Normal Operation - Automatic Transmission
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
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