Pinpoint Test V: The Individual Reversing Lamp Is Inoperative
Reversing Lamps
Pinpoint Tests
Pinpoint Test V: The 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 reversing lamps relay is energized, voltage is routed to the reversing lamps through circuit CLS10 (GN/BN). The reversing lamps are provided ground through circuit GD110 (BK/WH).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Bulb holder
PINPOINT TEST V: THE 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: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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V1 CHECK CIRCUIT CLS10 (GN/BN) FOR AN OPEN
- Apply the parking brake.
- Ignition ON.
- Select REVERSE.
- Measure the voltage between the LH reversing lamp C451-2, circuit CLS10 (GN/BN), harness side and ground; or between the RH reversing lamp C461-2, circuit CLS10 (GN/BN), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to V2.
No
REPAIR the circuit. TEST the system for normal operation.
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V2 CHECK CIRCUIT GD110 (BK/WH) FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: Inoperative Reversing Lamp.
- Measure the resistance between the LH reversing lamp C451-1, circuit GD110 (BK/WH), harness side and ground; or between the RH reversing lamp C461-1, circuit GD110 (BK/WH), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new bulb holder. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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