Voltage is available at all times to the headlamp switch from the LIGHTING fuse through CKT 42 (RED). Within the headlamp switch is a circuit breaker which resets automatically. The circuit breaker opens upon heating due to an overcurrent condition. With the circuit breaker open, current stops, and the circuit breaker's thermal element cools. When sufficiently cooled, the circuit breaker closes.

The three-position headlamp switch has the following positions:

With the headlamps switch in the off position, voltage is supplied to the switch side, cavity 87, of the Daytime Running Lamps (DRL) relay from the DRL fuse through CKT 340 (ORN). Voltage is supplied to the coil side of the DRL relay, cavity 85, from the GAUGES fuse when the ignition is in the RUN or START position. Ground is provided for the coil side of the relay through CKT 592 (LT GRN/BLK) to the normally closed DRL relay and indicator control switch, cavity G, at the DRL module. When the DRL relay is energized, the relay contacts close and voltage is supplied to the low beam of the left and right headlamp. Both headlamps are grounded at G 105, G 106, or G 107 to complete the circuit and provide daytime running lights.

With the headlamps switch in the headlamps position, voltage is available on CKT 10 (YEL) to the Daytime Running Lamps (DRL) module and the headlamps dimmer switch. The DRL module opens the contacts at the DRL relay and indicator control switch and this interrupts the path to ground. The contacts at the DRL relay open and the daytime running lamps are shut off. This interruption in the ground path also turns off the DRL indicator.

With the headlamp dimmer switch in the low position, voltage is directed to the DRL relay, cavity 87A, through CKT 359 (PPL). Without power to the coil side of the relay the switch contacts allow completion of the circuit to the low beam headlamps from the headlamp dimmer switch.

The headlamp dimmer switch is part of the multifunction switch on the steering column. By pulling the multifunction switch lever up along the axis of the steering column, the switch changes selections between the high beam and the low beam. When the headlamps dimmer switch is moved to the high position, voltage is available to the left high beam headlamp and then to the right high beam headlamp. Both headlamps are grounded at G 105, G 106, or G 107.

On vehicles equipped with dual rectangular headlamps, voltage is available to both the left and right outer headlamps and then to the inner headlamps. All the headlamps are grounded at G 105, G 106, or G 107.

With the headlamps dimmer switch in the high position, voltage is also available to the high beam indicator at the instrument cluster through CKT 11 (LT GRN). Ground G 102 completes the circuit and the indicator illuminates.

With the headlamps switch in the park or headlamp position, voltage is available on CKT 9 (BRN) to the following fuses and components:

All the lamps are case grounded.

Voltage is available at all times from the STOP/HAZ fuse to the stoplamp switch through CKT 140 (ORN). With the depression of the brake pedal, the contacts in the stoplamp switch close and voltage is available to the coil side of the brake lamp relay. The coil side of the relay is grounded at G 104 through CKT 150 (BLK) to complete the circuit. Voltage is available at all times from the BRAKE LAMPS fuse to the switch side of the brake lamp relay on CKT 540 (ORN). When the brake lamp relay energizes, the switch contacts close and voltage is made available to the turn/hazard lamp switch on CKT 20 (LT BLU) and then to the right tail stop/turn signal lamp on CKT 19 (DK GRN) or the left tail stop/turn signal lamp on CKT 18 (YEL).

Voltage is available from the TURN-B/U fuse, with the ignition switch in the RUN or START position, through the turn/hazard lamp switch, the turn/hazard flasher and back to the turn/hazard lamp switch.

With the turn signal switch in the left turn position, voltage is available to the left turn signal lamp, the left front marker lamp and left turn indicator on CKT 14 (LT BLU) and the stop lamp on CKT 18 (YEL) . With the turn signal switch in the right turn position, voltage is available to the right turn signal lamp, the right front marker lamp and right turn indicator on CKT 15 (DK BLU) and the stop lamp on CKT 19 (DK GRN). All the lamps are case grounded.

The lamps illuminate immediately and begin flashing when the current flow heats the timing element in the flasher. The timing element repeatedly opens and closes the circuit.

Voltage is available at all times from the STOP/HZRD fuse, through the turn/hazard lamp switch, the turn/hazard flasher and back to the turn/hazard lamp switch. With the hazard switch in the on position, voltage is available to the instrument cluster, the turn signal lamps, the marker lamps and the stop/turn signal lamps. All of the turn lamps, the marker lamps and the turn indicators flash on and off.

In the HAZARD position, the circuit is always open, and the turn lamps flasher controls the lamps.

When the ignition switch is in the RUN or START position, voltage is available through the TURN B/U fuse to the backup lamp switch on CKT 139 (PNK). With the transaxle in reverse, voltage is available to the left and right backup lamps, which are case grounded, on CKT 24 (LT GRN).

Voltage is supplied to the headlamps switch at all times by the PK LPS fuse. The headlamps switch provides voltage to the IP lamps dimmer switch in the park and head position through CKT 44 (DK GRN). With the contacts of the panel lamps switch closed, voltage is suppplied to the ILLUM fuse. This fuse protects CKT 8 (GRY) in the event of a short to ground or an overload and supplies voltage to the multifunctional alarm module, the transmission range lamp, and the illumination lamps at the instrument cluster. Rotation of the IP lamps dimmer switch toward the full OFF position (within 5 degrees of the end of rotation) reduces voltage until the current is so low that the lamps do not illuminate.

The seat belt alarm circuit operation is found in Audible Warnings Circuit Description . The transmission range lamp is case grounded and the illumination lamps are grounded through G 102.

The CTSY fuse provides voltage on CKT 40 (ORN) to cavity D8 in the IP wiring harness junction block for the body builder installed dome lamp. The ground is provided by the following path:

1. CKT 156 (WHT) from IP wiring harness junction block, cavity D7, to the IP lamps dimmer switch.
2. CKT 150 (BLK) from the IP lamps dimmer switch to ground G 200.