Pinpoint Test T: An Individual Fog Lamp Is Inoperative

Fog Lamps

Pinpoint Test T: An Individual Fog Lamp Is Inoperative

Refer to Wiring Diagram Set 86, Fog Lamps for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

When the fog lamp relay is energized, voltage is routed to the fog lamps. A separate ground circuit is supplied to each fog lamp.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

PINPOINT TEST T : 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.

T1 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.

- For Fusion, 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.





- For MKZ, measure the voltage between the LH fog lamp C152-1, circuit CLF12 (BN/YE), harness side and ground; or between the RH fog lamp C162-1, circuit CLF12 (BN/YE), harness side and ground.





Is the voltage greater than 10 volts?

Yes
REPAIR circuit GD121 (BK/YE) (LH fog lamp) or circuit GD123 (BK/GY) (RH fog lamp) for an open. TEST the system for normal operation.

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