Test X: The Reversing Lamps Are On Continuously

PINPOINT TEST X: THE REVERSING LAMPS ARE ON CONTINUOUSLY

X1-X6:

X7-X8:

Normal Operation - Automatic Transmission
When the transmission is placed in REVERSE, the powertrain control module (PCM) sends a message over the communication network to the instrument cluster indicating the transmission is in reverse gear. The instrument cluster then sends a message over the communication network to the smart junction box (SJB) indicating the transmission is in reverse gear. The SJB then provides ground to an internal solenoid which routes voltage to circuit 140 (BK/PK) to the reversing lamps. Ground is provided to the reversing lamps through circuit 57 (BK).

Normal Operation - Manual transmission
The SJB sends a reference signal to the reversing lamp switch through circuit 1789 (VT/WH). When the transmission is placed into reverse gear, the reversing lamp switch routes the voltage signal to ground through circuit 57 (BK).

When the transmission is placed in REVERSE, the SJB provides ground to an internal solenoid which routes voltage to circuit 140 (BK/PK) to the reversing lamps.

Possible Causes
- circuit 140 (BK/PK) short to voltage
- circuit 1789 (VT/WH) short to ground
- reversing lamp switch
- SJB
- PCM
- instrument cluster