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 SJB (Smart Junction Box) receives an input from the headlamp switch indicating a request for the fog lamps, the SJB (Smart Junction Box) energizes the fog lamp relay (integrated into the SJB (Smart Junction Box)). When the fog lamp relay is energized, voltage is routed to the fog lamps and the fog lamps on indicator (located within the headlamp switch).
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 vehicles with 3.7L engines or the California Special package, measure the voltage between the LH fog lamp C1578-A, circuit CLF12 (BN/YE), harness side and ground; or between the RH fog lamp C1579-A, circuit CLF12 (BN/YE), harness side and ground.
- For vehicles with 5.0L engines without the California Special package, 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.
- For vehicles with 5.4L engines, measure the voltage between the LH fog lamp C1322-A, circuit CLF12 (BN/YE), harness side and ground; or between the RH fog lamp C1323-A, circuit CLF12 (BN/YE), harness side and ground.
Is the voltage greater than 10 volts?
Yes
REPAIR the ground circuit in question for an open. TEST the system for normal operation.
No
REPAIR circuit CLF12 (BN/YE) for an open. TEST the system for normal operation.