Switch, MULTIFUNCTION, Right: Operation

The right (wiper) multifunction switch uses hardwired digital outputs to control the many functions and features it provides using a minimal number of hardwired circuits. The switch receives power and ground from the microcontroller of the Steering Column Control Module (SCCM), then provides digital outputs to the SCCM microcontroller to indicate the selected switch positions. The SCCM microcontroller then sends electronic switch status  messages over the Controller Area Network (CAN) data bus to the Body Control Module (BCM) and other electronic modules in the vehicle.

If the SCCM microcontroller detects no inputs from the right multifunction switch, it transmits an electronic Signal Not Available (SNA)  status message over the CAN data bus. The SNA status signals the other electronic modules to implement a fail-safe or default mode of operation for the front and rear wiper systems. The fail-safe mode will maintain the last selected front and rear wiper system operation for the remainder of the current ignition cycle, after which both wiper systems will default to OFF.

Following are descriptions of how the right multifunction switch is operated to control the many front and rear wiper and washer system functions and features it provides:

• Front Washer Control  - The right multifunction switch control stalk is pulled rearward towards the steering wheel to a momentary WASH position to activate the washer pump/motor in the front washer mode. The washer pump/motor will continue to operate for as long as the control stalk is held in this position. The SCCM microcontroller reads the digital input from the right multifunction switch and sends an electronic front washer switch status  message over the CAN data bus to the BCM and to other electronic modules in the vehicle.
• Front Wiper Control  - The control knob on the end of the right multifunction switch control stalk is rotated to one of the two continuous wiper detent positions (LO or HI), to one of four intermittent delay or sensitivity wiper detent positions, or to the OFF position to select the front wiper mode. The SCCM microcontroller reads the digital input from the right multifunction switch and sends electronic front wiper switch status  messages over the CAN data bus to the BCM and to other electronic modules in the vehicle.
• Front Wiper Mist Mode  - The right multifunction switch control stalk is lifted upward to a momentary MIST position to activate the front wiper MIST mode. The front wiper motor will continue to operate, one complete cycle at a time, for as long as the control stalk is held in this position. The SCCM microcontroller reads the digital input from the right multifunction switch and sends an electronic front wiper switch status  message over the CAN data bus to the BCM and to other electronic modules in the vehicle.
• Rear Washer Control  - The right multifunction switch control pushed forward away from the steering wheel to the momentary WASH positions to activate the washer pump/motor in the rear washer mode. The washer pump/motor will continue to operate in the rear washer mode for as long as the control stalk is held in this position. The SCCM microcontroller reads the digital input from the right multifunction switch and sends an electronic rear washer switch status  message over the CAN data bus to the BCM and to other electronic modules in the vehicle.
• Rear Wiper Control  - The rear wiper mode is selected when the right multifunction switch control sleeve is rotated to the fixed interval intermittent rear wipe detent ON position. The SCCM microcontroller reads the digital input from the right multifunction switch and sends an electronic rear wiper switch status  message over the CAN data bus to the BCM and to other electronic modules in the vehicle.