System Description (For USA)

The headlamps are controlled by the lighting switch.
Power is supplied at all times:
^ through 15 A fuse (No. (49), located in the fuse and fusible link box)
^ to lighting switch terminal (1) and
^ combination switch terminal (16), and
^ through 15 A fuse (No. (50), located in the fuse and fusible link box)
^ to lighting switch terminal (3) and
^ combination switch terminal (14).

Low beam operation
When the combination switch is placed in the LOW ("B") position, with the lighting switch in the 2ND position, power is supplied:
^ from lighting switch terminal (2)
^ to LH headlamp relay terminal (3)
^ through LH headlamp relay terminal (4)
^ to LH headlamp terminal (3), and
^ from lighting switch terminal (4)
^ to RH headlamp relay terminal (3)
^ through RH headlamp relay terminal (4)
^ to RH headlamp terminal (3).
Ground is supplied to each headlamp terminal (2) through body grounds (E3), (E14) and (E53).
With power and ground supplied, the low beam headlamps will illuminate.

High beam operation
When the combination switch is placed in the HIGH ("A") position, with the lighting switch in the 2ND position, power is supplied:
^ from lighting switch terminal (2)
^ to combination switch terminal (12)
^ through combination switch terminal (11)
^ to LH headlamp relay terminal (2) and
^ RH headlamp relay terminal (2).
Ground is supplied to each headlamp relay terminal (1) through body grounds (E3), (E14) and (E53).
With power and ground supplied, the headlamp relays energize and power is supplied:
^ through LH headlamp relay terminal (5)
^ to LH headlamp terminal (1), and
^ through RH headlamp relay terminal (5)
^ to RH headlamp terminal (1) and
^ combination meter terminal (6) for the HIGH BEAM indicator.
Ground is supplied to combination meter terminal (12) through body grounds (M5) , (M78) and (M123).
Ground is supplied to each headlamp terminal (2) through body grounds (E3), (E14) and (E53) . With power and ground supplied, the high beams and the HIGH BEAM indicator will illuminate.

Flash-to-pass operation
When the combination switch is placed in the PASS ("C") position, both headlamp relays are energized to disable the low beams and power is supplied:
^ through combination switch terminal (15)
^ to LH headlamp terminal (1), and
^ through combination switch terminal (13)
^ to RH headlamp terminal (1) and
^ combination meter terminal (6) for the HIGH BEAM indicator.
Ground is supplied to combination meter terminal (12) through body grounds (M5) , (M78) and (M123).
Ground is supplied to each headlamp terminal (2) through body grounds (E3) , (E14) and (E53) . With power and ground supplied, the high beams and the HIGH BEAM indicator will illuminate until the combination switch is released from the PASS ("C") position.