F 350 2WD Super Duty V10-6.8L (2009)
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Disconnect all the SJB connectors.
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Check for:
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corrosion
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damaged pins
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pushed-out pins
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Connect all the SJB connectors and make sure they seat correctly.
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Operate the system and verify the concern is still present.
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Is the concern still present?
Yes
INSTALL a new SJB. 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
When the headlamp switch is placed in the PARKING LAMPS ON position, the Smart Junction Box (SJB) provides a ground for the parking lamp relay
coil (integrated into the SJB). When the parking lamp relay is energized, voltage is routed through circuit CLS30 (VT/WH) to the front, rear, license
plate, dual rear wheel marker, trailer tow exterior mirrors (if equipped) and cab marker lamps (if equipped).
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DTC B1578 (Lamp Park Input Circuit Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground in the parking
lamps on input circuit.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Headlamp switch
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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
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Check the recorded results from the SJB self-test.
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Was DTC B1578 recorded?
Yes
GO to Q2.
No
If equipped with cab marker lamps, GO to Q4.
If not equipped with cab marker lamps, GO to Q5.
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