Pinpoint Test 2: The Parking, Rear Or License Plate Lamps Are On Continuously

PINPOINT TEST 2: THE PARKING, REAR OR LICENSE PLATE LAMPS ARE ON CONTINUOUSLY

Normal Operation

The smart junction box (SJB) monitors the parking lamp request input from the headlight switch through circuit (L/GY). 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 through circuit (V/W) to the rear and front parking lamps.

- DTC B1578 (Lamp Park Input Circuit Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the parking lamps on input circuit.

Possible Causes
- Wiring, terminals or connectors
- Headlight switch
- SJB

Diagnostic Procedure