System Description (For Canada))

The headlamp system for Canada vehicles contains a daytime light control module that 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 when the parking brake is applied.
Power is supplied at all times
^ through 20 A fuse (No. (39), located in the fusible link and fuse box)
^ to daytime light control unit terminal (3) and
^ to lighting switch terminal (8).
Power is also supplied at all times
^ through 20 A fuse (No. (40), located in the fusible link and fuse box)
^ to daytime light control unit terminal (2) and
^ to lighting switch terminal (5).
With the ignition switch in the ON or START position, power is supplied
^ through 7.5 A fuse (No. (1), located in the fuse block)
^ to daytime light control module terminal (12).
With the ignition switch in the START position, power is supplied
^ through 7.5 A fuse (No. (25) , located in the fuse block)
^ to daytime light control unit terminal (1).
Ground is supplied to daytime light control unit terminal (9) through body grounds (E28) and (E42).

HEADLAMP OPERATION
Low beam operation
When the lighting switch is turned to the 2ND position and placed in LOW ("B") position, power is supplied
^ from lighting switch terminal (7)
^ to RH headlamp terminal (3)
^ to daytime light control unit terminal (4).
Ground is supplied to RH headlamp terminal (2) through body grounds (E28) and (E42).
Also, when the lighting switch is turned to the 2ND position and placed in LOW ("B") position. power is supplied
^ from lighting switch terminal (10)
^ to LH headlamp terminal (3).
Ground is supplied
^ to LH headlamp terminal (2)
^ from daytime light control unit terminal (7)
^ through daytime light control unit terminal (9)
^ through body ground (E28) and (E42).
With power and ground supplied, the low beam headlamps illuminate.

High beam operation/flash-to-pass operation
When the lighting switch is turned to the 2ND position and placed in HIGH ("A") position, power is supplied
^ from lighting switch terminal (6)
^ to terminal (1) of each RH headlamp
^ to daytime light control unit terminal (8).
When the lighting switch is turned to the 2ND position and placed in HIGH ("A") position, power is supplied
^ from lighting switch terminal (9)
^ to daytime light control terminal (5)
^ to combination meter terminal (37) for the high beam indicator
^ through daytime light control terminal (6)
^ to terminal (1) of each LH headlamp.
Ground is supplied in the same manner as low beam operation.
Ground is supplied to terminal (36) of the combination meter through body grounds (M5) and (M57).
With power and ground supplied, the high beam headlamps illuminate.

DAYTIME LIGHT OPERATION
With the engine running and the lighting switch in the OFF position, power is supplied
^ to daytime light control module terminal (3)
^ through daytime light control module terminal (6)
^ to terminal (1) of each LH headlamp
^ through terminal (2) of each LH headlamp
^ to daytime light control module terminal (7)
^ through daytime light control module terminal (8)
^ to terminal (1) of each RH headlamp.
Ground is supplied to terminal (2) of each RH headlamp through body ground (E28) and (E42).
Because the high beam headlamps are now wired in series, they operate at half illumination.