System Description (For Canada)

The Headlamp system for Canada vehicles contains a daytime light control unit. This unit activates the high beam headlamps at approximately half illumination whenever the engine is running. If the parking brake is applied before the engine is started the daytime lights will not be illuminated. The daytime lights will illuminate once the parking brake is released. Thereafter, the daytime lights will continue to operate even when the parking brake is applied.
Power is supplied at all times:
^ through 15 A fuse (No. (39), located in the fusible link and fuse box)
^ to daytime light control unit terminal (2) and
^ to lighting switch terminal (5).
Power is also supplied at all times:
^ through 15 A fuse (No. (40) located in the fusible link and fuse box)
^ to daytime light control unit terminal (3) and
^ to lighting switch terminal (8).
With the ignition switch in the ON or START position, power is supplied:
^ through 7.5 A fuse (No. (7) located in the fuse block [J/B])
^ to daytime light control unit terminal (12).
With the ignition switch in the START position, power is supplied:
^ through 7.5 A fuse (No. (26) located in the fuse block [J/B])
^ to daytime light control unit terminal (1).
Ground is supplied to daytime light control unit terminal (9) through body grounds (M43) , (M44) and (M60).

HEADLAMP OPERATION
Low beam operation
When the lighting switch is moved to the 2ND position and placed in LOW ("B") position (low beam operation), power is supplied:
^ from lighting switch terminal (7)
^ to RH Headlamp terminal (2).
Ground is supplied to RH Headlamp terminal (3) through body grounds (E13) and (E25)
Also when the lighting switch is moved to the 2ND position and placed in LOW ("B") position (low beam operation), power is supplied:
^ from lighting switch terminal (10)
^ to LH Headlamp terminal (2).
Ground is supplied:
^ to LH Headlamp terminal (3)
^ from daytime light control unit terminal (7)
^ through daytime light control unit terminal (9)
^ through body grounds (M43) , (M44) and (M60).
With power and ground supplied, the low beam headlamps illuminate.

High beam operation/Flash-to-pass operation
When the lighting switch is moved to the 2ND position and placed in HIGH ("A") position or the lighting switch is placed in the PASS ("C") position, power is supplied:
^ from lighting switch terminal (6)
^ to RH Headlamp terminal (1), and
^ from lighting switch terminal (9)
^ to daytime light control unit terminal (5), and
^ to combination meter terminal 13 (12) for the HI BEAM indicator
^ through daytime light control unit terminal (6)
^ to LH Headlamp terminal (1)
Ground is supplied in the same manner as low beam operation.
Ground is supplied to terminal 18 (11) of combination meter through body grounds (M43), (M44) and (M60).
With power and ground supplied the high beam headlamps and HI BEAM indicator illuminate.
Terminal numbers in () are for models without tachometer.

DAYTIME LIGHT OPERATION
With the engine running and the lighting switch in the OFF or "1st" position, power is supplied:
^ to daytime light control unit terminal (3)
^ through daytime light control unit terminal (6)
^ to LH Headlamp terminal (1)
^ through LH Headlamp terminal (3)
^ to daytime light control unit terminal (7)
^ through daytime light control unit terminal (8)
^ to RH Headlamp terminal (1).
Ground is supplied to RH Headlamp terminal (3) through body grounds (E13) and (E25).
Because the high beam headlamps are now wired in series, they operate at half illumination.