Test U: The Reversing Lamps Are On Continuously

PINPOINT TEST U: THE REVERSING LAMPS ARE ON CONTINUOUSLY

U1:

U2-U7:

U7 Continued:

Normal Operation - Manual Transmission
The powertrain control module (PCM) sends a voltage reference signal to the reversing lamp switch through circuit 1789 (VT/WH). When the transmission is placed in REVERSE (R), the reversing lamp switch closes and routes the signal back to the PCM through circuit 359 (GY/RD). The PCM then sends a signal to the smart junction box (SJB) over the communication network. The SJB then provides voltage through circuits 1362 (DG/OG) and 1367 (WH/YE) to the LH and RH reversing lamps, respectively. The PCM sets DTCs if any faults with the digital transmission range (TR) sensor inputs are detected.

Normal Operation - Automatic Transmission
When the PCM detects the transmission is in REVERSE (R), a signal is sent to the SJB over the communication network. The SJB then provides voltage through circuits 1362 (DG/OG) and 1367 (WH/YE) to the LH and RH reversing lamps, respectively. The PCM sets DTCs if any faults with the digital transmission range (TR) sensor inputs are detected. The SJB sets DTCs if a fault is detected on the reversing lamp output circuits.

DTC B2525 - sets when the SJB detects a short to voltage on the LH reversing lamp voltage supply circuit.

DTC B2532 - sets when the SJB detects a short to voltage on the RH reversing lamp voltage supply circuit.

Possible Causes
- Circuit 1362 (DG/OG) short to voltage
- Circuit 1367 (WH/YE) short to voltage
- Circuit 1789 (VT/WH) short to ground
- Reversing lamp switch
- SJB
- PCM