Edge AWD V6-3.5L (2009)
The trailer tow parking lamp relay coil receives voltage through circuit CLS30 (VT/WH) when the vehicle parking lamps are illuminated. The trailer tow
parking lamp relay coil is grounded through circuit GD120 (BK/GN). The Battery Junction Box (BJB) fuse 9 (20A) supplies voltage to the trailer tow
parking lamp relay switch side. When the trailer tow parking lamp relay is energized, the voltage is routed to the trailer tow connector through circuit
CAT11 (BN).
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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Trailer tow parking lamp relay
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BJB
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Trailer
PINPOINT TEST AA: THE TRAILER LAMPS ARE INOPERATIVE - TRAILER PARKING LAMPS
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
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AA1 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR
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Ignition OFF.
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Place the headlamp switch in the PARKING LAMPS ON position.
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Measure the voltage between the trailer tow C439-3, circuit CAT11 (BN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
VERIFY the BJB fuse 9 (20A) is OK. If OK, GO to AA2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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AA2 CHECK THE TRAILER TOW PARKING LAMP RELAY
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Place the headlamp switch in the OFF position.
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Disconnect: Trailer Tow Parking Lamp Relay.
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Substitute a known good relay.
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Place the headlamp switch in the PARKING LAMPS ON position.
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Measure the voltage between the trailer tow C439-3, circuit CAT11 (BN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
REMOVE the known good relay. INSTALL a new trailer tow parking lamp relay. TEST the system for normal operation.
No
REMOVE the known good relay. GO to AA3.
