Circuit Operation

CIRCUIT OPERATION
On vehicles built for sale in Canada, the headlamps operate when the ignition switch is in the RUN position.

When the ignition switch is in the START or RUN position, circuit A1 from fuse 2 in the Power Distribution Center (PDC) connects to circuit A21. Circuit A21 powers circuit F12 through fuse 11 in the junction block. Circuit F12 splices to supply power to the DRL module.

The headlamp switch connects circuit A3 from fuse 7 in the PDC to circuit L20. Circuits A3 and L2O are HOT at all times. Circuit L2O connects to the headlamp dimmer switch circuitry in the multi-function switch and to the Daytime Running Lamp (DRL) module.

The DRL module receives the vehicle speed sensor input from circuit G7. Circuit G34 from the DRL module provides power for the high beam indicator lamp in the instrument cluster.

When the headlamp switch is OFF and the ignition switch is in the START or RUN position, the DRL module powers the headlamps on circuit L3 at reduced intensity. When the headlamps are ON, the dimmer switch in the multi-function switch powers the low beams on circuit L4.

Circuit L3 feeds the high beams of the headlamps. When the operator flashes the headlamps with the stalk of the multi-function switch, the DRL senses voltage on circuit L3.

Circuit Z1 provides ground for the DRL module.