Operation

OPERATION

The right (wiper) multi-function switch uses a combination of resistor multiplexed and conventionally switched outputs to control the many functions and features it provides. The switch receives battery current on a fused ignition switch output (run-acc) circuit from a fuse in the Integrated Power Module (IPM) whenever the ignition switch is in the On or Accessory positions, and receives ground from the Body Control Module (BCM) on a windshield wiper switch return circuit. The right (wiper) multi-function switch may be diagnosed using conventional diagnostic tools and methods.

- Continuous Front Wipe Modes - The control knob on the end of the right (wiper) multi-function switch control stalk is rotated to an intermediate detent that is one detent rearward (counterclockwise) from the full forward (clockwise) detent to select the low speed continuous front wiper mode, or to its full forward (clockwise) detent to select the high speed continuous front wiper mode. For the low speed mode, the multi-function switch provides a resistor multiplexed output to the Body Control Module (BCM) on a windshield wiper switch mux circuit, and the BCM responds by sending a bus message to the IPM to energize the wiper on/off relay in the IPM for the front low speed continuous wipe mode. For the high speed mode, the multi-function switch provides the same resistor multiplexed output to the BCM on the windshield wiper switch mux circuit as the low speed mode, but also provides a ground output to the BCM on a wiper high control circuit. The BCM responds to these inputs by sending a bus message to the IPM to energize the wiper on/off relay and the wiper high/low relay in the IPM for the front high speed continuous wipe mode.
- Continuous Rear Wipe Mode - The control ring on the right (wiper) multi-function switch control stalk is rotated to the most forward (clockwise) detent to select the continuous rear wiper mode. The multi-function switch provides a battery current output to the rear wiper motor on a rear wiper motor control circuit to signal the rear wiper module to operate the rear wiper motor in the continuous wipe mode.
- Front Washer Mode - The control stalk of the right (wiper) multi-function switch is pulled toward the steering wheel to momentarily activate the front washer pump/motor in the front washer mode. The front washer pump will continue to operate in the front washer mode until the control stalk is released. The right (wiper) multi-function switch provides a battery current output to the BCM which will in turn send a buss message to the IPM to provide power to the washer pump motor to energize the front washer pump in the front washer mode.
- Front Wiper Mist Mode - The control stalk of the right (wiper) multi-function switch is pushed towards the floor to momentarily activate the front wiper motor in the mist mode. The front wiper motor will continue to operate in the mist mode until the control stalk is released. The right (wiper) multi-function switch provides a resistor multiplexed output to the Body Control Module (BCM) on a windshield wiper switch mux circuit, and the BCM responds sending a bus message to the IPM to energize the wiper on/off relay in the IPM to operate the front wiper motor momentarily at low speed to provide the front wiper mist mode.
- Intermittent Front Wipe Mode - The control knob on the end of the right (wiper) multi-function switch control stalk is rotated to one of five minor intermediate detents to select the desired intermittent front wipe delay interval. The control knob is rotated rearward (counterclockwise) to increase the delay, or forward (clockwise) to decrease the delay. The right (wiper) multi-function switch provides a resistor multiplexed output to the Body Control Module (BCM) on a windshield wiper switch mux circuit. The BCM responds by monitoring electronic vehicle speed messages received from the Next Generation Controller (NGC) over the Programmable Communications Interface (PCI) data bus, then sends a bus message to the IPM to energize the wiper on/off relay in the IPM to operate the front wiper motor at the proper delay intervals.
- Intermittent Rear Wipe Mode - The control ring on the right (wiper) multi-function switch control stalk is rotated to the center detent to select the intermittent rear wiper mode. The right (wiper) multi-function switch provides a battery current output to the rear wiper motor on a rear wiper motor delay control circuit to signal the rear wiper module to operate the rear wiper in the intermittent wipe mode.
- Rear Washer Mode - The right (wiper) multi-function switch control stalk is pushed forward toward the instrument panel to a momentary position to activate the rear washer pump/motor in the rear washer mode. The rear washer pump will continue to operate in the rear washer mode until the control stalk is released. The right (wiper) multi-function switch outputs information to the BCM which will in turn send a bus message to the IPM to energize the rear washer pump motor in the rear washer mode.