For USA

Power is supplied at all times
^ through 15 A fuse (No. (53), located in the fuse and fusible link box)
^ to headlamp relay LH terminals (1) and (3),
^ through 15 A fuse (No. (54), located in the fuse and fusible link box)
^ to headlamp relay RH terminals (1) and (3),
^ through 15 A fuse (No. (66), located in the fuse and fusible link box)
^ to tail lamp relay terminals (1) and (3)
When the ignition switch is in the ON or START position, power is supplied
^ through 7.5 A fuse (No. (12), located in the fuse block (J/B)]
^ to auto light control unit terminal (2).
Ground is supplied
^ to auto light control unit terminal (5)
^ through body grounds (M73), (M103) and (M13, and
^ to the lighting switch terminals (8) and (5)
^ through body grounds (E5) and (E30).

HEADLAMP SWITCH OPERATION
Low beam operation

When the lighting switch is turned to 2ND and "LOW BEAM" (B) positions, ground is supplied
^ to headlamp relay LH and RH terminals (2)
^ from the lighting switch terminal (12).
Headlamp relay is then energized, and power is supplied
^ from headlamp relay LH terminal (5)
^ to terminal (3) of the LH headlamp, and
^ from headlamp relay RH terminal (5)
^ to terminal (3) of the RH headlamp.
Ground is supplied
^ to terminal (2) of the LH headlamp
^ from the lighting switch terminal (7), and
^ to terminal (2) of the RH headlamp
^ from the lighting switch terminal (10).
With power and ground supplied, the low beam headlamps illuminate.

High beam operation/flash-to-pass operation

When the lighting switch is turned to 2ND and HIGH ("A") or PASS ("C") positions, ground is supplied
^ to headlamp relay LH and RH terminals (2)
^ from the lighting switch terminal (12).
Headlamp relays are then energized, and power is supplied
^ from headlamp relay LH terminal (5)
^ to terminal (3) of the LH headlamp, and
^ to combination meter terminal (21) for the HIGH BEAM indicator
^ from headlamp relay RH terminal (5)
^ to terminal (3) of the RH headlamp.
Ground is supplied
^ to terminal (1) of the LH headlamp, and
^ to combination meter terminal (20)
^ from the lighting switch terminal (6)
^ to terminal (1) of the RH headlamp
^ from the lighting switch terminal (9)
With power and ground supplied, the high beam headlamps illuminate.