Hi,
I have a 2012 Yukon Denali AWD 1500. About 125K, in case that means anything.
About a year ago I had my first headlight bulb burn out, driver's side. I replaced both left and right with "direct replacement" LED bulbs.
Yesterday both headlights stopped working. No high or low beams. Parking lights (and all other external lights) work fine.
I don't have other bulbs so I could not swap them out, but it would be very, very unlikely that both would fail at the exact same time... Especially LED's, I was thinking that was the last time I'd have to do something like that on the vehicle.
The vehicle has separate fuses for left/right high and low (four fuses), the odds that all four popped at once are slim to none but I checked them anyway, they're fine.
I swapped the relay in the engine compartment fuse box with two of the other identical relays in that box used for other purposes (the rear defroster and the parking lights.) No change in behavior of the headlights (no light), no change in behavior of the donor circuits - all continued to work fine with the former-headlight relay in place.
The inside switch seems to be working fine - at least it switches the parking lights, and the car "ding-ding-dings" when I turn it to other positions with the ignition on and door open.
Internet Rumor has it that there is something called a "headlight module" but I haven't been able to find anything on how to test that - or a part number in case I just wanted to buy a new one. So far I've drawn a blank on even "where is it"?
Seems like it has to be something that both headlights share in common - like the "headlight module", the switch, or perhaps a connector somewhere?
The car was worked on a few weeks ago (exhaust manifold replacement), I don't know that I've tried the ilghts since - we only use it when we need more space for something, it gets a few thousand miles a year. Yesterday may be the first time it's been used at night since the repair.
Any suggestions on troubleshooting, or anything that perhaps might need to be disconnected when replacing exhaust manifolds that maybe did not get reconnected after the job was done?
I've looked under the hood, of course, particularly around the manifolds, and no dangling wires or obviously disconnected connectors. Have pushed on all visible connectors too....
Ideas?
Thanks,
Todd
I have a 2012 Yukon Denali AWD 1500. About 125K, in case that means anything.
About a year ago I had my first headlight bulb burn out, driver's side. I replaced both left and right with "direct replacement" LED bulbs.
Yesterday both headlights stopped working. No high or low beams. Parking lights (and all other external lights) work fine.
I don't have other bulbs so I could not swap them out, but it would be very, very unlikely that both would fail at the exact same time... Especially LED's, I was thinking that was the last time I'd have to do something like that on the vehicle.
The vehicle has separate fuses for left/right high and low (four fuses), the odds that all four popped at once are slim to none but I checked them anyway, they're fine.
I swapped the relay in the engine compartment fuse box with two of the other identical relays in that box used for other purposes (the rear defroster and the parking lights.) No change in behavior of the headlights (no light), no change in behavior of the donor circuits - all continued to work fine with the former-headlight relay in place.
The inside switch seems to be working fine - at least it switches the parking lights, and the car "ding-ding-dings" when I turn it to other positions with the ignition on and door open.
Internet Rumor has it that there is something called a "headlight module" but I haven't been able to find anything on how to test that - or a part number in case I just wanted to buy a new one. So far I've drawn a blank on even "where is it"?
Seems like it has to be something that both headlights share in common - like the "headlight module", the switch, or perhaps a connector somewhere?
The car was worked on a few weeks ago (exhaust manifold replacement), I don't know that I've tried the ilghts since - we only use it when we need more space for something, it gets a few thousand miles a year. Yesterday may be the first time it's been used at night since the repair.
Any suggestions on troubleshooting, or anything that perhaps might need to be disconnected when replacing exhaust manifolds that maybe did not get reconnected after the job was done?
I've looked under the hood, of course, particularly around the manifolds, and no dangling wires or obviously disconnected connectors. Have pushed on all visible connectors too....
Ideas?
Thanks,
Todd
