Description

WIPER SYSTEM

FRONT WIPER
The front wiper/washer system consists of the following features: lo-hi-speed, mist wipers, intermittent wipers and wipe after wash. The front wiper system is only active when the ignition switch is in the RUN/ACC position. The vehicle operator selects the front wiper function using the front wiper switch (a resistive multiplexed stalk switch) which is integral to the Multi-Function Switch. The front wiper switch is hardwired to the Body Control Module (BCM). Upon receiving a wiper switch signal, the BCM sends a PCI Bus message to the Front Control Module (FCM). The FCM controls the ON/ OFF relay, the HIGH/LOW relay and the front and rear washer pump motors.

The Wiper system utilizes the BCM to control the on/off and hi/low relays for the low and hi speed wiper functions, intermittent wiper delay as the switch position changes, pulse wipe, wipe after wash mode and wiper motor functions. The BCM uses the vehicle speed input to double the usual delay time below 10 MPH (16 KPH).

SPEED SENSITIVE INTERMITTENT WIPE MODE
There are 5 individual delay time settings with a minimum delay of 1.7 seconds to a maximum of 18.4 seconds. When the vehicle speed is under 10 MPH (16 KPH), the delay time is doubled, providing a delay range of 3.4 seconds to 36.8 seconds.

PULSE WIPE
When the wiper is in the off position and the driver presses the wash button for more than 0.062 seconds, but less than 0.5 seconds, 2 wipe cycles in low speed mode will be provided.

PARK AFTER IGNITION OFF
Because the wiper relays are powered from the battery, the BCM can run the wipers to park after the ignition is turned off.

WIPE AFTER WASH
When the driver presses the wash button for over 0.5 seconds and releases it, the wiper will continue to run for 2 additional wipe cycles.

REAR WIPER
The rear wiper/washer system consists of the foil owing features: mist wipers, intermittent wipers and wipe after wash. The rear wiper system is only active when the ignition switch is in the RUN/ACC position. The vehicle operator selects the rear wiper function using one of the three buttons on the dash mounted rear wiper switch. The rear wiper switch is hardwired to the Body Control Module (BCM). Upon receiving a wiper switch signal, the BCM provides 12 volts to the rear wiper motor. Rear washer occurs when the BCM receives a rear washer switch ON input. The BCM sends a PCI Bus message to the FCM requesting rear washer on. The FCM activates the rear washer by providing a high side control for the rear washer motor.

SPEED SENSITIVE INTERMITTENT WIPE MODE
The delay setting of the rear wiper system is based solely on the vehicle speed. The delay time is defined as the amount of time from the start of a wipe to the beginning of the next wipe. The rear wiper system delay time is based on the following:

7.75 - (MPH x 0.05) = Seconds delay

Examples:
At zero (0) MPH the delay is 7.75 seconds.
At 100 MPH the delay is 2.75 seconds.

WIPE AFTER WASH
When the driver presses the wash button for over 1.5 seconds and releases it, the wiper will continue to run for 2 additional wipe cycles.