Pinpoint Test U: An Individual Reversing Lamp Is Inoperative

Reversing Lamps

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

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

- Bulb holder

PINPOINT TEST U : 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.

U1 CHECK FOR VOLTAGE TO THE INOPERATIVE REVERSING LAMP

- Ignition OFF.

- Disconnect: Inoperative Reversing Lamp.

- Apply the parking brake.

- Ignition ON.

- Select REVERSE.

- Measure the voltage between the LH rear lamp C451-2, circuit CLS10 (GN/BN), harness side and ground; or between the RH rear lamp C461-2, circuit CLS10 (GN/BN), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to U2.

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

U2 CHECK FOR VOLTAGE TO THE INOPERATIVE REVERSING LAMP USING THE CONNECTOR GROUND

- Measure the voltage between the LH rear lamp C451-2, circuit CLS10 (GN/BN), harness side and the LH rear lamp C451-1, circuit GD149 (BK/GY), harness side; or between the RH rear lamp C461-2, circuit CLS10 (GN/BN), harness side and the RH rear lamp C461-1, circuit GD149 (BK/GY), harness side.





Is the voltage greater than 10 volts?

Yes
REPAIR circuit GD149 (BK/GY) for an open. TEST the system for normal operation.

No
INSTALL a new bulb holder. TEST the system for normal operation.