The headlights are controlled by the MICU, based on combination light switch input signals.

When the headlights Auto-off Function is selected, the exterior lights automatically turn off vehicle is in the OFF (LOCK) mode, the driver's door is opened and closed.

The turn signal/hazard warning lights are controlled by the MICU, using input from the combination switch or hazard warning switch signal. When the MICU sees a left turn or right turn command from the combination switch, it blinks the front and rear turn signal lights for the left or right side of the car. When the MICU sees a hazard warning command from the hazard warning switch, it blinks the front and rear turn signal lights for both sides of the car. The system also includes wire break detection. This monitors the current value using the MICU. An abnormal value, is registered as a wire break (open) or faulty bulb. When this occurs, the MICU increases the turn signal lighting frequency. If the break detection shows that the current value has returned to the correct value, the MICU returns to the normal frequency.

The fog light is controlled by the MICU, based on switch input from the combination light switch.

To control the daytime running lights, the MICU can provide power to the high beam based on inputs from the combination light switch signal, parking brake signal, and auto light signal. When on, the MICU provides reduced power to the high beam using duty control. With the ignition ON, the parking brake switch OFF, and the combination light switch in the OFF or PARKING position, the MICU turns on the daytime running lights. With the ignition ON, the parking brake switch OFF, and the combination light switch in the AUTO position, the MICU turns on the daytime running lights when the automatic lighting control system does NOT command the headlights ON. With the ignition ON, the parking brake switch OFF, and the combination light switch in any position, the MICU will not turn on the daytime running lights. Once the parking brake is turned OFF (automatic lighting control system OFF), the MICU commands the daytime running lights ON. The daytime running lights will then remain ON regardless of the parking brake switch position, until the next key cycle.

The automatic lighting control system automatically turns the headlights ON and OFF based on ambient light conditions. The system consists of an automatic lighting control unit/sensor, the MICU, and the gauge control module. When the automatic lighting control unit/sensor output voltage reaches lighting delay time (about 5 seconds) after lighting illuminance from Off state, the parking lights, the side marker lights, the taillights, the license plate lights, and the headlights turn on. Automatic lighting control unit/sensor output voltage reaches turn off delay time (about 5 seconds) after off illuminance from lighting state, and the parking lights and the headlights turn off.

When the wiper switch is in a position other than OFF, the automatic lighting control unit/sensor counts and records how often the MICU commands on the wipers. it creates a record called the edge count. When the edge count reaches 5, the control unit turns on the headlights, the parking lights, the side marker lights, and the taillights. The system does NOT count wiper operation related to windshield washer operation. When wiper operation drops is off for 30 seconds or more, the system reduces the edge count by 1. It returns to normal mode (lights OFF) when the count reaches 0. The edge count is also cleared when the vehicle is stopped and the wiper switch is set to OFF.