General Description

FRONT
The front wiper system provides the driver with normal wipe (low and high speeds), intermittent wipe, wiper after wash, and pulse wipe functions. The driver selects the wiper function via a resistive multiplexed stalk switch mounted on the steering column. When the wiper is in the on position and the ignition is turned off, the wiper motor will continue to run until it reaches its park position.

Other front wiper system features:

Speed Sensitive Intermittent Wipe Mode - There are 6 individual delay times with a minimum delay of 1/2 second to a maximum of 18 seconds. When the vehicle speed is under 10 MPH, the delay time is doubled providing a range time of from 1 second to 36 seconds.

Pulse Wipe - When the wiper is in the off position and the driver presses the wash button for more than 62 msec but less than 1/2 second, 1 wipe cycle in low speed mode will be provided.

Wiper After Wash Mode - When the driver presses the wash button for over 1/2 second and then releases it, the wiper will continue to run for 2 additional wipe cycles.

REAR
The rear wiper system provides the driver with continuous, intermittent, and wiper after wash functions. The driver selects the wiper function via a resistive multiplexed switch mounted in the HVAC control.

SYSTEM OPERATION
The front and rear wiper/washer systems can be operated only when the ignition switch is in the Accessory or Ignition position. A 40 amp fuse located in the Power Distribution Center (PDC) protects the circuitry of the front wiper system. The rear wiper system is protected by a 20 amp fuse located in the junction block. The washer system is protected by a 6 amp self resetting circuit breaker located in the junction block.

The front wiper/washer system operates in the following modes:
1. Low and high speed normal wipe.
2. Vehicle speed sensitive intermittent wipe.
3. Wash with wipe after wash.
4. Pulse wipe.
5. Park (multi-function switch Off, ignition switch On).

The rear wiper washer system operates in the following modes.
1. Normal wipe.
2. Vehicle speed sensitive intermittent wipe.
3. Wash w/wipe after wash
4. Park (switch Off, ignition switch On).

The front and rear wiper motors have a permanent magnetic field. The front wiper motor speed is controlled by current flow to the appropriate set of brushes. Current flow to the brush sets is controlled by the multi-function switch on the steering column and the Hi/Low speed relay in the PDC. The rear wiper motor operates at a single speed.

The vehicle speed sensitive, six position, front intermittent wiper system is controlled by the Body Control Module (BCM). At vehicle speeds above 10.4 MPH, the intermittent pause range, selected at the multi-function switch, is 0.5 to 18 seconds. At vehicle speeds below 10.4 MPH, the selected pause range is doubled by the BCM; range is from 1 to 36 seconds.

The vehicle speed sensitive rear intermittent wiper system is controlled by switches located in the heating and A/C panel and by the Body Control Module (BCM). At vehicle speeds below 50 mph, the pause is seven seconds. At vehicle speeds above 50 mph, the pause is reduced to five seconds.

The front pulse wipe and the front and rear wipe after wash systems are controlled by the BCM. When the front wash switch is depressed for less than 1/2 second, the BCM will provide one complete wiper cycle in low speed mode. When the front wash switch is depressed for more than 1/2 second or the rear wash button is depressed, the wipe after wash system will provide two additional complete wiper cycles after the wash button is released.

Wiper motor parking is controlled by an independently powered, cam operated switch contained within the wiper motor transmission. When power is removed from the normal operating circuits the motor will continue to operate as long as the park switch is closed. At a predetermined point, the cam will open the park switch and stop the motor.

All electrical components of the wiper and washer system, except the internal park switch, are monitored by the BCM. Component or circuit failure may store a diagnostic trouble code that can be accessed with a suitable scan tool.