Pinpoint Test U: An Individual Reversing Lamp Is Inoperative
Reversing Lamps
Pinpoint Tests
Pinpoint Test U: An Individual Reversing Lamp Is Inoperative
Refer to Wiring Diagram Set 93, Reversing Lamps for schematic and connector information. Diagrams By Number
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) - 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) - 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
PINPOINT TEST U: AN INDIVIDUAL REVERSING LAMP IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Make sure the bulb is good before continuing diagnostics.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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U1 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: Inoperative Reversing Lamp.
- Measure the resistance between the LH reversing lamp C451-1, circuit 1205 (BK), harness side and ground; or between the RH reversing lamp C461-1, circuit 1205 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to U2.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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U2 CHECK CIRCUIT 1362 (DG/OG) OR CIRCUIT 1367 (WH/YE) FOR A SHORT TO GROUND
- Disconnect: SJB C2280d.
- Measure the resistance between the LH reversing lamp C451-2, circuit 1367 (WH/YE), harness side and ground; or between the RH reversing lamp C461-2, circuit 1367 (WH/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to U3.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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U3 CHECK CIRCUIT 1362 (DG/OG) OR CIRCUIT 1367 (WH/YE) FOR AN OPEN
- Measure the resistance between the LH reversing lamp C451-2, circuit 1367 (WH/YE), harness side and the SJB C2280d-26, circuit 1362 (DG/OG), harness side; or between the RH reversing lamp C461-2, circuit 1367 (WH/YE), harness side and the SJB C2280d-13, circuit 1367 (WH/YE), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to U4.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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U4 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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