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Buick LaCrosse Electrical/Lighting Problems



  • I would start with the HDM module, this seems to be a coomon problem on these model year Buick's. You can get them from Autozone or Advance Auto Parts, simply remove your old one and take it in, the unit will have the original GM part # on it that they can cross reference against their aftermarket part. let me know if this works. Good luck!
  • e_net_ridere_net_rider Posts: 1,380
    It would seem highly unlikely, but I actually had broken filaments in both low beams. What likely made it difficult is they were intermittant. And if I touched the connector they would reconnect making me think it was actually a connector problem.
  • I first noticed the problem about 4 months ago. My low beam headlights went out while driving at night, and it took a few minutes for them to come back on. High beams worked. It didn't do it again for about a month. Now the problem is that if the car sits for a long time (approximately 12 hours) it won't start. I replaced the battery because I was informed my old one was bad. I have had the altenator tested, and it is good. However, someone told me that there is something on the side of the altenator that could go bad and there is no way of testing it and the only way to replace it is by getting another altenator. I have also been told there is a possible short or the body control module. I have noticed that when you turn the car off, and before you open the doors the radio will go off then come back on then go off and then back on. I know the radio is supposed to stay on for awhile before going off on its own and staying off but this doesn't do that. Also the lights for the heater (the ones that light up the sides to control the temperature and along the bottom, not the ones that illuminate in the middle showing actual temp) flashes off and on. Not continously but approximately every 5 minutes. This happens even when the car is off, the keys removed, the door has been opened and closed (and I am assuming all night, I haven't sat all night to watch it). The radio and heater also glows an orange/red light after being turned off and I have gotten out of the car. Eventually it goes off. About a month ago, my heater/ac fan started acting up. At first it started out as being off and on. Sometimes you would get in the car and it would work. Then it quit for about 2 weeks and wouldn't work at all, then one morning I got up and accidentally turned it on and it worked and has been working ever since. I have to always check my battery voltage to be sure it will start. If it falls below 11.2 it won't start. When I jump start it, it is easy to start. You don't have to let it sit and charge for a while before it will start, usually hooking the jumper cables up to both cars will make it start. It has become unreliable, and I am afraid to go anywhere and stay for a while. I can unhook a battery cable and then hook it back up but that is aggravating. Anyone have any ideas? or this problem? Thanks.
  • gmcustsvcgmcustsvc Posts: 4,001

    I apologize for the problems you are experiencing with your vehicle. Were you planning on having the vehicle diagnosed by a GM dealership? Please keep me posted.

    Thank you,
    Caron, GM Customer Service
  • Although weirdness like this was occuring in 95-99 Aurora, although such functioning was controlled by the BCM it turned out to have a different root cause.
    Again, this vehicle may be quite different.
    The problem was caused by the multifunction switch on the column that controlled high/low beams, etc. The grease in the switch seemed to be drying out and caused it. Many took their vehicle to dealer and had the column wiring harness replaced at an expense of $500 and up. Someone figured out that washing the switch out with solvent and contact cleaner cured the issue. I can testify that it worked. If you decide to try such, be prepared for a mess with lots of absorbent material, towels, etc.

