Question about 2006 GMC Sierra

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Headlamps for a 2006 gmc sierra aren' t working

The headlights all of a sudden arent working unless you turn the dash dimmer light off, then you hear a noise outside the truck, and the lights come one. Neither the high or low work, then when they come on with the dimmer switch being turned down inside, there is no high beam or low beam, just one. 10a fuses were good for low

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  • Anonymous Mar 21, 2014

    vehicle has high beam headlights but lowbeam lights will not burn fuses are good

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  • 372 Answers

I would try replacing headlight switch....

Posted on Aug 18, 2008

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99 GMC Sierra headlights & running lights won't work!


Headlights Circuit Description
The headlights are controlled by the body control module (BCM) via the AHL Relay when the headlamp and panel dimmer switch is the AUTO position. When in the AUTO mode, the BCM receives a signal, (voltage) from the ambient light sensor, based on the voltage of the signal of n the sensor the BCM turns the day time running lamp (DRL) lights OFF and the headlights ON. The headlights can also be turned on by placing the headlamp and panel dimmer switch in the head position.
The relay coil is fed by the headlamp and panel dimmer switch or the BCM and the battery B+ buss bar in the underhood bussed electrical center (UBEC). The BCM supplies current to the relay based on the input from the ambient light sensor via CKT 352.
The relay output feeds the LT HDLP and RT HDLP fuses to supply current to the low and high beam lamps on CKT 1340 and CKT 1240. The ground for both the low and high beam lamps is supplied via CKT 524 and CKT 525 to the dimmer switch. The dimmer switch uses CKT 1850 for a ground to G203.
Some circuits are monitored by the BCM, and upon failure may set a DTC.
Park/Side Marker and Tail Lamps
The park/side marker and tail lamps are split between the following 4 fuses:
?€¢
The FR PRK


?€¢
The LR PRK


?€¢
The RR PRK


?€¢
The TRL PRK

These fuses receive voltage from the park lamp relay. When the headlamp and panel dimmer switch is in the auto position, the body control module (BCM) controls the relay by grounding CKT 1080 based on the input of the ambient light sensor. The park LPS fuse supplies battery positive voltage (B+) to the relay at all times.
When the headlamp and panel dimmer switch is in the PARK position, the relay is by passed through the INT PRK fuse. Current flows from the PARK LPS fuse through the headlamp and panel dimmer switch to the INT PRK fuse in order to feed the following fuses:
?€¢
The FR PRK


?€¢
The LR PRK


?€¢
The RR PRK


?€¢
The TRL PRK


Park Lamps Inoperative

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition OFF.
  2. Connect a scan tool.
  3. Turn the ignition to the ON position.
  4. Using the scan tool, check for any DTCs in the body control module (BCM).

Does the scan tool show any DTCs ?
--
Go to Diagnostic System Check - Body Control System in Body Control System
Go to Step 2

2

  1. Turn the headlamp switch to the park position.
  2. Connect a test lamp from (back probe) terminal B of the headlamp and panel dimmer switch to ground.

Does the test lamp light?
--
Go to Step 4
Go to Step 3

3

Locate and repair the open in CKT 240 (ORN) between the switch and the mid bussed electrical center (MBEC).

Is the repair complete?
--
System OK
--

4

Connect a test lamp from (back probe) terminal A of the headlamp and panel dimmer switch to ground.

Does the test lamp light?
--
Go to Step 6
Go to Step 5

5

Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .

Is the repair complete?
--
System OK
--

6

Connect a test lamp from the INT PRK fuse, located in the left bussed electrical center (LBEC), to ground.

Does the test lamp light?
--
Go to Step 7
Go to Step 8

7

Locate and repair the open in CKT 74 (LT BLU) between the MBEC and the UBEC.

Is the repair complete?
--
System OK
--

8

Locate and repair the open in CKT 74 (LT BLU) between the headlamp and the panel dimmer switch and the LBEC.

