F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
O7-O8
Test P: The Parking, Rear Or License Plate Lamps Are On Continuously
PINPOINT TEST P: THE PARKING, REAR OR LICENSE PLATE LAMPS ARE ON CONTINUOUSLY
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).
-
DTC B1578 (Lamp Park Input Circuit Short to Ground) - is 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:
