Wash Mode

When the control knob of the multi-function switch is depressed toward the steering column to the momentary front WASH position for more than about one-half second with the wiper system operating, the SCM sends an electronic washer switch  status message to the SAS, the SAS relays an electronic washer switch  request message to the BCM. Then the BCM directs battery current and ground to the washer pump/motor. This will cause the washer pump/motor to be energized in the front wash direction for as long as the switch is held closed (up to approximately 10 seconds) and to be de-energized when the control knob is released.

When the control knob is depressed to the momentary front WASH position while the front wiper system is operating in one of the DELAY interval positions, the washer pump/motor operation is the same. However, the BCM logic also overrides the selected delay interval and operates the front wiper motor in a continuous low speed mode for as long as the control knob is held in the front momentary WASH position, then reverts to the selected delay interval several wipe cycles after the control knob is released. If the WASH switch is held closed for more than approximately 10 seconds, the BCM will suspend washer pump/motor operation until the control stalk is released for about 2 seconds and then cycled back to the WASH position.