1999 GMC Sierra Logo
Anonymous Posted on Oct 27, 2009

DRL is not working

I have 1999 GMC SIERRA 1500 4x4 , is not working DRL (day running lights) , I check the fuses , new bulbes , dos not work Thanks

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  • Master 2,049 Answers
  • Posted on Oct 27, 2009
Anonymous
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1996-99 GM trucks.There is a diode, located under the dash between the steering wheel and the radio, fastened to the round dash bar. The bolt that holds it on, threads into the top of the bar, it is near impossible to get at with a wrench. It is a finned block of (usaully black) aluminum about 2 inches squared 3 inches long. I found a easy way to get it out. Looking up you will see two tabs bent holding the diode in a bracket, bend them out of the way( you may have to bend the bracket a little aswell) and with patience the diode will slide out of the bracket, then disconect the electrical plug-in. I have found that this is the main reason for day-time driving light failure

Also, check your emergency brake pedal. Make sure it is all the way up. If it is down just one click the day time running lamps will not come on.

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1999 Chrysler T&C Limited - Driving lights/Fog Lights

The fuses that protect your headlamp circuits are Fuse Numbers [4] (Left High Beam), [5] (Right High Beam) [6] (Left Low Beam) and [7] (Right Low Beam).
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Fuse 5 is a 10 Amp fuse
Fuse 6 is a 20 Amp fuse
Fuse 7 is a 15 Amp fuse
All are located in the Power Distribution Center in the engine compartment.

The difference between a 1999 Chrysler Town & Country with DRL and WITHOUT DRL is that one has a DRL module and the other does not. The headlmps themselves are wired exactly the same.

To make yours work, you would have to add the DRL module and reprogram your Body Control Module (BCM) to accept the DRL module. Doing it any other way would probably result in the BCM setting fault codes and possibly even causing malfunctions in other non-headlamp-related circuits.
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I got a 2004 chevy trailblazer 4.2l. DRL/lowbeams don't work. All other lights (park lights, high beams, turn signal) work. Driver side DRL bulb blew. Both went out at the same time. Replaced both...

If it is anything like my 04 GMC Sierra, there is a relay panel under the hood. In that underhood box where you found the fuses, there are also relays. They pop out (the diagram is on the lid of the box). After the GMC hit 200k, the relays started going out. The high beams are on a relay, the lowbeams are on a different one. You can pop one out and replace it with the horn or foglight relay if you want to check it out. I am betting that the DRL bulb just happened to go at the same time. Mine go out regularly..I would say around every 10-15k miles. I don't know if this helps, it is just something that I have run across with a similar vehicle.
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I have a 1999 gmc sierra and my lights stay on all the time on day time running lights

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The problem with the DRL issue describd in the above posts is the DRl module(it needs to be replaced). The buzzing relay and intermittent on/off of passenger side DRl are indicators that the module needs to be replaced.
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