Pinpoint Test X: The Individual Reversing Lamp Is Inoperative

Reversing Lamps

Pinpoint Test X: The Individual Reversing Lamp Is Inoperative

Refer to Wiring Diagram Set 93, Reversing Lamps for schematic and connector information. [1][2]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 X : 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.

X1 CHECK FOR VOLTAGE TO THE REVERSING LAMP

- Ignition OFF.

- Disconnect: Inoperative Reversing Lamp.

- Apply the parking brake.

- Ignition ON.

- Select REVERSE.

- For Fusion, measure the voltage between the LH rear lamp C487-1, circuit CLS10 (GN/BN), harness side and ground, or between the RH rear lamp C488-1, circuit CLS10 (GN/BN), harness side and ground.





- For MKZ, measure the voltage between the LH rear lamp C451-1, circuit CLS10 (GN/BN), harness side and ground, or between the RH rear lamp C461-1, circuit CLS10 (GN/BN), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to X2.

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

X2 CHECK FOR VOLTAGE TO THE REVERSING LAMP USING THE CONNECTOR GROUND

- For Fusion, measure the voltage between the LH rear lamp C487-1, circuit CLS10 (GN/BN), harness side and the LH rear lamp C487-2, circuit GD171 (BK/GY), harness side, or between the RH rear lamp C488-1, circuit CLS10 (GN/BN), harness side and the RH rear lamp C488-2, circuit GD171 (BK/GY), harness side.





- For MKZ, measure the voltage between the LH rear lamp C451-1, circuit CLS10 (GN/BN), harness side and the LH rear lamp C451-2, circuit GD171 (BK/GY), harness side, or between the RH rear lamp C461-1, circuit CLS10 (GN/BN), harness side and the RH rear lamp C461-2, circuit GD171 (BK/GY), harness side.





Is the voltage greater than 10 volts?

Yes
INSTALL a new bulb holder. TEST the system for normal operation.

No
REPAIR circuit GD171 (BK/GY) for an open. TEST the system for normal operation.