Right Multi-Function Switch
RIGHT MULTI-FUNCTION SWITCHDESCRIPTION
The right (wiper) multi-function switch is located on the right side of the steering column, just below the steering wheel. This switch is the primary control for the front and rear wiper and washer systems. The only visible components of the switch are the control stalk (1), control knob (2) and control sleeve (3) that extend through the steering column shrouds on the right side of the column. The remainder of the switch including its mounting provisions and electrical connection are concealed beneath the shrouds.
The switch housing (3) and controls are constructed of molded black plastic. Each of the switch controls has white International Control and Display Symbol graphics applied to it, which clearly identify its many functions. A screw through each of two mounts integral to the switch housing, one each at the top and the bottom, secure the switch to the Steering Column Control Module (SCCM) (2). A single integral interface connector with nine terminal pins is integral to the switch housing and connects the switch directly to the right (lighting) multi-function switch.
The right (wiper) multi-function switch provides the vehicle operator with a control interface for the following wiper and washer system functions:
- Continuous Front Wipers - The right multi-function switch control knob provides detent switching for two continuous front wipe modes, low speed or high speed.
- Intermittent Front Wipers - The right multi-function switch control knob provides detent switching for the intermittent front wipe mode with five minor detent delay interval positions.
- Front Wiper Mist Mode - The right multi-function switch control stalk includes momentary switching of the front wiper motor low speed circuit to provide a mist mode features (sometimes referred to as pulse wipe), which allows the vehicle operator to momentarily operate the front wipers for one or more complete cycles.
- Front Washer Mode - The right multi-function switch control stalk provides momentary switching for control of the front washer system operation.
- Continuous Rear Wipers - The right multi-function switch control sleeve provides detent switching for a single continuous rear wiper mode.
- Intermittent Rear Wipe Mode - The right multi-function switch control sleeve provides detent switching for a single fixed interval intermittent rear wiper mode.
- Rear Washer Mode - The right multi-function switch control sleeve provides two momentary switch positions for control of rear washer system operation.
The right multi-function switch cannot be adjusted or repaired. If any function of the switch is faulty, or if the switch is damaged, the entire switch unit must be replaced.
OPERATION
The right (wiper) multi-function switch uses resistor multiplexing to control the many functions and features it provides using a minimal number of hard wired circuits. The switch provides resistor multiplexed return outputs to indicate the selected switch positions. The switch then sends electronic switch status messages over the Controller Area Network (CAN) data bus to the other electronic modules in the vehicle and provides two hard wired driver outputs to control rear wiper motor operation.
The right multi-function switch can be diagnosed using a diagnostic scan tool and the appropriate diagnostic information.
Following are descriptions of how the right multi-function switch is operated to control the many front and rear wiper and washer system functions and features it provides:
- Front Wiper Control - The control knob on the end of the right multi-function switch control stalk is rotated to one of the two continuous wiper detents, to one of five intermittent wiper or automatic wiper detents, or to the Off position to select the front wiper mode. The right multi-function switch sends electronic switch status messages over the CAN data bus to the other electronic modules in the vehicle.
- Front Wiper Mist Mode - The front wiper mist mode is requested when the right multi-function switch control stalk is depressed downward towards the floor to a momentary position. 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 right multifunction switch sends an electronic switch status message over the CAN bus to the other electronic modules in the vehicle.
- Front Washer Control - The right multi-function switch control stalk is pulled rearward towards the steering wheel to a momentary 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 right multifunction switch sends an electronic switch status message over the CAN bus to the other electronic modules in the vehicle.
- Rear Wiper Control - The rear wiper mode is selected when the right multi-function switch control sleeve is rotated to the continuous rear wipe detent position, the fixed interval intermittent rear wipe detent position, or the off detent position. The right multi-function switch sends an electronic switch status message over the CAN bus to the other electronic modules in the vehicle and provides hard wired signal outputs to the rear wiper motor through two driver circuits.
- Rear Washer Control - The right multi-function switch control sleeve is rotated to one of two momentary positions, either fully forward or fully rearward, to activate the washer pump/motor in the rear washer mode. The washer pump/motor will continue to operate in the rear washer mode until the control sleeve is released. right multi-function switch sends an electronic switch status message over the CAN bus to the other electronic modules in the vehicle and provides hard wired signal outputs to the rear wiper motor through two driver circuits.