Wiper and Washer Systems: Description and Operation

The wiper and washer circuits are protected by fuse F20 located in the central junction box.

Front wiper system
The front wiper system consists of the following components:
^ Two wiper arms.
^ Two wiper blades.
^ Wiper motor.
^ Wiper arm linkage.
^ Wiper relay, located in the Central Junction Box (CJB).
^ Central Timer Module (CTM), located in the CJB.
^ Multifunction switch, incorporating
- front and rear wiper switch
- front and rear washer switch
- delay control rotary switch.

Rear wiper system
The rear wiper system (dependent on model) consists of the following components:
^ Wiper arm
^ Wiper blade
^ Wiper motor
^ Multifunction switch, incorporating
- front and rear wiper switch
- front and rear washer switch delay control rotary switch.

Windshield washer

WARNING: WASHER FLUID CONTAINS THE POISONOUS SUBSTANCE METHANOL. OBSERVE THE SAFETY RULES. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

CAUTION: Operate the washer for a maximum of 10 seconds. Do not operate with an empty washer reservoir.

The windshield washer system consists of following components:
^ Washer reservoir, underneath the right-hand front fender
^ Washer pump for windshield washer and rear window washer, on the outside of the washer reservoir
^ Two adjustable washer nozzles on the hood
^ Multifunction switch, incorporating
- front and rear wiper switch
- front and rear washer switch
- delay control rotary switch.

Rear window washer system
The rear window washer system consists of following components:
^ Washer reservoir, underneath the right-hand front fender
^ Washer pump for windshield washer and rear window washer, on the outside of the washer reservoir
^ One adjustable washer nozzle on the liftgate
^ Multifunction switch, incorporating
- front and rear wiper switch
- front and rear washer switch
- delay control rotary switch.

PRINCIPLES OF OPERATION
The windshield wiper motor is a two speed motor that uses the motor case as the path to ground. The motor contains a park switch. This park switch switches between a path to ground when the motor is in the park position and a 12 V potential when the motor is turning.

When the multifunction switch is in the low and high speed position, the windshield wiper motor receives voltage from fuse 20, directly through the multifunction switch. When the multifunction switch is in the intermittent position, single wipe position, or when the front windshield wiper is reaching the park position, the windshield wiper motor receives voltage by the CTM controlling the windshield wiper relay, allowing voltage to pass through the multifunction switch to the windshield wiper motor.

When the multifunction switch is in the intermittent position the windshield wiper motor is controlled by the CTM. The CTM determines the position of the variable intermittent wipe position of the multifunction switch to determine the amount of time between wipes of the windshield wiper. When appropriate, the CTM then grounds the coil side of the windshield wiper relay, to actuate the windshield wiper motor.

The washer pump is used for both windshield washers and rear window washer. With the multifunction switch in wipe/wash position the ground path for the washer pump is through the CTM and voltage through the multifunction switch. With the multifunction switch in the windshield wiper position both ground and voltage are supplied by the multifunction switch. With the multifunction switch in the rear washer position voltage and ground are applied to the washer pump with opposite polarity. The washer pump will turn in the opposite direction.

The rear window wiper motor is a single speed motor that uses its case for a ground. The motor only receives voltage from the multifunction switch.