Pinpoint Test R: An Individual Fog Lamp Is Inoperative

Fog Lamps

Pinpoint Test R: An Individual Fog Lamp Is Inoperative

Normal Operation

The Steering Column Control Module (SCCM) monitors the fog lamp switch position by sending a voltage signal to the headlamp switch. When the fog lamp switch is engaged, the voltage signal is routed to ground indicating a request for the fog lamps.

The SCCM (Steering Column Control Module) sends a message over the High Speed Controller Area Network (HS-CAN) to the Body Control Module (BCM) to indicate the fog lamp switch position. When the BCM (Body Control Module) receives input from the SCCM (Steering Column Control Module) indicating a request for the fog lamps, the BCM (Body Control Module) provides ground to the fog lamp relay (integrated into the BCM (Body Control Module) ). When the fog lamp relay is energized, voltage is routed to the fog lamps. The fog lamps share a common ground circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

PINPOINT TEST R : AN INDIVIDUAL FOG 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.

R1 CHECK FOR VOLTAGE TO THE FOG LAMP

- Ignition OFF.

- Disconnect: Inoperative Fog Lamp.

- Ignition ON.

- Place the headlamp switch in the PARKING LAMPS ON position and engage the fog lamp switch.

- Measure the voltage between the LH fog lamp C152-A, circuit CLF12 (BN/YE), harness side and ground; or between the RH fog lamp C162-A, circuit CLF12 (BN/YE), harness side and ground.





Is the voltage greater than 10 volts?

Yes
REPAIR circuit GD122 (BK) for an open. TEST the system for normal operation.

No
REPAIR circuit CLF12 (BN/YE) for an open. TEST the system for normal operation.