Fog/Driving Lamp: Description and Operation

NOTE: The following information is intended to be used in conjunction with the electrical diagrams.

CIRCUIT OPERATION
The fog lamps are controlled by the fog lamp switch, park lamp relay and high beam relay. The fog lamps 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 fuse G in the Power Distribution Center (PDC) supplies voltage to circuit F39 through fuse 20 in the fuse block, Circuit F39 splices to supply power to the contact side of the park lamp relay.

Circuit L7 supplies power to the coil side of the park lamp relay Circuit L35 connects to the coil side of the relay and to circuit Z1 through the fog lamp switch. Ground for the coil side of the relay is provided on circuit Z1 through the fog lamp switch.

When the fog lamp switch closes, the park lamp relay contacts close connecting circuits F39 and L36. Circuit L36 powers the contact side of the high beam relay. When the headlamp high beams are off, the high beam relay is not energized and voltage flows through the normally closed contacts to circuit L39.

Circuit L39 supplies voltage to the fog lamps and the illumination lamp in the fog lamp switch. Circuit Z1 provides ground for the fog lamps.

If the high beam lamps are on, circuit L3 from the headlamp switch energizes the high beam relay When the high beam relay energizes, the contacts open and power is not supplied to the fog lamps. Circuit Z1 provides ground for the coil side of the high beam relay.

The grounding point for circuit Z1 is the left fender side shield.