Pinpoint Test W: The Trailer Lamps Are On Continuously
Trailer Lamps
Pinpoint Tests
Pinpoint Test W: The Trailer Lamps Are On Continuously
Refer to Wiring Diagram Set 11, Fuse and Relay Information for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. Diagrams By Number
Normal Operation
When the vehicle parking lamps or stoplamps are illuminated, the corresponding trailer tow relay is energized, routing voltage to the trailer tow connector.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Trailer tow relay
- Trailer
PINPOINT TEST W: THE TRAILER LAMPS ARE ON CONTINUOUSLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Before beginning diagnostics, visually inspect the trailer tow connector for signs of corrosion or damage. Repair or install a new trailer tow connector as required.
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W1 CHECK FOR THE TRAILER TOW CLASS PACKAGE
- Inspect the vehicle for the trailer tow class package.
- Is the vehicle equipped with a class II trailer tow package?
Yes
GO to W4.
No
GO to W2.
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W2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR
- Ignition ON.
- Measure the voltage between the trailer tow 4-pin connector, harness side and ground as follows:
- Is any voltage present?
Yes
GO to W3.
No
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
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W3 CHECK THE TRAILER TOW RELAY
- Ignition OFF.
- Disconnect: Suspect Trailer Tow Relay.
- Ignition ON.
- Measure the voltage between the trailer tow 4-pin connector, harness side and ground as follows:
- Is any voltage present?
Yes
REPAIR the circuit in question for a short to voltage. TEST the system for normal operation.
No
INSTALL a new trailer tow relay for the one in question. TEST the system for normal operation.
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W4 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR
- Ignition ON.
- For the LH trailer stop/turn lamp, measure the voltage between the trailer tow connector LH stop/turn lamp voltage supply pins, circuit CAT06 (YE), component side and ground.
- For the RH trailer stop/turn lamp, measure the voltage between the trailer tow connector RH stop/turn lamp voltage supply pins, circuit CAT09 (GN), component side and ground.
- For the trailer parking lamps, measure the voltage between the trailer tow connector parking lamp voltage supply pins, circuit CAT17 (BN), component side and ground.
- Is any voltage present?
Yes
GO to W5.
No
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
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W5 CHECK THE SUSPECT RELAY
- Ignition ON.
- Disconnect: Suspect Trailer Tow Relay.
- For the LH trailer stop/turn lamp, measure the voltage between the trailer tow connector LH stop/turn lamp voltage supply pins, circuit CAT06 (YE), component side and ground.
- For the RH trailer stop/turn lamp, measure the voltage between the trailer tow connector RH stop/turn lamp voltage supply pins, circuit CAT09 (GN), component side and ground.
- For the trailer parking lamps, measure the voltage between the trailer tow connector parking lamp voltage supply pins, circuit CAT17 (BN), component side and ground.
- Is any voltage present?
Yes
REPAIR circuit CAT06 (YE) (LH turn), CAT09 (GN) (RH turn) or CAT17 (BN) (parking lamps) for a short to voltage. TEST the system for normal operation.
No
INSTALL a new trailer tow relay in question. TEST the system for normal operation.
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