Mariner 4WD V6-3.0L (2010)
tow connector.
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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Trailer
PINPOINT TEST AA: THE TRAILER PARKING LAMPS ARE INOPERATIVE
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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Disconnect: Trailer Tow C439.
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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
GO to AA2.
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AA2 CHECK THE TRAILER TOW PARKING LAMP RELAY
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Disconnect: Trailer Tow Parking Lamp Relay.
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Substitute a known good relay.
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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.
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AA3 CHECK FOR VOLTAGE TO THE TRAILER TOW PARKING LAMP RELAY COIL
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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 parking lamp relay pin 2, circuit CLS30 (VT/WH), BJB face side and ground.
