Question about 1999 Buick Century

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99 buick centry head lites wont work no daytime lites and if you hold turn signal switch high beams work but dont stay on low beams will flash when moving from high to low

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U need to replace the multi-funcition switch in the steering colum...hope it helps

Posted on Nov 18, 2010


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Low beam headlights do not work 2010 chevy impala high beams work as do daytime running lights low beams do not work on either automatic mode or manual mode

The headlamps are controlled by the BCM - body control module , do you know what that is ? The headlamp switch is a input to the BCM ,the BCM energizes relays to turn on the headlmps , low beam relay , high beam relay , DRL relay . These relay's are PCB - printed circuit board relay's ( non - serviceable ) If found to be bad the whole under hood fuse box would need to be replaced .
Low Beam Headlamp Operation
The low beam headlamps may be turned ON in 3 different ways:
• When the headlamp switch in the HEAD position for normal operations
• When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)
• When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay
Battery voltage is applied at all times to the coil and switch sides of the LOW BEAM PCB Relay located in the underhood fuse block. When the headlamp switch is placed in the HEAD position, ground from G202 is applied through headlamps ON switch signal circuit to the body control module (BCM), signaling the headlamps ON request. In response to this signal, the BCM applies ground through the headlamp low beam relay control circuit energizing the low beam relay. With the relay energized, battery voltage is applied through the switch side of the relay, the left and right low beam fuses, and the low beam supply voltage circuits illuminating the low beam headlamps. Ground for the left headlamp is provided at G101 and the right headlamp at G100.

Do you know what B codes are ? BCM - DTC'S - diagnostic trouble codes , need a factory scanner or professional one to view these codes , not autozone or advance etc....Having a qualified repair shop check your vehicle would be your best bet.

DTC B2575 00: Headlamp Control Circuit

Circuit/System Description
The vehicle headlamps are controlled by the body control module (BCM) based on inputs from the headlamp switch and the turn signal/multifunction switch. The headlamp switch has four positions: Off, Auto, Park, and Headlamps. The default headlamp switch position is Auto, in which the BCM uses the ambient light sensor to determine when headlamps are needed. The Off portion of the headlamp switch is a momentary switch which overrides the automatic headlamps and will turn off the vehicle headlamps. When in the Off position, the headlamp switch grounds the headlamp switch headlamps off signal circuit, prompting the BCM to turn off the headlamps. The Park position of the headlamp switch will only illuminate the vehicle parking lamps. The Headlamp position of the headlamp switch will illuminate both the parking lamps, as well has the headlamps. With the headlamp switch in the Headlamp position, the headlamp switch headlamps on signal circuit is grounded, prompting the BCM to turn on the headlamps, regardless of other factors such as ambient light.
The headlamp high beams are controlled through the flash to pass switch and the headlamp dimmer switch, both located in the turn signal/multifunction switch. The flash to pass switch is a momentary type switch, designed to illuminate the high beams as long as the switch is held. With the switch closed, the flash to pass switch signal circuit is grounded, prompting the BCM to turn on the high beam lamps. The headlamp dimmer switch allows the operator to select between full time high or low beam operation. Unlike the flash to pass switch, it is not a momentary switch. When the headlamp dimmer switch is in the high beam position, the headlamp dimmer switch high beam signal circuit is grounded. This prompts the BCM to turn on the high beam lamps.
The BCM controls the headlamps based on the inputs explained above. When a low beam request is received, the BCM grounds the headlamp low beam relay control circuit. This energizes the coil in the LOW BEAM PCB relay, causing the relay switch to close. This then applies B+ to both low beam headlamps through the LT LO BEAM and RT LO BEAM fuses, illuminating the low beam headlamps. When a high beam request is received, the BCM grounds the headlamp high beam relay control circuit. This energizes the coil in the HIGH BEAM PCB relay, causing the relay switch to close. This then applies B+ to both high beam headlamps through the LT HI BEAM and RT HI BEAM fuses, illuminating the high beam headlamps

Mar 12, 2018 | Cars & Trucks

1 Answer

Head Lamps ON my 2000 Buick LeSabre quit working - Brites only work IF I hold Lever in , ALL other Lites work. ALL Fuses n Relays good Should I replace Lamp switch ?

Hi Ricky, Im AL the owner of Big As Auto Repair.

Ricky, if the high beams work when you hold the lever in, then its the high beam switch NOT the light switch. The lever controls the high and low beams. You need the multi-function switch which is also the dimmer switch. Hope this helps and please visit my auto-repair-website at:

Nov 30, 2015 | Buick Cars & Trucks

1 Answer

2005 buick lesabre low beams not working at night daytime running lights work hi beams work dimmer switch works relays and fuses are good. what do I check now and how?

It's the dimmer switch. Which is called the multifunction switch or turn signal switch. Just because it clicks, doesn't mean the it is working properly. If you click and the high beams come on, then click it again and have no low beams, replace the switch. Daytime running lights are controlled by the Body control module.

Oct 16, 2014 | 2005 Buick LeSabre

1 Answer

2006 buick lacrosse low beams not working high beams only is i hold in the turn signal

this sounds like a bad dimmer switch not functioning. I would first check to make sure the rod that runs from the lever to the dimmer switch is traveling the complete length and is not out of adjustment.

Sep 28, 2014 | 2006 Buick LaCrosse

1 Answer

99 S10 high beams work, but low beams don't.

Do you have power in and out of the dimmer switch in the low beam position ?

Feb 15, 2014 | 1999 Chevrolet S-10 Pickup

1 Answer

Is Blue Lite For High Beam Supposed T oStay on when clicked?

To clarify, when you pull the turn signal lever towards you, the high beam lights will come on only as long as you hold the lever up. This is the flash to pass feature.
To switch the headlights from low beam to high beam, you push down on the lever towards the dash. Then the high beam lights and the blue indicator light should stay on.

Jun 09, 2013 | Cars & Trucks

1 Answer

My daytime running lights work, high beams will come on but switch wont stay on, have to hold it. Low beams do not work and daytime running light dash indicator stays on all the time. Is it a relay or...

if you have to hold the switch so the high beams stay on then that indicates a bad/worn switch,you could have 2 problems the day time running light relay may have a problem with it.i would first replace the headlight switch at the base of the steering colume as by the info you supply its not changing to the high beam side without holding the switch in position.

May 25, 2011 | 1998 Pontiac Sunfire

2 Answers

My truck is actually a '95 C1500 but I understand that they were the same model from 88-98. I have 2 problems - both electrical. On a recent trip, I lost both low beam headlights at the same time. ...

There could be a fuse for each low beam light either under the hood or under the dash. If not, then prob both low beams are bad.

If you have daytime run lights, the following may be of help.

There is a daytime running light module that controls both low beams and the daytime running lights. The low beam bulbs may be OK. The high beams will work fine as they are not controlled through the module.

It may be possible to disable the daytime run lights by cutting the yellow wire going into the module and then connecting it to ground. Tape off the other end.

This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya

Mar 03, 2010 | 1998 Chevrolet C1500

2 Answers

97 buick headlights go out

where is the relay headlight switch located on a 1998 buick century

Oct 31, 2008 | 1998 Buick Century

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