Navigator 4WD V8-5.4L (2010)
Yes
INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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Pinpoint Test Q: The Parking, Rear Or License Plate Lamps Are On Continuously
Parking, Rear and License Plate Lamps
Pinpoint Tests
Pinpoint Test Q: The Parking, Rear Or License Plate Lamps Are On Continuously
Refer to Wiring Diagram Set 92, Parking, Rear and License Lamps for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) monitors the parking lamp request input from the headlamp switch. The SJB provides a ground for the parking lamp relay
coil (integrated into the SJB) when a request for the parking lamps is received. When the parking lamp relay is energized, voltage is routed to the front
and rear parking lamps.
-
DTC B1578 (Lamp Park Input Circuit Short to Ground) - an on-demand DTC that may set when the SJB detects a short to ground in the parking
lamps on input circuit.
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Headlamp switch
-
SJB
PINPOINT TEST Q: THE PARKING, REAR OR LICENSE PLATE LAMPS ARE ON CONTINUOUSLY
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Q1 USE THE RECORDED DTCs FROM THE SJB SELF-TEST
-
Check the recorded results from the SJB self-test.
-
Was DTC B1578 recorded?
Yes
GO to Q2.
No
GO to Q4.
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Q2 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH
-
Ignition OFF.
-
Disconnect: Headlamp Switch C205.
