System Description (For Canada)

The headlamp system for Canada vehicles contains a daytime light control unit 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 15 A fuse (No. 32, located in the fuse and fusible link box)
^ to daytime light control unit terminal 3 and
^ to lighting switch terminal 8.

Power is also supplied at all times:
^ through 15 A fuse (No. 33, located in the fuse and fusible link 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 10 A fuse [No. 8, 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 10 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 E9 and E28.

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 headlamp RH terminal 3
^ to daytime light control unit terminal 4.

Ground is supplied to headlamp RH terminal 2 through body grounds E9 and E28.
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 headlamp LH terminal 3.

Ground is supplied:
^ to headlamp LH terminal 2
^ from daytime light control unit terminal 7
^ through daytime light control unit terminal 9
^ through body grounds E9 and E28.

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 headlamp RH.

Also, 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 29 for the high beam indicator
^ through daytime light control terminal 6
^ to terminal 1 of headlamp LH.

Ground is supplied in the same manner as low beam operation.

Ground is supplied to terminal 27 of the combination meter through body grounds M15, M71 and M76.
With power and ground supplied, the high beam head lamps and HI BEAM indicator illuminate.

DAYTIME LIGHT OPERATION
With the engine running, the lighting switch in the "OFF" or 1ST position and parking brake released, power is supplied:
^ to daytime light control unit terminal 3
^ through daytime light control unit terminal 6
^ to terminal 1 of headlamp LH
^ through terminal 2 of headlamp LH
^ to daytime light control unit terminal 7
^ through daytime light control unit terminal 8
^ to terminal 1 of headlamp RH.

Ground is supplied to terminal 2 of headlamp RH through body grounds E9 and E28.
Because the high beam head lamps are now wired in series, they operate at half illumination.