Front Wiper and Washer System Description

WIPER OPERATION
With the ignition switch in the ACC or ON position, power is supplied
^ through 2O A fuse [No. (12) located in the fuse block (J/B)]
^ to wiper amp. terminal (5)
^ through terminal (12) to the front wiper switch
^ to wiper amp. terminal (1).
Then wiper amp. is energized and power is supplied
^ through wiper amp. terminal (4)
^ to front wiper motor terminal (3).

Low and high speed wiper operation
Ground is supplied to front wiper switch terminal (14) through body grounds (E13) and (E22).
When the front wiper switch is placed in the LO position, ground is supplied
^ through terminal (11) of the front wiper switch
^ to front wiper motor terminal (2).
With power and ground supplied the front wiper motor operates at low speed.
When the front wiper switch is placed in the HI position, ground is supplied
^ through terminal (13) of the front wiper switch
^ to front wiper motor terminal (1).
With power and ground supplied the front wiper motor operates at high speed.

Auto stop operation
When the front wiper switch is placed in the OFF position, the front wiper motor will continue to operate until the wiper arms reach the base of the windshield (Auto stop).
When the front wiper switch is placed in the OFF position, ground is supplied
^ from terminal (11) of the front wiper switch
^ to front wiper motor terminal (2), in order to continue front wiper motor operation at low speed.
Ground is also supplied until the wiper arms reaches the base of the windshield
^ through terminal (10) of the front wiper switch
^ to wiper amp. terminal (2)
^ through terminal (7) of the wiper amp.
^ to front wiper motor terminal (5)
^ through terminal (4) of the front wiper motor, and
^ through body grounds (E13) and (E22).
When the wiper arms reach the base of the windshield, the switch in the front wiper motor moves to the "STOP" position. The ground path is interrupted, the wipers return to the resting position and the front wiper motor stops.

Intermittent operation
Intermittent operation is controlled by the time control unit.
When the front wiper switch is placed in the INT position, ground is supplied
^ to time control unit terminal (12)
^ from front wiper switch terminal (12)
^ through body grounds (M3) and (M90).
The desired interval time is input
^ to time control unit terminal (14)
^ from front wiper switch terminal (17).
Based on these two inputs, an intermittent ground is supplied
^ to wiper amp. terminal (6)
^ from time control unit terminal (1).
With power and ground supplied, the wiper amp. is activated.
When activated, an intermittent ground is supplied
^ to front wiper motor terminal (2)
^ through the front wiper switch terminal (11)
^ to front wiper switch terminal (10)
^ through wiper amp. terminal (2)
^ to wiper amp. terminal (3)
^ through body grounds (E13) and (E22).
Front wiper motor operates at desired low speeds with time control unit terminal (12) grounded.

Rising up operation
When the front wiper switch is placed in the INT, LO or HI position, ground is supplied
^ through terminal (12) of the front wiper switch
^ to wiper amp. terminal (1).
Then wiper amp. is energized and power is supplied
^ through wiper amp. terminal (4)
^ to front wiper motor terminal (3).
Ground is supplied to front wiper motor through front wiper switch and body grounds (M3) and (M90). With power and ground supplied, front wiper motor operates and wiper arms move up.
Wipers do not stop and return to resting position if speed is changed between intermittent, low speed and high speed. Operation continues, but at newly selected speed.

WASHER OPERATION
With the ignition switch in the ACC or ON position, power is supplied
^ through 2O A fuse [No. (12), located in the fuse block (J/B)]
^ to front washer motor terminal (1).
When the switch is pushed to the WASH position, ground is supplied
^ to washer motor terminal (2), and
^ to time control unit terminal (13)
^ from terminal (15) of the front wiper switch
^ through terminal (14) of the front wiper switch, and
^ through body grounds (M3) and (M90).
With power and ground supplied, the washer motor operates.
At the same time the front wiper motor operates at low speed for about 3 seconds. This feature is controlled by the time control unit in the same manner as the intermittent operation.