Pinpoint Test V: The Reversing Lamps Are Inoperative
Reversing Lamps
Pinpoint Tests
Pinpoint Test V: The Reversing Lamps Are Inoperative
Refer to Wiring Diagram Set 93, Reversing Lamps for schematic and connector information. Diagrams By Number
Normal Operation - Automatic Transaxle
When the transaxle is placed in REVERSE (R), the Transmission Control Module (TCM) sends gear status information (through the Instrument Cluster (IC) gateway) to the Smart Junction Box (SJB). When the SJB receives a message indicating the transaxle is in REVERSE (R), the SJB provides ground to an internal relay, which routes the voltage to circuit CBP12 (GN/WH) to the reversing lamps.
Manual Transaxle
Voltage is supplied to the reversing lamp switch through circuit CBP18 (GY/OG). When the transaxle is placed in REVERSE (R), the reversing lamp switch routes the voltage to circuit CBP12 (GN/WH) to the reversing lamps.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Reversing lamp switch
- SJB
PINPOINT TEST V: THE REVERSING LAMPS ARE INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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V1 CHECK THE TRANSAXLE TYPE
- Ignition OFF.
- Check the transaxle type on the vehicle.
- Is the vehicle equipped with a manual transaxle?
Yes
GO to V2.
No
GO to V4.
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V2 CHECK CIRCUIT CBP18 (GY/OG) FOR AN OPEN
- Disconnect: Reversing Lamp Switch C169.
- Ignition ON.
- Measure the voltage between the reversing lamp switch C169-1, circuit CBP18 (GY/OG), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to V3.
No
VERIFY the SJB fuse 26 (7.5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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V3 BYPASS THE REVERSING LAMP SWITCH
- Ignition OFF.
- Connect a fused jumper wire between the reversing lamp switch C169-1, circuit CBP18 (GY/OG), harness side and the reversing lamp switch C169-2, circuit CBP12 (GN/WH), harness side.
- Ignition ON.
- Do the reversing lamps illuminate?
Yes
REMOVE the jumper wire. INSTALL a new reversing lamp switch. REFER to Reversing Lamp Switch Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit CBP12 (GN/WH) for an open. TEST the system for normal operation.
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V4 CHECK FOR TCM DTCs
- Ignition ON.
- Carry out the TCM on-demand self-test.
- Are any TCM DTCs present?
Yes
REFER to Transmission Control Systems. Testing and Inspection
No
VERIFY the SJB fuse 1 (10A) is OK. If OK, GO to V5. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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V5 CHECK CIRCUIT CBP12 (GN/WH) FOR AN OPEN
- Disconnect: Inoperative Reversing Lamp.
- Disconnect: SJB C2280e.
- Measure the resistance between an inoperative reversing lamp, harness side and the SJB, harness side as follows:
- Is the resistance less than 5 ohms?
Yes
GO to V6.
No
REPAIR the circuit. TEST the system for normal operation.
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V6 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. REFER to Body Control Systems. 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.
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