Pinpoint Test R: Both Reversing Lamps Are Inoperative
Reversing Lamps
Pinpoint Test R: Both Reversing Lamps Are Inoperative
Refer to Wiring Diagram Set 93, Reversing Lamps for schematic and connector information. Diagrams By Number
Normal Operation - Automatic Transaxle
The reversing lamps are provided voltage from the reversing lamps relay. Voltage is supplied to the reversing lamps relay when the ignition is in RUN. The Transmission Control Module (TCM) monitors the transaxle gear status. When the TCM detects the transaxle is in REVERSE (R), the TCM provides a ground for the reversing lamps relay coil. When the relay is energized, voltage is supplied to the reversing lamps.
Manual Transaxle
Voltage is supplied to the reversing lamp switch when the ignition is in RUN. When the transaxle is in REVERSE (R), the reversing lamp switch routes voltage to the reversing lamps.
NOTE: The reversing lamps on 4-door vehicles share the same ground circuit.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Reversing lamps relay (automatic transaxle)
- Reversing lamp switch (manual transaxle)
- TCM (automatic transaxle)
PINPOINT TEST R: BOTH 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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R1 DETERMINE THE TRANSAXLE TYPE
- Ignition OFF.
- Check the vehicle for a manual transaxle.
- Is the vehicle equipped with a manual transaxle?
Yes
VERIFY the CJB fuse 6 (10A) is OK. If OK, GO to R2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
No
VERIFY the CJB fuse 6 (10A) is OK. If OK, GO to R4. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number
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R2 CHECK FOR VOLTAGE TO THE REVERSING LAMP SWITCH
- Disconnect: Reversing Lamp Switch C169.
- Ignition ON.
- Measure the voltage between the reversing lamp switch C169-1, circuit CBP06 (WH/BU), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to R3.
No
REPAIR circuit CBP06 (WH/BU) for an open. TEST the system for normal operation.
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R3 BYPASS THE REVERSING LAMP SWITCH
- Connect a fused jumper wire between the reversing lamp switch C169-1, circuit CBP06 (WH/BU), harness side and the reversing lamp switch C169-2, circuit CET47 (BU), harness side.
- 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
For 4-door vehicles, LEAVE the jumper wire connected. GO to R7. For 5-door vehicles, REMOVE the jumper wire. REPAIR circuit CET47 (BU) for an open. TEST the system for normal operation.
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R4 CHECK THE REVERSING LAMPS RELAY
- Disconnect: Reversing Lamps Relay.
- Ignition ON.
- Substitute a known good relay and recheck the reversing lamps operation.
- Do the reversing lamps operate correctly?
Yes
REMOVE the known good relay. INSTALL a new reversing lamps relay. TEST the system for normal operation.
No
REMOVE the known good relay. GO to R5.
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R5 CHECK FOR VOLTAGE TO THE REVERSING LAMPS RELAY
- Ignition ON.
- Measure the voltage between the reversing lamps relay pin 1, circuit CBP06 (WH/BU), BJB face side and ground; and between the reversing lamps relay pin 3, circuit CBP06 (WH/BU), BJB face side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to R6 .
No
REPAIR circuit CBP06 (WH/BU) for an open. TEST the system for normal operation.
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R6 BYPASS THE REVERSING LAMPS RELAY
- Connect a fused jumper wire between the reversing lamps relay pin 3, circuit CBP06 (WH/BU), BJB face side and the reversing lamps relay pin 5, circuit CET47 (BU), BJB face side.
- Do the reversing lamps illuminate?
Yes
REMOVE the jumper wire. GO to R8.
No
For 4-door vehicles, LEAVE the jumper wire connected. GO to R7. For 5-door vehicles, REMOVE the jumper wire. REPAIR circuit CET47 (BU) for an open. TEST the system for normal operation.
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R7 CHECK FOR VOLTAGE TO THE LH REVERSING LAMP
- Ignition OFF.
- Disconnect: LH Reverse Lamp C487.
- Ignition ON.
- Measure the voltage between the LH reversing lamp C487-1, circuit CET47 (BU), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
REMOVE the jumper wire. REPAIR circuit GD143 (BK/VT) for an open. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR circuit CET47 (BU) for an open. TEST the system for normal operation.
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R8 CHECK THE REVERSING LAMPS RELAY COIL GROUND CONTROLLED CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: TCM C1750A.
- Ignition ON.
- Measure the voltage between the reversing lamps relay pin 2, circuit CLS28 (BU/WH), BJB face side and ground.
- Is any voltage present?
Yes
REPAIR circuit CLS28 (BU/WH) for a short to voltage. TEST the system for normal operation.
No
GO to R9.
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R9 CHECK THE REVERSING LAMPS RELAY COIL GROUND CONTROLLED CIRCUIT FOR AN OPEN
- Ignition OFF.
- Connect: Reversing Lamps Relay.
- Ignition ON.
- Measure the voltage between the TCM C1750A-40, circuit CLS28 (BU/WH), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to R10.
No
REPAIR circuit CLS28 (BU/WH) for an open. TEST the system for normal operation.
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R10 CHECK THE TCM GEAR STATUS INPUT PID
- Ignition OFF.
- Connect: TCM C1750A.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: TCM DataLogger.
- Monitor the TCM gear status PID (GEAR_ENGAGED) while placing the gear selector lever through all its positions.
- Does the PID agree with the gear selections?
Yes
GO to R11.
No
REFER to Automatic Shifting Manual Transmission/Transaxle Testing and Inspection to continue diagnosis of the gear input.
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R11 CHECK FOR CORRECT TCM OPERATION
- Ignition OFF.
- Disconnect all the TCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the TCM 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 TCM. REFER to Automatic Shifting Manual Transmission/Transaxle Transmission Control Module (TCM). 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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