    Good Luck
  • The guy that told me it was a short or the BCM is a certified GM mechanic. I am seriously thinking about getting rid of the car. Thanks for your responses. I appreciate it.
  • The guy that went into my freon system and changed expansion valve when it was obvious the problem was related to the electronics or control of the heater core/evaporator control door is a certified GM mechanic.
    I can only guess if he was following GM written procedure, received a bad expansion valve, or was working mainly in the profit interest of the dealership.
    The saleswoman at Cadillac dealership claimed to be certified knowledgeable. She was pushing the OnStar system saying the minutes were cheap, claiming it worked off satelite, SATTCOMM, and got indignant when I tried to correct her that the phone works off cell system. She actually stormed away.
  • On my way to VA yesterday, a new gremlin popped. Both hands on steering wheel, it started getting hot for about 2 minutes. The only explanation is the heat turned itself on for about that length of time.
    Control head or pinched wire? Remember, the column was changed. And since then there has been the play in the steering and also a nagging question as to whether the magnasteer is working or not. That is the electro-mechanical device that adds steering effort the faster you go. That is any input from the road toward the steering wheel should be reduced proportionally the faster you go.
  • update. I drove to gas station to get a couple of packs of cigs, about 2 miles.
    On the way it occured to me to try the wheel heater. It started to heat, but I was almost there already. Turning it on again when I left, no heat at all, all the way home. Indicator light came on and stayed on.
  • dminerdminer Posts: 3
    What was the part number, my wife has the same problem, I asked aobut the light relay and was informed that there is only a high beam light relay.
  • The "volt" light on my dashboard keeps coming on and off intermittently, although the alternator tests good for charging. My mechanic has replaced the alternator twice in the last 10 days and it still happens, so he's going to replace it with yet another one. He says the sensor that turns this light on, is inside the alternator. My Haynes manual shows the wiring going from the negative side of the light to the PCM, not direct to the alternator. Can somebody please help me, and perhaps tell me where I can get a GM wiring diagram specific to my car? Thanks!
  • gmcustsvcgmcustsvc Posts: 4,001
    We can also look into this for you with your VIN and more information about the part that you are seeking. Please feel free to contact Christina by email for more assistance. Thank you.

    Tricia, GM Customer Service.
  • dminerdminer Posts: 3
    What is Christina's email address?
  • I looked up my service record. The exterior lighting relay was replaced on 5/29/09.
    We have not had the problem since. Our car is a 2006 LaCrosse CX. The part number for the relay that was installed is: 15016745 . Hope this can help ! Also this relay could be called a fog lamp relay ( daytime running lights). When the problem
    occurs, the daytime running lights did not work during the daytime.
  • Hope I didn't confuse the issue. The low beam headlights didn't work either. No daytime running lights in daytime. No low beam headlights manually or auto - day or night. Key fob didn't flash exterior lights either.
  • dminerdminer Posts: 3
    I am going to give it a try, thank you for all your help. I hope this works. Thank you again!
  • gmcustsvcgmcustsvc Posts: 4,001
    It is in my user profile, just click on my user name.
    GM Customer Service
  • alchipalchip Posts: 14
    Our 2006 LaCrosse CX has a dimly lit digital odometer in the dashboard. The mileage display is only half lit and it is virtually impossible to see during the day. Is there any way to affordably fix this? I called a shop today and they gave me a rough estimate of $ 550 because they said the odometer is really a light strip which would need replacement, and of course, the dash would have to be removed. Seems like a lot just to easily read the mileage! Thanks.
  • I am having a similar problem with my 2011 Buick Lacrosse CXS that was purchased brand new. This problem occurred around 5,000 some odd miles in February of 2012 and it is now August of 2012. My car has been in and out of the dealership over numerous days. (It will be a total of around 48 days now, which is completely ridiculous.) It has died on the highway twice with no electronics/brakes/steering, putting my safety in danger as well as others. The car is also having problems not starting and has been a frequent problem. The dealership has replaced body control modules, frayed wires under the steering column, key less entry modules, and media center modules. GM is clearly trying everything in the book to avoid classifying it as a lemon. Mind you, this car has also had quality assurance issues such as the bumper being misaligned with the vehicle, the back covers of the entertainment system DVD seat covers popping off, plastic of console coming off, and a rattling in the wheel well brake shield covers. This car is brand new and has been having all of this issues! There is no reason for a vehicle to be brought into service that many times! So with that said, I have began to documenting everything very closely. I have written a letter to GM demanding the buyback of the vehicle along with explaining all of the problems and concerns. (remember to keep copies of everything) I also went to BBB Autoline to file a complaint as I am working with them diligently. The manufacturer still has yet to do anything but try and "diagnose" the vehicle for problems that keep occurring. I am now using the lemon law to fight them! It has clearly gotten out of control with their lies and I am tired of it. I should not pay for a car that does not deliver what is promised and puts me and others in an unsafe, unreliable predicament. I will now be using the Magnuson-Moss Warranty Act under the Texas lemon law to finally put a stop to this. If you do not fight for yourself these companies will continue to deliver poor customer service and promises to a naive consumer who trusts them! It's time to do something about it, and I will!
  • alchipalchip Posts: 14
    So sorry to hear of your troubles. Actually, we really like our LaCrosse. I'm just looking for an affordable way to read my mileage again!
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