Question about 2003 Chevrolet TrailBlazer

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My headlights are not working I check the fuse it seems to be in good condition and all other light work I have replace the lamps with new and the headlights still don't work what else can I do?

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CHECK HEADLAMP DRIVER MODULE RELAY OR THE HEADLAMP HI BEAM RELAY IN THE FUSE BOX UNDER THE HOOD FUSE BOX.

Posted on Jul 20, 2010

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Posted on Jan 02, 2017

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I need clarification on 2003 Chev Malibu DRL problems:


That piece you think is a ceramic DRL module is a resistor , When in DRL mode voltage to the low beam headlamps circuit goes through that resistor dimming the headlamps from low beam to daytime running lamps . It sounds to me like you need a new resistor ,but without doing some electrical testing it could be a lot of things . The DRL relay in the under hood fuse box could have a problem , could be the BCM - body control module , the ambient light sensor etc... Here is how daytime running lamps work .
Daytime Running Lamps (DRL)
The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level. When the BCM receives this signal it will either turn on the daytime running lights (DRL) or the headlights. Any function or condition that turns on the headlights will cancel the daytime running lamps operation. With the headlight switch in the OFF position, the headlights will either be turned ON or OFF, after an approximate 30 second delay depending on whether daylight or low light conditions are sensed. The HTR A/C IGN fuse in the underhood junction block supplies ignition positive voltage to the daytime running lamp (DRL) relay coil circuit. The DRL relay switch contacts are connected to the low beam circuit. When the headlamp switch is placed in the OFF position, the BCM will either turn on or off the daytime running lamps, depending on whether daylight or low light conditions are sensed. The BCM energizes the DRL relay, closing the switch contacts and grounding the low beam circuit. Ground is provided at G101. The DRL illuminate the low beam headlights at a reduced intensity. The DRL will operate when the ignition switch is in the ON position, the gear selector is not in the PARK position and the parking brake is released. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate.

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Help Only one headlight working


It could be a broken wire on the wire harness or a bad fuse.

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Wiring diagram headlights


It sure sounds like a bad ground Doug.

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Fiat punto headlight not working


check the condition of the fuse there are fuses one for left and one for right side they are independant as if one light goes you dont want both going while driving. the fuse may look good but it probably is not a a hair line crack will stop power from going to the light.

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I have a 2003 GMC Envoy XL and the driver's side front parking and marker lights don't work although the signal light does. Both of the marker lights were blown and one of the prones in the parking lamp...


If you have a test light, you can check for power at the light sockets and connectors. If you have power, you can connect the alligator clip on the test light to the positive side of the battery and test for a faulty ground...Good luck!

Mar 14, 2011 | GMC Envoy XL Cars & Trucks

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My headlight wont work


If it is only one bulb out... get a new bulb or use the other bulb to check it. if it is both lights... you will have to use a multimeter and check for current at the bulb harness, headlight relay, switch. if it has pwer going in but none going out you found your broken part.

Dec 22, 2010 | 1998 Chevrolet Suburban

1 Answer

Low beam dosent work. bulb is good highbeam works cant find fuse for lights. its not underhood


Hi,
It has been because the lamp bulb or halogen lamp module has reached the end of its serviceable life, not because of any wiring problems. Low beam burns out first because it is on the most. If low beam is lost simultaneously in both headlights, I would check fuse first, then the headlight switch. If low beam is lost on one side only, it is almost always going to be due to the bulb or lamp module needing to be replaced. In that case, replace them in both headlights because the other one will be going kaput in short order, as well.
Most like the low beam filiment is bad but the high beam filiment is still good, try replacing bulb. If replacing bulb does not fix problem then you probably have voltage problems and should check the voltage reading and the plug.
OR
isolate the wire that comes from the headlight switch to the headlamp bulbs for low beam and check to see if there is a short in the wire. You can find this wire by using a test light turn on the key and get a good ground with the test light poke the wire and see if the test light illunimates with the headlight switch on.
check the wires, and check the fuse for your lowbeams. could of blown a fuse on your lows, but your highs will still work.

The fuse box is located in the engine compartment,on the driver's side. Has thumb-screw retained cover.
Thanks for contacting fixya.com

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Low beam headlights not working on 2004 Pontiac Montana extended


You headlight lamp have a diffuser mechanism which allows it to flip between the hight beam and low beam feature of the bulb. In fact, you high beam will function even if the low beam is not working.

I would recommend the purchase of the new headlight lamp. It would cost you you any where from $15.00 per unit to get a replacement lamp

Dec 26, 2008 | 2004 Pontiac Montana

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