Question about 2004 GMC Yukon

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Low beams not working, right side low beam is dim, high beams only left side comes on

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  • Alex Hernandez
    Alex Hernandez Apr 12, 2015

    thanks I'll try those option, I really appreciate it

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If it comes on dim sounds like a ground issue check the harness from the bulb harness to firewall radiator support see if ground is clean wire is not split or corroded

Posted on Apr 13, 2015

Testimonial: "Thanks, it was a ground problem, I found a loose wire,and now the lights work,thanks so much"

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Look like you got a ground problem

Posted on Apr 13, 2015

  • Alex Hernandez
    Alex Hernandez Apr 14, 2015

    thanks for the great info, it actually was a ground problem, found the issue now the lights work thanks so much for the info I'm greatly appreciated

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Always check easy things first. 1. Check and replace all bulbs especially if old. 2. Check under hood for bad fuse. 3. Use test metrometer to ensure power to fuse connection. There are inexpensive testing meter lights available. Wires to lights can melt coating over time and you may need replacements. If fuses, wires and bulbs are good, then change headlight switch or wire to the headlight has gone bad. Use a voltmeter to test headlight plug.
If this does not work, try using a voltmeter on the plug for the bad headlight. Turn on the ignition, and turn the headlight switch. If the voltmeter shows no voltage, then either your switch or the wiring leading to the headlight has gone bad

Posted on Apr 11, 2015

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  • 36 Answers

I'd replace the bulb first, if the filaments break and touch each other the right way, you'll get this problem. ..if that doesn't do it, I'd suspect the relay module, switch it out with the fan module like the guy said...if that's not it, then you're looking at a bad ground or the switch itself...oh yeah, make sure your fingers do not touch the bulb, it runs too hot and fingerprint oil will crack the glass...

Posted on Apr 15, 2015

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 2003 GMC Envoy low beam head lights will not come

The problem is a Headlight module. Fuse box under the hood has two black modules side by side, the one on your right is the headlight module the one on the left is the fan module. Try swapping them, if the headlights work replace bad module, don't drive vehicle with the bad module in the fan slot. Mine kept going bad because I had a high intensity bulb on one side.

Posted on Sep 17, 2012

  • 1311 Answers

SOURCE: Headlamps won't come on 2004 GMC Envoy...High

Check Relay #46 in underhood fuse panel.

Posted on Dec 19, 2010

  • 564 Answers

SOURCE: Low beams don't work; High beams fine. Not the

some have fuse under hood for high beams & low beams,,if ok,,u mite need a high & low beam switch,,,,

Posted on May 24, 2010

miket756
  • 2702 Answers

SOURCE: daytime running lights work daytime/no low beam at

its likley to be the head light censor

Posted on Oct 24, 2009

  • 153 Answers

SOURCE: I have a 2006 Envoy. My high beams come on, but

theres a chance both of the low beam bulbs went out pretty close to the same time. if you have a test light check to see if you have power at the bulb connector with the lights turnd on

Posted on Oct 01, 2009

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1 Answer

Why wont the headights or running lights work on my 2002 Buick LaSabre?


