Pinpoint Test Y: The Individual Reversing Lamp Is Inoperative

Reversing Lamps

Pinpoint Tests

Pinpoint Test Y: The Individual Reversing Lamp Is Inoperative

Refer to Wiring Diagram Set 93, Reversing Lamps for schematic and connector information. Diagrams By Number

When the reversing lamps relay is energized, voltage is routed to the reversing lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Rear lamp jumper harness



PINPOINT TEST Y: 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.

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Y1 CHECK FOR VOLTAGE TO THE INOPERATIVE REVERSING LAMP


- Ignition OFF.
- Disconnect: Inoperative Reversing Lamp.
- Apply the parking brake.
- Select REVERSE.
- Ignition ON.
- Measure the voltage between the LH rear lamp C414-4, circuit CLS10 (GN/BN), harness side and ground, or between the RH rear lamp C417-4, circuit CLS10 (GN/BN), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to Y2.

No
REPAIR circuit CLS10 (GN/BN) for an open. TEST the system for normal operation.

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Y2 CHECK FOR VOLTAGE TO THE INOPERATIVE REVERSING LAMP USING THE CONNECTOR GROUND


- Measure the voltage between the LH rear lamp C414-4, circuit CLS10 (GN/BN), harness side and the LH rear lamp C414-1, circuit GD148 (BK/YE), harness side, or between the RH rear lamp C417-4, circuit CLS10 (GN/BN), harness side and the RH rear lamp C417-1, circuit GD149 (BK/GY), harness side.




- Is the voltage greater than 10 volts?

Yes
REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation.

No
REPAIR the ground circuit in question for an open. TEST the system for normal operation.

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