Auto Lamp Operation

Automatic Illumination
When the ignition switch is in ON position, power is supplied
- through 10 A fuse (No. 30, located in the fuse block)
- to headlamp control unit terminal 2.

With power at terminal 2 and lighting switch in AUTO1 or AUTO2 position, the headlamp control unit will measure the ambient light intensity through terminals 10 and 21. If the autolamp sensor does not detect sufficient light, power is supplied to headlamps in the same manner as low or high beam operation. The headlamp control unit illuminates the headlamps High or Low according to combination switch position HIGH or LOW. At this time, ground is also supplied to tail lamp relay through headlamp control unit terminal 12 to energize tail lamp relay. Then tail lamp relay supplies power to turn on parking, license, tail lamps and interior illumination.

Shut-off Delay
While the headlamps are lit in the automatic illumination mode and the ignition switch is turned from ON to OFF position, the autolamp shut-off delay timer starts. At this time, ground to tail lamp relay is discontinued. The delay time is set based on the resistance value at headlamp control unit terminal 14. With the timer running, the headlamps remain lit. When the timer reaches the end of its cycle, the headlamps turn off. Headlamp lighting time can be adjusted from about 0 to 3 minutes.

THEFT WARNING SYSTEM
If the theft warning system is triggered, alarm signal is sent
- to headlamp control unit terminal 19
- from smart entrance control unit terminal 29.
Then headlamp control unit operates to flash the high beams.