There are several reasons why your headlamps an running lights don't work , the headlamp switch is a good one ,plus relays an the DIM - dash integrated module an associated wiring ! Here is how the headlamps work , right out of Buick factory service info !
The dash integration module (DIM) provides battery positive voltage to the signal circuits of the headlamp switch. The signal circuits include the headlamp switch headlamps on signal, the flash to pass switch signal and the high beam input. With the headlamp switch in the ON position, a ground path is available for the headlamp switch headlamps on signal circuit of the DIM through the headlamp switch. The DIM provides ground to either the headlamps high beam relay control circuit or the headlamps low beam relay control circuit of the low beam circuit. The position of the headlamp dimmer switch determines which relay control circuit has ground. The DIM supplies battery positive voltage to the relay control circuits, if the headlamps are necessary. The fuse block - underhood supplies battery positive voltage to both relay switch circuits. When the low beam relay control circuit is energized, current flow is to both low beam fuses and to the low beam headlamps. The headlamps have ground at G103 and at G401. When the headlamp high beam relay control circuit is energized, current flow is to both high beam fuses and to the high beam headlamps. The high beam circuit is divided into a left and right side circuit. The current flow of the left high beam is from the fuse to the left high beam lamp. From the lamp, the current flows to the normally-closed contact of the DRL relay to G103. The current flow of the right high beam is from the fuse to the right high beam lamp. From the lamp, the current flow is to ground at G401. When the headlamp dimmer switch lever is pulled toward the driver, the flash-to-pass switch closes. This grounds the DIM flash to pass switch signal circuit. In response to this input, the DIM energizes the HDLP HI BM relay. Both high beams remain on until the driver releases the switch handle. If the low beam headlamps were on during a flash to pass operation, the low beams remain on. The headlights may be switched to high beam with the opposite movement of the headlamp dimmer switch lever.
By running lights , do you mean park lamps or day time running lamps ?
Park, Tail, License and Marker Lamps
The park lamps, including the license lamps, are turned on when the headlamp switch is placed in the PARK or ON position or anytime the headlights are requested. The fuse block - rear supplies battery positive voltage to the switch contacts of the Park LP relay. When the headlamp switch is in PARK or in ON, the park lamp switch on signal circuit of the DIM has a ground path. The DIM provides battery positive voltage to the control circuit of the Park LP relay. When the park lamps and/or the tail lamps are ON, the DIM energizes the park lamp relay control circuit. This closes the switch contacts. Current flows from the Park LP relay to the LH PARK LP and the RH PARK LP fuses. From the fuse, the current flows to the park lamps. The left park lamps are grounded at G103, G401 and G402. The right park lamps and the right tail lamps are grounded at G103 and G401. The DIMR fuse supplies battery positive voltage to the license lamps and to the DIM instrument panel lamp fuse supply voltage - 1 circuit, for interior lamps dimming. The license lamps are grounded at G401.
The best advice I can give is that you take this to a ASE certified professional repair facility unless your a qualified automotive electric repair person !
Diagnostic Starting Point - Lighting Systems
Begin the system diagnosis with the Diagnostic System Check - Lighting Systems . The Diagnostic System Check will provide the following information:
?€¢
The identification of the control modules which command the system


?€¢
The ability of the control modules to communicate through the serial data circuit


?€¢
The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

The

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1 Answer

Left headlights


Check your connections at the wiring harness going to headlights for corrosion, sounds like high resistance somewhere, also make sure your ground wires are secure. It wouldn't be the alternator or the battery would be dead and not start the engine. Also shouldn't be any condensation in your head light assembly's or will cause bulbs to blow prematurely.

Feb 22, 2014 | 2002 Subaru Outback

1 Answer

I have a 2008 f250. one headlight (driverside) low beam is not working. I have checked both fuses 10amp and they are good. The flash to pass works and both lights on bright, right and left come on. the...


I am sure that a 12 Volt bulb means it needs 12 Volts. Since you changed the bulb to the other side, why not check the voltage in the working side and see what it reads?

Sometimes the turnstalk can interfere with the lighting. Try pushing the Hazard switch several times and see if the headlights straighten out. I read that too much goes through the turnstalk and that using the Hazards can derail a contact inside the stalk.

If this does not help, you may need a headlight relay in the powerbox. One contact may be dirty or burned down for the wire it feeds. Unless you have a single wire feeding both low beams to the headlights, I would bet the left and right side come out directly through the relay.

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1 Answer

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Power for the headlights on the Left side (High and low beam.) comes from the same fuse... The ORANGE wire and the ORANGE/BLACK are the same, they connect in the harness. If you only lack the 12v to make the light work connect them at the headlight assembly.

If your low beam also lacks ground the Left low beam ground is shared with the right low beam ground... Run a wire from left low beam DARK BLUE to right low beam DARK BLUE/WHITE.

If its not working now then your cursed, seek a witch doctor.

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2 Answers

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Check the fuse for the passenger side.It is under the hood. it may not be making good contact. wiggle it a little bit and see if it makes any difference. if not, check where the the ground wires are connected to the chasis. See if thats not the problem.

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1 Answer

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The mechanic didn't hook up the ground wire. The system is using the other light as it's ground and when this happens it causes the other light to go out.

Check the ground wires

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