lucerne06
crazy, also seems to do this mainly at night

You having a high dew point at night? If so, I would lean towards moisture in electronics.

Or something related to the headlight switch/circuit.
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