Question about 2004 Chevrolet TrailBlazer

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Replaced left headlamp (3rd time) still will not come on

Replaced relay last year, could this be problem again?

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  • Anonymous Apr 04, 2009

    I have replace both headlight bulbs in my 03 trailblazer 3 times. The boot that it inserts into has melted each time.

    I have heard of other people having this problem with trailblazers


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Of course it could, the relays only last so long and some times the store bought ones last less time than the ones bought from the dealer.

Posted on Nov 26, 2008

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96 Mercury Sable headlights won't turn on. Bulbs replaced. Fuses check. Relay replaced. Headlight switch replaced. Pulling the multifunction stick on steering column offers high beams only.

If all the items you listed were replaced then you have either a ground breach where no ground is reaching the negative post of the headlamps or there is no power source connection. Start with verifying power to the headlamp switch. If yes, verify power from the relay. If yes, verify power to the terminal at the headlamp. If yes, start with the ground circuit. If there is no ground connection you can save years of frustration by fabricating a new ground circuit from the body to the headlamp ground terminal. I'm going o get frowned upon for that but, hey, if it works for the time being, right?

Oct 23, 2016 | 1996 Mercury Sable

1 Answer

Headlight 2006 Colorado do not work high or low beams

I saw what you replaced. Did you do any testing, first? Anything electrical, always check voltage and ground for the component. Use a testlight.

There are right and left headlamp fuses in under hood fuse box. I doubt the fuses blew, but, you can check voltage at fuse circuit with headlamps on.
I don't know if there would be any applicable codes for headlamp system? You can check.
Your bcm has some control over headlamps.

Dec 13, 2015 | 2006 Chevrolet Colorado

1 Answer

Were is headlight low beam relay

It is located in the under hood fuse/relay box . It's non -replaceable ,if bad whole fuse box has to be replaced ! 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.
Low Beam Relay Test

  1. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
  2. Connect a test lamp between the control circuit terminal A5 and B+.
  3. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  4. ?‡'
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  5. If all circuits test normal, replace the underhood fuse block.
  6. Ignition OFF, disconnect the harness connector at the inoperative low beam headlamp. Test for less than 5.0 ohms between the ground circuit terminal B and ground.
    If greater than the specified range, test the ground circuit for an open/high resistance.

    Connect a test lamp between the supply voltage circuit terminal A and ground. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.

    If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.

    If all circuits test normal, test or replace the low beam headlamp.

Jun 10, 2015 | 2006 Chevrolet Chevrolet Impala LS

1 Answer

The dark interstate late at night is not the time to loose your headlights. I checked the fuses and the bulbs. Last time this happened, which was about 2 years ago, I had to have the day runner sensor...

Swap relay #45 & 46 in the underhood fuse panel. Relay #46 is for the low beams, #45 is for fan clutch. If this does not cure it, did you try setting the headlight switch to the Headlamps position? Make sure you checked the correct fuse as well, it is #6 in the underhood fuse panel.

Sep 20, 2011 | 2004 GMC Envoy

3 Answers

I have a 2006 ford escape and the passenger head light low beam will not work. Tried replacing the bulb, and check fuses nothing is working.. what else can I try?

Both your low beam and your high beam is protected by the same fuse, so it makes sense that the fuse is OK if the high beam is working on the passenger side. There are 3 fuses for the headlamps. Fuse #13 in the Battery Junction Box (20 Amp). If this fuse is blown, the headlamp relay will not have any power and neither high nor low beam on either side will work (you will have no headlamps at all) Then there is Fuses #2 and #3 (15 Amp) in the Battery Junction Box. #2 goes to the left low and high beam and #3 goes to the right low and high beam.
The headlamp switch uses a SINGLE CIRCUIT to control BOTH sides at the same time, so if one side works, the switch cannot be the problem. The headlamp relay provides power for fuses #2 and #3 and we already ascertained that these fuses must have power since we have working lights on both sides, so the relay cannot be the problem. A replacement bulb has already been tried, so that pretty much leaves us with a bad lamp socket. (Most likely cause) or a bad connection at splice #S122, which is located in the main wiring harness near the breakout for the left headlamp. (RED/BLACK wire)

May 16, 2011 | 2003 Ford Escape

1 Answer

I have a new headlight relay for my 1997 volvo 960 and I have located the relay panel, however, there is no relay to be replaced. Where is the headlight relay supposed to be located?

The headlamp relay is located under the dash to the left of the steering wheel. If it is the original relay, it will say "headlamp relay" on the side of it.

Jul 01, 2010 | 1997 Volvo 960

1 Answer

1996 Dodge ram 2500. Both dashboard lights and headlights went out at the same time. All other electrics work. All fuses seem to be good. What would cause this and how do I fix it?

Both the dash lights and headlamps, including the tail lights are fed through a fuse link under the bonnet, then the tail, dash lights are run through fuses as are the headlamps. Firstly, check the fuses electrically not visually. Use a test probe (available from your local auto parts shop, not expensive) and clip one end to a good ground on the vehicle chassis and use the pointy end to check both ends of each fuse, the test lamp should light up on BOTH ends. If it lights up on one end only, then that fuse has failed and should be replaced. If it does not light up at either end of the fuse, that circuit is without power so turn on the ignition and lights but DO NOT start the motor. Then check the fuses again. If all looks good, locate the light relays which could be under the hood in their own enclosure or plugged in under the dash and check each one for inputs and outputs. If the relay pins are numbered, you should have power to pins 85 OR 86 but not both and 30. Pins 85 and 86 are the coil connections and a power supply and ground connection to these pins should turn the relay on (you should hear a click) pin 30 is the main load supply and pin 87 is the output supply. This means that pin 87 should be active whenever the relay is turned on. power missing from pin 30, check fuses and fuse links. Power at pin 30 but not at pin 87 when the relay is on, replace the relay. Essentially, the light switch turns on the relay and the relay switches the power to the lights, one relay for dash and tail and two relays for the headlamps (high and low beam). You may find that the vehicle has two headlamp relays for each side headlamps, a high and low beam for the right side lights and the same for the left. If you have no power to one of the switching connections (85 and 86) then again check fuses and check the light switch itself.

Jan 10, 2010 | 1996 Dodge Ram 2500 Club Cab

1 Answer

1997 Mercury villager left headlight doesn't work.

go here. we can help you. Also, did you check the headlamp relay in the box under the hood? One relay is in box in front of battery, other is in narrow box along passenger side fender under the hood. swap left & rt headlamp relays to see if it changes.

Jul 13, 2009 | 1995 Mercury Villager

1 Answer

1997 Ford Aspire Low/High beam headlamps not working

---------- HEADLAMPS Condition Possible Source Action
  • Headlamps Inoperative
  • Fuse.
  • Headlamp relay.
  • Circuit.
  • Multi-function switch.
  • Headlamp bulbs.
  • GO to Pinpoint Test A1 .

Headlamp Relay
  1. Key OFF.
  1. Remove the headlamp relay.
  1. Using a jumper, connect terminal C159-1 and terminal C159-2 on the headlamp relay to the battery positive terminal

    Pin Number Circuit Circuit Function C159-1 7C (R) Hot At All Times C159-2 7B (R) Hot At All Times C159-3 12 (R/GN) Multi-function Switch Input C159-4 11 (R/BL) Multi-function Switch Control

Feb 19, 2009 | 1997 Ford Aspire

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