Question about 2004 Chevrolet TrailBlazer

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Headlights (low beams) will not work

My lowbeams on both sides do not come on. All other lights work. I checked the fuses as per the manual. All seem to be fine. Any body out there got any suggestions??

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Switch your #45 relay for cooling with #46 for HDM. I just had this problem with my blazer and we just fixed it but doing that.

Posted on Mar 02, 2009

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The fix to the low beams not working as well as the daytime running lamps not working is to replace the # 46 relay (HDM).

Thanks for the assistance.

Posted on Apr 13, 2009

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Headlamp swicth

Posted on Feb 17, 2009

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The daytime lights run off the highbeam circuit on reduced voltage. If the lowbeam is not operational, take a look at the plug at the headlight and inspect for looseness. If tight, inspect for a constant ground and a 12v power supply with the headlights turned on low beam at the headlight connector. repair a necessary

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For the low beam problem, Swap relays 45 & 46 in the underhood fuse panel. Relay 46 is for the Low Beams. If that fixes the light, replace the relay that cam out of position 46.
Since the high mounted brake light is working, that indicates that the brake switch is good. You need to check the bulbs in the rear tail light assembly, if they are good, check fuse #34.

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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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Sounds like you have a bad headlight switch. I would also check fuses 1&2 in the fuse box, those are for the low beam headlights, and fuse 3 is for the instrument panel lights and the license plate lights. All 3 should be 10 amp fuses.

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THERE ARE FUSES THAT PROTECT THE HEADLIGHT CIRCUITS. CHECK TO SEE IF THE FUSES ARE GOOD. THIS SHOULD HELP YOU OUT REAL QUICK. THANKS FOR USING FIX-YA AND FOR AN HONEST RATING AS WELL. PLEASE KEEP ME POSTED. GOOD LUCK

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