Question about 2005 Buick LaCrosse

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Why isn't HVAC on 2005 buick lacrosse not working?

No controls work. Checked all fuses and relays.

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  • 1,511 Answers

Did you have the cars computer brain reset?

Posted on May 10, 2014

Testimonial: "No I did not. I did, however, pull/reinsert all the HVAC system fuses and relays, including BATT 4 main. The system then worked."

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    Dayton Computer May 11, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: how do you add power steering fluid. 2005 buick lacrosse

It is very hard to see, its back and underneath the altenator, use a flashlight to find it buried under wires and tubes.

Posted on May 03, 2009

  • 57 Answers

SOURCE: Air conditioner/heater blower fan on 1997 Buick

it will be hard to diagnose with out having my hands on it but try this.

this vehicle is known for blower motor resistor failure.

under the dash on the passenger side next to the blower motor there is a resistor attatched to the blower motor case it will have a single plug with 5 or 6 wires in it, they are normally within a couple of inches of the blower motor, remove this resistor and look at closely for any signs of burning this is a common problem, you can buy one at any parts house, do not operate the motor with the resistor removed from its mounting hole or you will damage it.

if the resistor looks good than purchase you a test light and drop me a line and i will explain how to test the entire system its not hard to do.

wesleyschacht@hotmail.com

Posted on Jun 14, 2009

  • 192 Answers

SOURCE: lowbeams headlamp won,t work on 2005 buick

Start simple. Investigate your fuses, since it is unlikely, but not unheard of, for both low beams to fail simultaneously.

Do you know where your fuses are?

Posted on Aug 17, 2009

  • 3 Answers

SOURCE: how to install/change complete headlight assembly

Buick Lacrosse - The bright light fitting is the same as the dim so take it apart first to see how the cover screws off/on and the light comes out. Both the cover and the bulb are removed by a standard twist to the counterclockwise and replaced by a twist to the clockwise. Now to the dim light. You have to release the entire light assembly before you can remove the screw-on cover to reach the light. On the rear edge of the light unit closest to the engine is a white locking tab. Pull that tab up just to the point where it releases…pull too far and it locks again. Next, locate the other locking bracket which is a metal bracket in the center-rear of the light assembly. This bracket is held down by a screw. Remove the screw with a 10mm wrench. Lift the bracket just like you did the white bracket. You should now be able to pull (or pry) the entire light unit forward a little. Depending on the size of your hands this might be enough. If not, then you need to release the plastic bumper assembly to give you a little more space. This is done by removing two expansion locking pins, one that holds the little plastic strip down between the bright and dim lights and one that is located inside a rubber bumper on the engine side of the light unit. To remove these locking pins, pull or pry up the little tab in the center of the pin just like you were pulling a nail by the head. That should give you more space.

Posted on Apr 03, 2010

  • 1 Answer

SOURCE: 2007 Buick Lacrosse low beam headlights both went

The relay under the hood may have gone out. We had the same problem on our 2007 Buick LaCrosse CX. The bulbs were fine, high beams worked, all turn signals and everything except the low beams turned on. Turns out the relay had gone bad.

Posted on Sep 07, 2010

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1 Answer

2005 Lacross blower motor question.it has been intermittently working.if i hit the pass. side dash it will come on.now it won't come on at all.


Does your Buick have manual or automatic HVAC system ? It's not a relay , probably the motor ! But testing is the only way to know for sure ! Videos on youtube showing how to troubleshoot . Do you know how to do basic automotive electrical testing ? Videos on youtube on that subject as well . Disconnect wire connector at the blower motor , an jump the blower motor directly . If you have hit it to get to work , the blower motor is bad !

Dec 02, 2016 | 2005 Buick LaCrosse

1 Answer

2005 buick lacross parking lights will not turn off


The park lamp relay contacts are stuck shut ,probably ! Do you know where the rear fuse box is ? Under the back seat . Check the relay first , if that's not the problem then the vehicles BCM maybe at fault .
The body control module (BCM) controls the park lamp relay through the park lamp relay control circuit. The BCM grounds the park lamp relay control circuit which energizes the PK LP relay.

Sep 16, 2016 | 2005 Buick LaCrosse

2 Answers

Where is my hvac fuse located?


There are two fuse boxes on is located under the hood and the other is located on the side of the dash board on the passenger side. The owners manual will help you locate the fuse or relay

Nov 03, 2014 | 2005 Buick LaCrosse

1 Answer

Blower motor not working on 2005 buick lacrosse cxl


Blower operation is handled by the HVAC control module which gets its power from the 10A HVAC fuse in the instrument panel fuse block. There is a blower motor control processor that gets its power from the 30A BATT MAIN 4 fuse in the underhood fuse block. The HVAC control module sends speed signals to the blower motor control processor which turns on the blower motor at the selected speed. Note that there is no relay involved. If you check the fuses and check the path to the blower motor you may find that the motor is OK and the trouble is somewhere else

Oct 15, 2012 | 2005 Buick LaCrosse

1 Answer

MESSAGE CENTER NOT WORKING


Its a fuse/relay problem. Check them and you will most likely see a missing or broken fuse. If all of them are in good shape, get the relay checked and replaced. Its a cheap fix fortunately.

Jan 15, 2011 | 2005 Buick LaCrosse

1 Answer

My 97 buick lesabre limited heater/ac blower quit, it has the climate control,I checked all fuses.


REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.

Dec 02, 2010 | 1997 Buick LeSabre

3 Answers

2007 Buick Lacrosse low beam headlights both went out at once. Doesn't appear to be the bulb. Also checked the fuses under the hood and those both appear OK too.


The relay under the hood may have gone out. We had the same problem on our 2007 Buick LaCrosse CX. The bulbs were fine, high beams worked, all turn signals and everything except the low beams turned on. Turns out the relay had gone bad.

Sep 07, 2010 | 2007 Buick LaCrosse CXL Sedan

1 Answer

2005 buick lacrosse heater fan does't run. checked fuses ,all ok.


Check the main fuses under the hood. and check the hook ups under the dash.

Feb 01, 2010 | 2005 Buick LaCrosse

2 Answers

The low-beam headlights in my 2005 LaCrosse won't work,but high beams do,What would cause this?


there is a relay in the fuse panel located under the hood its called the HDM RELAY # 34 .

Oct 09, 2009 | 2005 Buick LaCrosse

1 Answer

2005 buick lacrosse, Headlights not working.


it seem that all your vehicle have electrical problems. is better to make a electric inpection to the dealer.

Mar 17, 2009 | 2005 Buick LaCrosse

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