Test U: An Individual Reversing Lamp Is Inoperative

PINPOINT TEST U: AN INDIVIDUAL REVERSING LAMP IS INOPERATIVE

Normal Operation
When the transmission is placed in REVERSE (R), the PCM 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. Ground for the lamps is provided through circuit 1205 (BK).

- DTC B2525 (Left Rear Backup Lamp Circuit Failure) - is a continuous and on-demand DTC that sets when the SJB detects an open or short to ground from 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 an open or short to ground from the RH reversing lamp voltage supply circuit.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- SJB

U1-U2:

U2-U3:

U4: