Fog/Driving Lamp: Description and Operation

CIRCUIT OPERATION
The fog lamps will operate only when the headlamp switch is in the ON position, and the operator has selected LOW beam operation. When the headlamps are in high beam operation, the fog lamps will not operate.

Circuit A3 from the Power Distribution Center supplies (PDC) voltage to a bus bar in the fuse block. Circuit F61 is one of four circuits that the bus bar feeds and is protected by a 10 Amp fuse in cavity 4. Circuit F61 connects to the fog lamp switch.

The fog lamp switch contains a relay that supplies voltage to the fog lamps. Circuit L4 from the multi-function switch supplies voltage to the coil side of the relay (only when the headlamps operate on LOW beam).

Circuit F61 supplies voltage to the contact side of the relay. During LOW beam headlamp operation when the fog lamp switch contacts CLOSE, circuit F61 connects to circuit L39.

Circuit L39 feeds right and left fog lamp. Circuit L39 also feeds the green L.E.D. in the switch that illuminates during fog lamps operation.

When the headlamp switch is in the PARK or ON position, circuit E1 from the headlamp switch supplies voltage for circuit E2. Circuit E2 contains a 4 Amp fuse in cavity 12 of the fuse block, and powers the bulb in the fog lamp switch.

Ground Circuit
Although circuit Z1 provides the ground path for the fog lamps, the circuit has different grounding points for each lamp. For the left fog lamp the grounding point is the left side of the radiator closure panel.

For the right fog lamp the grounding point is the right fender side shield.

Circuit Z3 supplies the ground path for the fog lamp switch. The grounding point for the headlamp switch is the instrument panel left center support.