Pinpoint Test V: The Individual Reversing Lamp Is Inoperative

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: The battery ground cable must be disconnected for accurate test results when checking ground circuits for continuity to ground.

V1 CHECK CIRCUIT GD149 (BK/GY) OR CIRCUIT GD151 (BK/GN) FOR AN OPEN
- Key in OFF position.
- Disconnect: Inoperative Reversing Lamp
- For Edge, measure the resistance between the LH reversing lamp C451-1, circuit GD149 (BK/GY), harness side and ground, or between the RH reversing lamp C461-1, circuit GD151 (BK/GN), harness side and ground.
- For MKX, measure the resistance between the LH reversing lamp C487-2, circuit GD149 (BK/GY), harness side and ground, or between the RH reversing lamp C488-2, circuit GD151 (BK/GN), harness side and ground.
- Is the resistance less than 5 ohms?
1. YES : Go to V2.
2. NO : REPAIR the ground circuit in question. TEST the system for normal operation.
V2 CHECK CIRCUIT CLS10 (GN/BN) FOR AN OPEN
- Apply the parking brake.
- Select REVERSE.
- Key in ON position.
- For Edge, 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.
- For MKX, measure the voltage between the LH reversing lamp C487-1, circuit CLS10 (GN/BN), harness side and ground, or between the RH reversing lamp C488-1, circuit CLS10 (GN/BN), harness side and ground.
- Is the voltage greater than 10 volts?
1. YES : INSTALL a new bulb holder or rear lamp assembly. REFER to Rear Lamp Assembly in this. TEST the system for normal operation.
2. NO : REPAIR the circuit. TEST the system for normal operation.