Wash Mode

When the control stalk of the right (wiper) multi-function switch is pulled rearward to the front momentary 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 FCM, which directs battery current and ground to the washer pump/motor. This will cause the washer pump/motor to be energized for as long as the WASH switch is held closed and to be de-energize when the control stalk is released.

When the control stalk is pulled rearward to the front momentary WASH position while the front wiper system is operating in one of the DELAY interval (or sensitivity level with automatic wipers) positions, the washer pump/motor operation is the same. However, the FCM also energizes the wiper on/off relay to override the selected delay interval or sensitivity level and operate the front wiper motor in a continuous low speed mode for as long as the control stalk is held in the momentary WASH position, then de-energizes the relay and reverts to the selected delay interval or sensitivity level several wipe cycles after the control stalk is released. If the WASH switch is held closed for more than about 10 seconds, the FCM will suspend washer pump/motor operation until the control stalk is released for about 2 seconds, then cycled back to the WASH position.