Front Wiper Control
LOW Speed Operation
Wiper switch in the LO position. Power is fed through circuit 343 from the 25 amp front wiper fuse to the Underhood Fuse Block (UHFB) where it goes through the front wiper relay. From the UHFB it travels through circuit 97 to terminal J of the wiper switch. Power flows through the closed contacts of the wiper switch to circuit 95, terminal H through the engine inline terminal C5 (L61), or terminal C1 (L81) to terminal A of the front wiper motor connector. Power flows through the wiper motor to terminal B circuit 150 to the front wiper motor ground.
HIGH Speed Operation
Wiper switch in the HI position. Power is fed through circuit 343 from the 25 amp front wiper fuse to the Underhood Fuse Block (UHFB) where it goes through the front wiper relay. From the UHFB it travels through circuit 97 to terminal J of the wiper switch. Power flows through the closed contacts of the wiper switch to terminal G circuit 92, through the engine inline terminal C4 (L61) or terminal C6 (L81) to terminal E of the front wiper motor connector. Power flows through the wiper motor of terminal B circuit 150 to the front wiper motor ground.
INT/MIST Operation
When intermittent or mist operation of the windshield wiper is selected, battery voltage from the wiper switch is applied to the front wiper input of the body control module (BCM). The BCM responds by switching circuit 1445 to ground. This action energizes the front wiper relay, providing low speed operation of the wiper motor during single swipes.
Control of the wiper during continuous LO or HI speed switch settings is direct wired from the wiper switch to the wiper motor and is not under the control of the BCM.
Intermittent Wiper Delay Operation
The intermittent wiper delay switch is a voltage divider connected across BCM inputs circuit 113 and circuit 96. The wiper relay is energized by the BCM switching circuit 1445 to ground depending on delay switch position.
The intermittent wiper delay switch has 3 switch positions.
| • | Delay 1 -- 2,000 ohms resistance, 1 swipe every 12 seconds |
| • | Delay 2 -- 1,000 ohms resistance, 1 swipe every 7 seconds |
| • | Delay 3 -- 500 ohms resistance, 1 swipe every 2 seconds |
Front Washer Motor
The BCM monitors the front washer motor circuit 228. When a front windshield wash is requested for more than 2 minutes circuit 228 at batter voltage, the BCM will turn OFF the front wiper motor if the front wiper is NOT requested by the wiper switch.
Power for the front washer motor (and rear washer motor if equipped) is supplied through the front wiper fuse and washer switch. Grounding for the front washer motor is through the circuit 550 or through the OFF position of the rear washer motor switch (if equipped).
Rear Washer Motor
The rear washer motor flow is accomplished by reversing the direction of the motor and utilizing a one-way check valve.
The BCM monitors the rear washer motor circuit 392. When a rear windshield wash is requested for more than 2 minutes circuit 392 at battery voltage, the BCM will turn OFF the rear wiper motor if the rear wiper is NOT requested by the wiper switch.
Power for the rear washer motor is supplied through the front wiper fuse and rear washer switch. Grounding for the rear washer motor is through the OFF position of the front washer motor switch.
Rear Wiper Control
When operation of the rear wiper is selected, battery voltage from the rear wiper switch is applied to the rear wiper input of the BCM circuit 94. The BCM responds by switching circuit 1445 to ground. This action energizes the rear wiper relay, providing power to the rear wiper motor.
Wiper Motor Operation
The wiper motor operation is different for the sedan versus the wagon. The sedan is supplied power, which rotates the windshield washer pump in one direction to provide pressure and fluid flow to the front windshield washer nozzles.
The wagon is similar in that when the windshield washer switch is activated for the front windshield washer system, power is supplied to circuit 228 to rotate the windshield washer pump in one direction to provide pressure and fluid flow to the front windshield washer nozzles. When the windshield washer switch is activated for the rear backglass washer system, power is supplied to circuit 392 to rotate the windshield washer pump in the opposite direction to provide pressure and fluid flow to the rear backglass washer nozzle. A mechanical check valve is used to close the port that is not supplied the pressure and fluid flow.
