Test Q: The Parking, Rear And License Plate Lamps Are On Continuously

PINPOINT TEST Q: THE PARKING, REAR AND LICENSE PLATE LAMPS ARE ON CONTINUOUSLY

Q1-Q4:

Q5:

Normal Operation
The central junction box (CJB) supplies voltage to the lighting control module (LCM) through circuit 195 (TN/WH). When a request for the parking lamps is detected, the LCM provides voltage to the parking and license plate lamps through circuit 14 (BN). Ground is provided for the parking lamps through circuit 57 (BK).

DTC B1578 - sets when the LCM detects a short to ground on the parking lamps on input circuit.

Possible Causes
- Circuit 14 (BN) short to voltage
- Circuit 1032 (WH/BK) short to ground
- LCM