Test V: The Reversing Lamps Are On Continuously

PINPOINT TEST V: THE REVERSING LAMPS ARE ON CONTINUOUSLY

Normal Operation - Manual Transmission
The 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 message to the smart junction box (SJB), through the instrument cluster (IC) gateway function, 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.

Normal Operation - Automatic Transmission
When the PCM detects the transmission is in REVERSE (R), a message to the smart junction box (SJB), through the instrument cluster (IC) gateway function, 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.

- DTC B2525 (Left Rear Backup Lamp Circuit Failure) - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage on the LH reversing lamp voltage supply circuit.
- DTC B2532 (Right Rear Backup Lamp Circuit Short to Battery) - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage on the RH reversing lamp voltage supply circuit.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Reversing lamp switch (manual transmission)
- Digital transmission range (TR) sensor input (automatic transmission) concern
- SJB
- PCM

V1:

V2-V7:

V7 Continued: