a. check Fuse #3, 30AMP on fuse box under rear seatb. Test grounding against the body of the car (at the tail hatch connection). If yes, suspect open ground (Black Wire) and start to track back up through the tailgate connection to the main car (this is where the problem often is).4. If you are getting power at Orange, while grounded to Black Wires... proceed to bench testing the wiper unit. You can only confirm the motor works...a. Remove washer motor from truck
b. Remove control module from washer motor (requires pulse signal form BDM on the dark green wire)
c. test motor using car battery charger and extended probes.5. If motor doesn't work, open up and check that worm gear isn't blocked, or winding motors aren't rusted/burnt. If you can't free gear up... you need to replace that unit.

6. If motor works there are three possibilities:a. your wiper control module is bad (the white box): replace
b. your control module isn't getting a signal via the dark green wire from the BDM that it should fire. If this is the case you need to: trace the green wire back through the circuit to the lift gate control module (driver side box). It should get intermittent low voltage if tested. Note: this won't be your only vehicle problem.
c. the vibration of the car has worn 'opens' in the connectors between the wiper motor and the circuit board (inside the white box). Fix: spot solder connector board pads to complete electrical connection... or replace board.

7. If you have a lift gate control module problem, you are likely having multiple problems at once: lift gate won't open, repeated clicking, key fob not working, rear not locking with key fob, etc.

8. You may get intermittent running of your wiper. Check 6c. above... you can tell by sitting in the truck with the gates closed and the (working 1 above) rear wiper switch on. Shake & push the white box on the wiper motor to help connections.

9. Other problem... and arguably the more likely culprit: the black ground wire, or fat orange power wire, or communications wire has fatigued doe to opening and closing the rear hatch. Note, it won't be obvious. The line will be severed 2"-3" back from the connector from the roof liner side. You will need to slice a repair in.

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My Fix Path:

1. Broken ground wire at the top hatch was causing an intermittent ground... sometimes the hatch worked, sometimes it didn't. Wiper motor wasn't working
2. The intermittent ground was giving a false positive circuit to the wiper... making think the problem was the wiper unit.
3. After confirming the wiper motor was working, I started to troubleshoot the control unit by tracing back the comm wire to the BDM. This lead me to the faulty ground.
4. Once repaired, I discovered that the white control box had an intermittent short due to insufficient solder being applied to the pads, coupled with too sharp a 'pincer' connector.

Good luck everyone who deals with this problem!