'07 Yukon No running/parking lights? Need help.

[mudyukon]

Hello,
I have an -07 Yukon XL. My running / parking light quit working. This means at night I have no taillights on. The front amber lights do not light up. Also the license plate light too does not I believe. Brake lights work when pedal is pressed.

I checked fuses and relay. Now when I jumper the relay for the running lights (pin 30 and 87) the running lights work. So I know all my wiring past the relay is good.
What would be next? See if the BCM is outputting power to the lights? I was looking for a BCM pin diagram and haven't found one yet.. I would appreciate any help, thanks!

 

[Trey Hardy]

Hello,
I have an -07 Yukon XL. My running / parking light quit working. This means at night I have no taillights on. The front amber lights do not light up. Also the license plate light too does not I believe. Brake lights work when pedal is pressed.

I checked fuses and relay. Now when I jumper the relay for the running lights (pin 30 and 87) the running lights work. So I know all my wiring past the relay is good.
What would be next? See if the BCM is outputting power to the lights? I was looking for a BCM pin diagram and haven't found one yet.. I would appreciate any help, thanks!

Bulbs not blown?
My rear tag lights always falls out it’s aggravating.
Won’t the taillights come on if you cut the headlights on instead of leaving it in auto?
Sometimes these bulb sockets/plugs get corrosion in them and won’t make good connection my buddy at the shop has had to change quiet a few on a couple 07-13 models

 

[mudyukon]

Bulbs not blown?
My rear tag lights always falls out it’s aggravating.
Won’t the taillights come on if you cut the headlights on instead of leaving it in auto?
Sometimes these bulb sockets/plugs get corrosion in them and won’t make good connection my buddy at the shop has had to change quiet a few on a couple 07-13 models

Bulbs are good, they all light up (front and back) if I jump the relay for them... They do not come on in auto mode on the switch, or when I turn the dial to turn them on manually. Somehow the relay is not get turned on. I guess the BCM is responsible for that?

 

[Geotrash]

Hello,
I have an -07 Yukon XL. My running / parking light quit working. This means at night I have no taillights on. The front amber lights do not light up. Also the license plate light too does not I believe. Brake lights work when pedal is pressed.

I checked fuses and relay. Now when I jumper the relay for the running lights (pin 30 and 87) the running lights work. So I know all my wiring past the relay is good.
What would be next? See if the BCM is outputting power to the lights? I was looking for a BCM pin diagram and haven't found one yet.. I would appreciate any help, thanks!

Can we assume you replaced the relay as well?

An alldatadiy subscription is gold for situations like this. They have all of the wiring diagrams and troubleshooting steps laid out.

 

[mudyukon]

Can we assume you replaced the relay as well?

An alldatadiy subscription is gold for situations like this. They have all of the wiring diagrams and troubleshooting steps laid out.

Yes swapped the relay with the starter relay next to it..

 

[B-train]

Maybe a faulty switch?

 

[mudyukon]

Maybe a faulty switch?

Its a possibility, but when the switch is in auto it makes the headlights and instrument lights come on.

 

[mudyukon]

I've been searching the web for a BCM pin diagram with no luck yet. Sounds like the BCM supply a ground to the parking lamp relay. I just have to figure out which wire on the BCM.

 

[Geotrash]

I've been searching the web for a BCM pin diagram with no luck yet. Sounds like the BCM supply a ground to the parking lamp relay. I just have to figure out which wire on the BCM.

Yes, the BCM supplies the ground. Don’t have a color code chart for you but this may help. Note that it’s for a 2012 Denali though.

 

[mudyukon]

That does help, Thank you. It looks like a light blue wire going into the BCM, and Dark Blue coming out. Ill have to see if I can locate those.