Question about 2000 GMC Sierra

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2000 GMC 1500 4wd

Headlights/running lights won't turn on. All othe lights work including Hi-beams. Checked DLR relay and fuses all working. Any other suggestions?

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Make sure that ypur parking brake is completely released because if it is engaged even slightly the daytime lights will trun off. If that's not the problem then check the bulbs.

Posted on Mar 30, 2009

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I have no low beam headlights. already checked bulbs, fuses, relay and dimmer switch. can you help?


Before you replace the #46 HDM relay (in the fuse block under the hood) try exchanging it with the #45 cooling fan relay and see if your low beam lights work. If they do, the HDM relay (actually solid state module, not a relay) is bad.

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Have you checked to see if the bulbs are burnt out or if the low beam fuses are Blown?

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Daytime running light module location 2001 impala


The daytime running lamps in your 2001 Chevrolet Impala are controlled by the Body Control Module (BCM) Here is a description of how the system works:

The ambient light sensor is a light-sensitive transistor that varies its voltage signal to the Body Control Module (BCM) in response to changes in the outside (ambient) light level. When the BCM receives this signal, the BCM turns ON either the DRL or the headlamp relay for auto headlamp operation. Any function or condition that turns ON the headlamps will cancel the DRL operation.
Thirty seconds after you start the ignition with the headlamp switch set in the OFF position, the DRL will perform one of two actions:

Illuminate the high beam headlights at a reduced intensity in daylight conditions
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The DRL/EXT lamps fuse in the top of the engine fuse block supplies battery positive voltage to both the DRL switch contacts and to the DRL relay coil. When the BCM energizes the DRL relay coil, current flows through the right high beam lamp, to the left hand high beam lamp, to the energized DRL relay switch contacts, to ground G101.
The high beam headlamps are now in series, and split the voltage so that the headlamps illuminate at halt intensity. The DRL operates when the ignition switch is in the RUN position, and the parking brake is not set or the transmission is not in park. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate.

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Headlights-burnt-out-replaced-fuses-&-ew-uls-oth-still-not-workig-what-else-could-it-e-


Not completely sure your problem. Are you low beams out and your high beams still work? If so, switch relay #46 with relay #45 in the fuse box under the hood. Do your lights now come on? If so, replace the low beam relay.

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1 Answer

I have a 99 gmc sierra 1500 extended cab, my drl's work, but when i turn on to the headlights they do not come on any brighter than the drls. this just happened suddenly one night. high beams work fine, i...


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Day time running lights run low voltage to the high beam bulbs so it sounds to me like you need two new bulbs or you need to check the fuses and see if any need replaceing.

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