2000 GMC Yukon Denali reverse lights stay on while driving

[Skweez]

Recently I noticed my reverse lights are staying on while I'm driving. They dont stay on when my daytime lights are on and when I put it in reverse while day time lights are on they come on normally. When I turn the lights on with the control knob is when they stay on. Also when I put it in reverse with them turned on this way the reverse lights don't change at all, no brighter or dimmer. Also right about the same time my door lock on driver side won't lock with remote or with the lock/unlock button on driver door all other locks lock with both but the lock/unlock button on passenger door stopped working and none of the power window buttons work on any of the doors except driver door controls for all windows work. Any suggestions. Thanx

[Jsdirt]

Time to find all the body grounds and give them a good sanding / reconnecting. Could be a short somewhere along the circuit too.

 

Pink wire goes from the fuse to the switch on the transmission, and light green comes out of the switch, and goes all the way back to the lights. Pretty simple circuit. This tells me the problem has to be on the light green wire, since I can see no way that the trans.switch could close upon activating the parking lights/headlights.

 

Something is back feeding. Power doesn't care how it gets to ground - it seems your parking lights are grounding through the reverse lights, unless there's a short to power on the light green wire.

[Arth]

I found out something on my 2006 Avalanche that blew me away.

 

I replaced my tail lights and the new ones came with the entire harness that plugs into the block that controls all of my rear lighting functions including tail lights, bumper lights etc...

 

This block is on the passenger side fender behind the rear tire exposed to the elements. I wonder if your wire connections have finally broken? It's worth a look at least. When I replaced the tail light harnesses with the new one it was extremely filthy under there and my truck is a southern truck.

 

Recently I noticed my reverse lights are staying on while I'm driving. They dont stay on when my daytime lights are on and when I put it in reverse while day time lights are on they come on normally. When I turn the lights on with the control knob is when they stay on. Also when I put it in reverse with them turned on this way the reverse lights don't change at all, no brighter or dimmer. Also right about the same time my door lock on driver side won't lock with remote or with the lock/unlock button on driver door all other locks lock with both but the lock/unlock button on passenger door stopped working and none of the power window buttons work on any of the doors except driver door controls for all windows work. Any suggestions. Thanx

[Jsdirt]

Yeah they put these things in the greatest locations, don't they? The FPCM above the spare tire was a real smart one, especially for us northerners ... but I digress.

 

Good point - very well could be corrosion in there. If you live in the rust belt, I'd bet on it.

[Skweez]

Thanks for all the help I figured it out. What I did was plugged my power probe ect2000 smart transmitter into the plug for my reverse lights and followed the signal to the shirt which was in the trailer hook up. The left turn stop wire came loose. Put it back where it's supposed to go and everything went back to normal except for my speakers that's a whole Other issue I got to figure out

[Jsdirt]

Nice glad you figured it out - thanks for posting back!

 

Power Probe makes some great stuff. Going to be buying that thing in the near future. What a time saver.