Question about 2004 GMC Envoy

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Checked fuses , relay, dimmer switch in my 2004 GMC envoy, still no low beam headlights. Pleas help:(

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How did you check the relay? Have you tried switching relay #45 with relay #46?

Posted on Apr 27, 2011

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If you have checked and discounted the relay, the only things left are the headlight switch and the wiring and to the headlights. Try the switch first. It is not impossible that both bulb's low beam filaments may have fused at the same time, unlikely but not impossibly. (It will not be fuses, unless two fuses blew together).

Posted on Apr 07, 2011

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I have the same exact truck

Posted on Sep 06, 2011

  • brandi2010 Sep 06, 2011

    And problem if yu figure it out contact me.

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2 Answers

2004 gmc envo when engine is off and in park headkights stay on


Do they stay on after key is removed from ignition lock cylinder ?

Check HDM relay 46 in the under hood fuse / relay box . Relay contacts stuck closed , possibly ! The relay supplies B+ voltage to the low beam fuse's ! Let me know if that works or not . If not , will go on too more diagnostics steps .

Jul 31, 2016 | 2004 GMC Envoy XL

1 Answer

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.

Jul 30, 2014 | 2004 GMC Envoy

1 Answer

2004 envoy xuv low beams dont work switched fuses 45 and 46 still nothing any ideas


Other possibilities are; the bulbs themselves, burnt or corroded bulb sockets, or a bad headlight selector switch.

Dec 11, 2011 | 2004 GMC Envoy

1 Answer

I HAVE A 2003 GMC ENVOY. HAVE AUTO HEADLIGHTS BUT WHILE DRIVING AT NIGHT THE HEADLIGHTS GO OUT AND SOMETIMES COME BACK ON SOMETIMES DON'T. THE BRIGHTS WILL WORK AND THE TAILLIGHTS ARE STILL ON EVEN WHEN...


Yes, very common problem. Switch RELAY # 46 with relay # 45 (the two black ones). Relay #46 is the relay for both sides for low beams #45 is the relay for the fan clutch, (same model #). If you now have lights, either clean the contacts really good both in the fuse box and the relay, or get a new relay. New relays are between $25 and $50 depending on where you get them.

Feb 19, 2011 | 2002 GMC Envoy

1 Answer

The auto headlights on my 2004 gmc envoy wont work at all! No low beam lights work! I checked the fuses and they are all good. what could be wrong?


Relay #46 in the underhood fuse panel is probably bad. You can verify this by swapping it with relay #45. Also, sometimes the relay contacts become corroded, check these when you have the relay out.

Jan 30, 2011 | 2004 GMC Envoy

1 Answer

Is there more than one relay switch? I found one for the high beams but not one for the low beams. I changed my dimmer switch and the bulbs but nothing has helped, I have high beams just not low beams and...


The low beam relay is #46 in the underhood fuse panel. check its contact pins before replacing it. If they are corroded, try cleaning them first.

Nov 28, 2010 | 2004 GMC Envoy

2 Answers

2003 gmc Envoy Low Beam Headlights both quit at the same time. Checked fuses and replaced bulbs. No dice. ????


Relay in fuse box under hood on driver side wheel well labeled HDM, #46 on 2004 Envoy XUV. Swap with relay #45 labeled "Fan" to test. That was my problem.

Good Luck,
Sam

Jul 01, 2010 | 2004 GMC Envoy

2 Answers

Both lowbeam headlight not working


Duralast / Relay - Headlamp Part Number:
20601
Autozone: $39.99 I had the exact problem with my 2004 Envoy. You need to replace the Headlamp Relay. This is a very simple fix. The relay is located under the hood in box just above the battery. Pull the cover off of the box, look at underside of box to see layout of relays/fuses, i do not recall the exact abbrevaition used for the headlamp relay but there are only two relays in there that look like the one you need, just play with those two and you will get it. Do not take it to the shop, my wife took ours in and they charged us way to much to diagnose such a simple fix. You can test it before you buy the part by switching the relays that are the same around and seeing if your headlights work (they will). It is as simple as changing what looks like a big fuse.

Feb 17, 2010 | 2004 GMC Envoy

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