Is the repair complete?
--
System OK

Aug 11, 2016 | GMC Sierra Cars & Trucks

1 Answer

2003 GMC Sierra 2500HD dash lights not working


Hello! It's unusual to lose just the instrument panel illumination and nothing else...Check the IPC/DIC Fuse (10A) in the under hood fuse box...If it is OK...The +5 volt reference supply from the Body Control Module which supplies the instrument illumination is suspect...It can easily be checked at the Headlamp Switch Dimming Control...Pry the switch out using a thin blade screw driver...Wrap a piece of tape over the tip...The three wires you are interested in are Gray...Gray/Black And Orange/Black on the dimmer switch...Set a voltmeter to read 5 volts...Clip the (+) probe on the Orange/Black wire and the (-) probe on the Gray/Black...Turn on the key...You should read around 2.5 volts (depending on the dimmer position)...Rotate the dimmer control and the voltage should rise to 4.5 volts at max...If you read 0 volts move the (+) probe to the Gray wire...You should read +5 volts...If there is +5 on the Gray and 0 on the Orange/Black the Dimmer Switch is defective and is the cause of the fault...Record readings and send a comment...I'll take it from there....Guru....Saailer

Oct 25, 2011 | 2003 GMC Sierra 2500HD

2 Answers

My 2002 gmc Sierra's low beams will not work but my drl high beams and fogs work fine....


check your headlamp switch.is your switch on the dash or part of the turn signal switch.gm have a thing with plastic switches and metal contacts these switchs have a tendency to melt..also check for grounds.was the vehicle in a accident involving the front end.if you changed your headlamps to 80/100 watts bulbs.the circuit breaker may not work hence the switch melts.

Jun 23, 2010 | Cars & Trucks

1 Answer

I have a 2002 GMC sierra 1500. Instrument Lights Not Working


When dash lights don't work odds are the tail lights don't work either.Sounds like Dimmer switch may be a problem.

Oct 02, 2009 | 2002 GMC Sierra 1500

1 Answer

Dash lights go off intermittently


I'm no expert, I recently purchased a 2003 vibe. I noticed the automatic headlight's sensors can be super-sensitive, about an hour hours before dusk they'll kick my headlights on (when the sun is still shining!), or sometimes when I go into an underpass, and then sometimes they'll realize it's light enough and turn themselves off. This would cause your dash lights to go to the 'headlights on' mode and turn the headlamp signal on, the intensity is controlled by the dimmer/dome light control on the left side of the dash. Check to see if the dimmer is down too far, as this could cause the lights to dim when the automatic headlights turn on. It's also possible that the dimmer is not working, thus no power is getting to the dash lights through the dimmer. Try testing it by starting the car in daylight, then manually turn on the headlights, then adjust the dimmer. Like I say, I'm no expert, just guessing because I've noticed it happen similarly on my Vibe, but my dimmer was at half-way, as I like it for night driving. Someday, I'd like to disable the automatic sensors and DRL.

Jun 04, 2009 | 2003 Pontiac Vibe

2 Answers

How to replace a brake light switch for a 1989 sierra gmc 1500 pick up truck


Look up under dash where brake pedal pivots, you should see a switch that is activated by pedal arm.

Mar 07, 2009 | 1989 GMC Sierra

1 Answer

Day time running lamps


The day time running lamps are your headlights, the parking lights also conventionally known as the running lights serve no purpose during daylight hours and as such are not necessary in the daytime, and are not illuminated by the DRL module. The DRL (Daytime Running Lights) module illuminates the headlamps in a slightly dimmer state than night time dim headlamps, but does not turn on the conventional running lights. The only way you'll get conventional running lights during the day is to turn them on manually. I just reviewed the wiring schematics for that system, and the DRL relay bypasses the dimmer switch when active and prevents high beam operation, and feeds current directly to the low beam headlights, there is no connection to the parking light circuit from the DRL module wiring.

Nov 01, 2008 | 2000 GMC Sierra

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