Autolamp

The autolamps are controlled by the autolamp switch and the autolamp control unit. Power is supplied at all times:
^ through 15 A fuse (No. (49), located in the fuse and fusible link box)
^ to autolamp control unit terminal (5) and
^ autolamp relay terminal (3), and
^ through 15 A fuse (No. (50), located in the fuse and fusible link box)
^ to autolamp relay terminals (1) and (6).
When the ignition switch is in the ON position, power is supplied:
^ through 7.5 A fuse (No. (13), located in the fuse block)
^ to autolamp control unit terminal (1).

AUTOMATIC ILLUMINATION
When the autolamp switch is turned to the ON position, ground is supplied to the autolamp control unit terminal (7):
^ through autolamp switch terminal (17)
^ to autolamp switch terminal (16)
^ through body grounds (M5) , (M78) and (M123).
With power at terminals (1) and (5), and ground supplied, the autolamp control unit will measure the ambient light intensity through terminals (4) and (6). If the autolamp sensor does not detect sufficient light, then ground is supplied:
^ to autolamp relay terminal (2) and
^ tail lamp relay terminal (1)
^ through autolamp control unit terminal (3)
^ to autolamp control unit terminal (8)
^ through body grounds (M5), (M78) and (M123).
With power and ground supplied, the autolamp relays are energized and power is supplied:
^ through autolamp relay terminal (5)
^ to LH headlamp relay terminal (3)
^ through LH headlamp relay terminal (4)
^ to LH headlamp terminal (3), and
^ through autolamp relay terminal (7)
^ to RH headlamp relay terminal (3)
^ through RH headlamp relay terminal (4)
^ to RH headlamp terminal (3).
For USA models, ground is supplied to each headlamp terminal (2) through body grounds (E3), (E14) and (E53).
For Canada models, ground is supplied to LH headlamp terminal (2) through body grounds (E3), (E14) and (E53). Ground is supplied to RH headlamp terminal (2) through daytime light control unit terminal (8).
With power and ground supplied, the headlamps will illuminate.

DELAYED EXIT
With the autolamp switch in the ON position and the ignition switch turned from the ON to OFF position, the autolamp control unit will no longer receive a voltage signal at terminal (1). This will start the autolamp control unit's internal timer. The timer is set based on the resistance value at autolamp control unit terminal (2). With the timer running, the headlamps and parking lamps will continue to illuminate. When the timer reaches the end of its cycle, the headlamps and parking lamps will turn off.