2007 Suburban LTZ.

I've had a series of peculiar electrical issues of late;
1) backup camera is "black",
2) clock on radio was off but radio worked fine, then it started working but wont keep time until you push that area of the screen it will update time
3) rear compressor for air ride only works if you jump relay under hood - changed controller under car, new shocks, new compressor - works fine manually but no auto adjust (I started another thread on this last year and it still doesn't work)
4) complete bank 1 ignition coils stopped working - traced issue to no ground at connector between coil packs. Although I suspected a bad ground on the level control module, I haven't check that yet. Wondering if I have a bad ground bock or broken ground wire somewhere. Cleaned and verified upper engine bay ground when fixing coil packs, but may be another location that I am unaware of...

 

if you think you have bad grounds...provide the part in question grd for testing purposes...run jumper wire from the neg bat terminal.

 

Other recent issue is that the reverse lights also don't work, yet the reverse in the trailer plug works fine.....
Also, the license plate lights are out.

 

for the reverse lights
remove the lens and inspect the bulbs; if the bulb is ok...check for battery voltage at the bulb socket

 

Yes, sorry - should have added that.....the bulbs are fine, no power at the socket and the ground seems fine.

All other lights in the rear work except the tag lights.

And the reverse lights work on the trailer plug (verified with 7-way tester).

Thanks so much for your help!

 

do you have power at the vehicle bu fuse? does the bu relay energize/click when uk shift to reverse.

 

I will check that out - didn't think the trailer plug and rear truck would be fed off of different relay - god point. I will dig into that today perhaps - thanks again for the pointer......

I really do think that I have a series of "related" issues with all this stuff seeming to go wrong - I cannot imagine multiple electrical failures on various sub systems - makes me think of a bad loom junction or something. I had a siilar issue in my 06 Jetta where the factory extended a wire inside a loom (not straight run) and the connection rotted out. Turned out to be a pretty common failure point - was hoping to find a similar "trend' on the truck and fix multiple issues at once ;-) Will check relay and fuse.....

 

if they have a common issue...tracing the one problem will locate the common fault. pull up a power distribution diagram and see what's shared.
radio is body wiring
air compressor is chassis wiring
coils are engine harness
Where do you want to start?