GMC Envoy--Headlight problems and possible fix

kage612

To all the people that are having problems with headlights not working on their 2004 (and I imagine other years as well) Envoy the fix is simple. There is a fuse box under the hood. Look in your owners manual and look for 'headlight control module.' It should be 45 in the book. To make sure that's the problem, swap out 46 with 45. They are the same. If your lights work, then you know it's the module. Most auto part stores don't have them, but I got one at the dealer for just under $60. FYI, it's also called a headlight relay. Hope this helps!

Mr_Shiftright

Thanks Kage for tip! We appreciate it!

I'll amend the header to your post so that more Envoy owners will spot it!

Host

Gunnyjim

My problem is that the left headlight low beam is out I replaced the bulb, checked fuses with an ohm meter to no avail. Any suggestions?

Mr_Shiftright

I guess you 'll have to trace wiring from the bulb back to the fuse box and look for a break. Do you have voltage to the bulb socket? If you do, that's not enough. You have to do a voltage drop test, which you can learn about on YouTube if you don't know how to do that.

Gunnyjim

Thank you Do you know where I can get a wiring diagram for this car?