Wiper and Washer Systems: Description and Operation
WIPER OPERATIONWith the ignition switch in the ACC or ON position, power is supplied
^ through 20 A fuse [No. (20), located in the fuse block (J/B)]
^ to front wiper motor terminal (4)
Low and high speed wiper operation
Ground is supplied to front wiper switch terminal (17) through body grounds (E5) and (E30).
When the front wiper switch is placed in the LO position, ground is supplied
^ through terminal (14) 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 (16) of the front wiper switch
^ to front wiper motor terminal (3).
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 (14) 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 (13) of the front wiper switch,
^ to front wiper relay terminal (3)
^ through terminal (4) of the front wiper relay,
^ to front wiper motor terminal (5)
^ through terminal (6) of the front wiper motor, and
^ through body grounds (M13), (M73) and (M111).
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 and the front wiper motor stops.
Intermittent operation
Intermittent operation is controlled by the Body Control Module (BCM).
When the front wiper switch is placed in the INT position, ground is supplied
^ to BCM terminal (33)
^ from front wiper switch terminal (15)
^ through body grounds (E5) and (E30).
The desired interval time is input
^ to BCM terminal (24)
^ from front wiper switch terminal (19).
Based on these two inputs, an intermittent ground is supplied
^ to front wiper relay terminal (2)
^ from BCM terminal (9)
With power and ground supplied, the front wiper relay is activated.
When activated, an intermittent ground is supplied
^ to front wiper motor terminal (2)
^ through the front wiper switch terminal (14),
^ to front wiper switch terminal (13)
^ through front wiper relay terminal (3),
^ to front wiper relay terminal (5)
^ through body grounds (E5) and (E30).
Front wiper motor operates at desired low speeds with BCM terminal (33) grounded.
WASHER OPERATION
With the ignition switch in the ACC or ON position, power is supplied
^ through 20 A fuse [No. (20), located in the fuse block (J/B)],
^ to front washer motor terminal (1).
When the lever is pulled to the WASH position, ground is supplied
^ to washer motor terminal (2), and
^ to Body Control Module (BCM) terminal (34)
^ from terminal (18) to the front wiper switch
^ through terminal (17) of the front wiper switch, and
^ through body grounds (E5) and (E30).
With power and ground supplied, the washer motor operates.
The front wiper motor operates at low speed for about 3 seconds. This feature is controlled by the BCM in the same manner as the intermittent operation.