Navigator 4WD V8-5.4L (2010)
No
REMOVE the known good relay. INSTALL a new trailer tow parking lamp relay. TEST the system for normal operation.
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AA4 CHECK FOR VOLTAGE TO THE TRAILER TOW PARKING LAMP RELAY COIL
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Measure the voltage between the trailer tow parking lamp relay pin 1, circuit CLS30 (VT/WH), BJB face side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AA5.
No
REPAIR circuit CLS30 (VT/WH) for an open. TEST the system for normal operation.
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AA5 CHECK THE VOLTAGE SUPPLY CIRCUIT TO THE TRAILER TOW PARKING LAMP RELAY
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Place the headlamp switch in the OFF position.
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Measure the voltage between the trailer tow parking lamp relay pin 3, circuit SBB28 (GN/RD), BJB face side and ground.
-
Is the voltage greater than 10 volts?
Yes
GO to AA6.
No
VERIFY the BJB fuse 28 (25A) is OK. If OK, REPAIR circuit SBB28 (GN/RD) for an open. TEST the system for normal operation. If not OK, REFER
to the Wiring Diagrams to identify the possible causes of the circuit short. See: Diagrams/Electrical Diagrams/Diagrams By Number
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AA6 CHECK THE VOLTAGE SUPPLY CIRCUIT TO THE TRAILER TOW PARKING LAMP RELAY USING THE RELAY GROUND
PIN
-
Measure the voltage between the trailer tow parking lamp relay pin 3, circuit SBB28 (GN/RD), BJB face side and the trailer tow parking lamp
relay pin 2, circuit GD123 (BK/GY), BJB face side.
