Headlamp Switch: Description and Operation

CIRCUIT OPERATION
In OFF or Parking Lamp Position
Circuit A3 originates in the Power Distribution Center (PDC) and supplies battery voltage for the headlamp switch. A 40 Amp fuse protects the A3 circuit. The headlamp switch has an internal 24 Amp circuit breaker that connects circuit A3 to either the L2 or L20 circuits, depending on switch position.

In the OFF and PARK positions the headlamp switch feeds the L20 circuit that connects to the multi-function switch. Circuit L20 powers the high beam circuit when the operator flashes the headlamps with the turn signal stalk of the multi-function switch. when the operator flashes the headlamps with the stalk, the multi-function switch connects the L20 circuit to the L3 circuit. The L3 circuit feeds the high beam of the headlamps.

In ON Position
When the headlamp switch is in the ON position, it connects the A3 circuit from the PDC to circuit L2. Circuit L2 connects to the multi-function switch and feeds the L4 circuit (for low beam operation). The L4 circuit connects to a bus bar in the fuse block. Circuits L43 and L44 connect to the bus bar in fuse block and power the low beam headlamps. Circuit L43 supplies voltage to the left headlamp. Circuit L44 supplies voltage to the right headlamp. Both the L43 and L44 circuits have separate 10 Amp fuses located in fuse block. Fuse 17 protects circuit L43, and fuse 18 protects circuit L44.

When the operator selects high beam operation with the turn signal stalk of the multi-function switch, circuit L2 connects to the L3 circuit, Circuit L3 powers high beam operation.

On vehicles equipped with Remote Keyless Entry (RKE) the L4 circuit is spliced to the RKE module. The RKE module uses this circuit to flash the headlamps when the operator has activated the PANIC mode with the key fob.