Wiper Operation

The wiper switch is controlled by a lever built into the combination switch.
There are three wiper switch positions:
^ LO speed
^ HI speed
^ INT (Intermittent)
With the ignition switch in the ACC or ON position, power is supplied:
^ through 20 A fuse (No. (11) located in the fuse block)
^ to wiper motor terminal (4)

Low and high speed wiper operation
Ground is supplied to wiper switch terminal (17) through body grounds (E12) and (E37)
When the wiper switch is placed in the LO position, ground is supplied:
^ through terminal (14) of the wiper switch
^ to wiper motor terminal (2).
With power and ground supplied the wiper motor operates at low speed.
When the wiper switch is placed in the HI position, ground is supplied:
^ through terminal (16) of the wiper switch
^ to wiper motor terminal (3)
With power and ground supplied the wiper motor operates at high speed.

Auto stop operation
When the wiper switch is placed in the OFF position the wiper motor will continue to operate until the wiper arms reach the base of the windshield.
When the wiper switch is placed in the OFF position ground is supplied:
^ from terminal (14) of the wiper switch
^ to wiper motor terminal (2) in order to continue wiper motor operation at low speed.
The ground path to terminal (14) of the wiper switch is supplied:
^ through terminal (13) of the wiper switch
^ to wiper relay terminal (3)
^ through terminal (4) of the wiper relay
^ to wiper motor terminal (5)
^ through terminal (6) of the wiper motor and
^ through body grounds (M51), (M76) and (M77).
The ground path is interrupted and the wiper motor stops when the wiper arms reach the base of the windshield.

Intermittent operation
Intermittent operation can be set or variable depending on the model option. The wiper motor operates the wiper arms one time at low speed at a set interval of approximately 1 to 20 seconds. This feature is controlled by the time control unit.
When the wiper switch is placed in the INT position ground is supplied:
^ to time control unit terminal (1)
^ from wiper switch terminal (15)
^ through body grounds (E12) and (E27).
The desired interval time is input:
^ to time control unit terminal (4)
^ from wiper switch terminal (19).
Based on these two inputs an intermittent ground is supplied:
^ to wiper relay terminal (2)
^ from time control unit terminal (13).
With power and ground supplied the wiper relay is activated.
When activated an intermittent ground is supplied:
^ to wiper motor terminal (2)
^ through the wiper switch terminal (14)
^ to wiper switch terminal (13)
^ through wiper relay terminal (3)
^ to wiper relay terminal (5)
^ through body grounds (E12) and (E37)
The wiper motor operates at low speed at the desired time interval.