Question about 2005 GMC Envoy Xl

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Headlights keep going out on vehicle when the switch is on auto and after a while they will work again can someone tell me if it is a relay or some type of sensor or maybe the switch itself

It has an i6 engine in it and it's 4x4

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C heck the bulb connections and the bulb holders them selves as after time they can get brittle and not give a good contact

Posted on Nov 09, 2014

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SOURCE: headlights keep switching from drive lights to headlights

check the headlight switch for burned contacts or a heat dis-colored connector to it. If u find either replace the headlight switch and the connector as a pair.

Posted on May 14, 2009

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Turn on headlights and switch to high beams and all the dash lights and headlights go out. I replaced the multifunction switch and the headlight switch.


May I humbly suggest you not turn on the high beams again until the problem is repaired?
There is a small danger of fire.
I am suggesting you have either a wire that is shorted out, as might happen because of an automobile accident, or a headlight relay shorted out.
Often those relays are located inside a black plastic box under the hood of the car.
Sharing the year, make, and model of vehicle could cause someone else with a similar vehicle to offer some assistance as well.
God bless your efforts.

Dec 07, 2015 | Cars & Trucks

1 Answer

Headlights wont go on


the headlights are controlled by the switch and a relay. the relay is in the fuse box and can be tested by switching the relay with another of equal amps rating. if replacing the relay does not work the the switch could be bad or the wiring could be at fault. If you are planning to keep the vehicle, I would suggest you purchase a Haynes of Chiltons manual for your vehicle.

Nov 15, 2015 | 2001 Chevrolet Blazer

2 Answers

My headlights will not go off when the switch is in the off position


Year/make model???? Possible daytime running light module shorted out

Oct 03, 2015 | Cars & Trucks

1 Answer

Why won't the headlights turn on?


This vehicle has problems with the multifunction switch AND the hazard light switch. Try turning the switch on and move the hazard light switch back and forth up and down. If that's not it, I'd look at replacing the MFS. There is a TSB on the MFS, but typically for the brake lights not working. Look in this to go over the steps to take to diagnose also.

Sep 30, 2015 | 1999 Chevrolet Blazer

3 Answers

On my 2005 Chevy trailblazer my headlights are automatic, randomly when I'm driving they turn off on my and my high beams still work. I checked the fuses they still work. Can someone please help me?


They are controlled by a photosensor, my subaru legacy does the same thing, switch from running lights to main headlights when in auto mode, if you want to leave the lights on all the time switch out of auto mode

Nov 27, 2014 | Cars & Trucks

1 Answer

Headlight relay located


What year expedition ? The head lamps are controlled by a module (electronic module ) VSM- vehicle security module or SJB - smart junction box on newer expeditions . The module received a input from a shorted switch or light sensor or something of that nature . Having a professional type scan tool hooked up ,checking codes in the GEM or SJB would be the first step . Or you could find wiring diagrams for the inputs to the module , take your vehicle apart an test the circuits with a volt meter . You can find wiring diagrams at www.bbbind.com .

Apr 05, 2017 | Ford Expedition Cars & Trucks

1 Answer

My Mazda RX-8 headlights, lh lowbeam light and taillights work when they want. There's this loud flickering noise that comes from the passenger side of the vehicle and the lights dim or just go out. M


It sounds like your Headlight Relay is starting to go out. You can find the relays in the fuse box under the hood. There will be a diagram on the inside of the cover. When you locate it wright the relay's part number. you might find the same relay in 2 or more places.
Try switching the relays and then try the headlights again.
If this solves the problem just buy a new relay.

If this does not solve the problem start tracing all the ground wires. Mazda's and other foreign have grounding problems that will cause all finds of weird things to happen.
Also, have someone turn the lights on while you listen for the buzzing and see if you can locate it.

Dec 16, 2012 | Cars & Trucks

1 Answer

I have a 2003 Ford Explorer Sport Trac. My automatic headlights and auto dimming review mirror are not working. No fuses inside the cab of the truck are blown and dont know which ones under the hood...


The autolamp system, controlled by the vehicle security module, supplies voltage to the same circuits used by the headlamp switch to power the exterior lamps when low light conditions are detected.
Anyone else have or have fixed this problem some help please???? What fixed someone else's vehicle probably won't fix your's .Electronic's involved . Using service repair info. , wiring diagram's an testing the electrical circuits is how professional Technician's fix electrical system problems , not guessing or looking for magical fixes on web sites or forum's.
Visual Inspection Chart Mechanical Electrical
  • Headlamp switch
  • Battery junction box (BJB) fuses:
    • 1 (60A)
    • 16 (15A)
    • 22 (20A)
  • Central junction box (CJB) fuse 20 (5A)
  • Circuitry
  • Photocell sensor
  • Vehicle security module

Plus hooking up a factory scan tool an checking for DTC'S - diagnostic trouble code's .
Vehicle Security Module Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1695 Autolamp On Circuit Failure Vehicle Security Module Go To Pinpoint Test J . B1792 Autolamp Sensor Input Circuit Short to Battery or Open Vehicle Security Module Go To Pinpoint Test J . B1793 Autolamp Sensor Input Circuit Short to Ground Vehicle Security Module Go To Pinpoint Test J . B2661 Parklamp Relay Output Short to Vbatt Vehicle Security Module Go To Pinpoint Test R . B2662 Parklamp Relay Output Open Circuit Vehicle Security Module Go To Pinpoint Test I . B2663 Headlamp Relay Output Short to Vbatt Vehicle Security Module Go To Pinpoint Test F . B2664 Headlamp Relay Output Open Circuit or Short to Vbatt Vehicle Security Module Go To Pinpoint Test H . Symptom Chart Condition Possible Sources Action
  • No communication with the vehicle security module
  • Circuitry.
  • Vehicle security module.
  • REFER to Section 418-00 .
  • The autolamps are inoperative
  • Circuitry.
  • Headlamp switch.
  • Photocell sensor.
  • Vehicle security module.
  • Go To Pinpoint Test G .

Electric Testing Techniques You Need to Know

Sep 19, 2017 | 2003 Ford Explorer Sport Trac

1 Answer

I have been having some problems with my headlights not running properly. The automatic headlights don't go on automatically anymore and now when I try to turn on the lights manually that doesn't always...


there is a relay under the hood in the fuse/relay panel called drl, or daytime running lamps, that relay is most likely bad, a good way to tell is switch it with the high beam relay, if they come on you know thats it, if they dont, its the relay for the lowbeams, again switch it with the high beam relay and see.. either way i can tell you for sure one of those two are bad... but most of the time it is the daytime running lamps, or sometimes called driving lights relay. hope this helps you

Dec 03, 2010 | 1999 Buick Century

3 Answers

96 Dodge Ram 1500 wiring diagram for headlights.


Here's a link to a pdf file containing the headlight wiring diagram for your year model Dodge Ram 1500..
I can't help but notice that you say you've replaced the headlight relay? That's quite odd, because there is NO headlight relay on this vehicle- only a 40 amp fuse located in the power distribution box that sits behind the battery inside the engine bay.
The switch is notorious for burning out because there is NO RELAY on this vehicle, and there is a recall (#819) but this only affects 3500 models even though the headlight wiring is the same for 1500,2500 and 3500 model Rams.
Here are two more links that will help you troubleshoot your headlights problems.
HereInformation on Putting a Relay in the Wiring System

Mar 07, 2009 | 1996 Dodge Ram 1500 Club Cab

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