Pulled out the camera and it's getting power and ground and a reverse signal. Don't know what all the other multiple wires are for so didn't know what kinds of values they should see.
Well after about a week my camera went blank again and hasn't come back for at least 10 days. Got around to trying to diagnose it. I was getting the following voltages in both park and reverse (checked with and without camera connected):
Pin 1 (grn?): 12±0.5 from independent ground, unchanged while working
Pin 2 (wht): 8±0.5 from independent ground, unchanged while working
Pin 3 (blk): 0.01, ~0.8 while working
Pin 4 (red?): 0.01 ~0.8 while working
Pin 5 (orng?): 0.0 (ground, checked by getting same voltage on Pin 1 and Pin 2), unchanged while working
Pin 6 (bl/stripe?): 0.0 (??, did not get any reading when cross checking with Pin 1 & 2), unchanged - still couldn't figure out what it is for
Colors are my best guess as the lighting is bad, the wires are dirty, and I am red/green deficient so I have a hard time distinguishing some shades.
jahnny, I am curious which one you identified as the reverse signal or does anyone have access to a wiring diagram that can confirm what each pin is and what the proper voltage should be at each pin. I have a feeling 3&4 are the camera video out signals, maybe 6 is the zoom signal (it is a striped wire)?
I also opened the case on the camera itself. It isn't sealed, maybe it was glued (badly) from the factory but using a little screwdriver I was able to pop the top right off, it is held together with by the pins from the connector to the circuit board. I didn't see any bad solder joints or obvious failures. The camera lens is separate from the circuit board. The sensor sits on the bottom of the circuit board just above the lens.
So if it is a camera failure, it isn't an obvious failure, and considering how easy it was to open the case I didn't see any contamination.
Guess I will be going with my original plan and have them check/replace it at the next oil change.
2/23 edit: So the camera came back on Sunday, while cold and snowy, was still working this evening so I tore into it again to check voltages and those are reported above. Pretty sure pins 4 and 5 are the video out wires. Still don't know what the 8V signal is or what the last wire is for. Interestingly, the guidelines did not appear while I was working, but once the tailgate was shut they came back on. Word of caution to anyone wanting to check theirs, the battery drains fast with ignition on, even with lights, climate, and audio off. I kept my battery charger connected the whole time on the 10 amp output and it still drains.