Pinpoint Test Y: The Trailer Lamps Are Inoperative - All

Trailer Lamps

Pinpoint Tests

Pinpoint Test Y: The Trailer Lamps Are Inoperative - All

Refer to Wiring Diagram Set 95 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Trailer/Camper Adapter for schematic and connector information. Diagrams By Number

Normal Operation

The trailer tow connector receives ground through circuits RAT08 (WH) and GD149 (BK/GY) for all of the trailer lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Trailer



PINPOINT TEST Y: THE TRAILER LAMPS ARE INOPERATIVE - ALL

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

-------------------------------------------------
Y1 CHECK CIRCUITS RAT08 (WH) AND GD149 (BK/GY) FOR AN OPEN


- Disconnect: Trailer Tow C439.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the trailer tow C439-4, circuit RAT08 (WH), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.

No
REPAIR circuit RAT08 (WH) or circuit GD149 (BK/GY) for an open. TEST the system for normal operation.

-------------------------------------------------