Grand Cherokee 2WD V8-4.7L VIN J (2004)
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Intermittent Rear Wipe Mode - The internal circuitry and hardware of the right (wiper) multi-function switch control ring provide one fixed
interval intermittent rear wipe mode switch position.
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Rear Washer Mode - The internal circuitry and hardware of the right (wiper) multi-function switch control stalk provide rear washer system
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 Junction Block (JB)
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.
Following are descriptions of how the right (wiper) multi-function switch control stalk operates to control the functions and features it provides:
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Automatic Wipe Mode - On models equipped with the optional automatic wiper system, 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 automatic wipe sensitivity level. The
control knob is rotated rearward (counterclockwise) to reduce the sensitivity (increase the interval between wipes), or forward (clockwise) to
increase the sensitivity (decrease the interval between wipes). 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 sending an electronic message to the Rain Sensor
Module (RSM) over the Programmable Communications Interface (PCI) data bus indicating the selected sensitivity level, and by operating the
front wiper system based upon electronic wipe commands received from the RSM over the PCI data bus.
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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
energizing the wiper on/off relay in the Power Distribution Center (PDC) 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 energizing the wiper
on/off relay and the wiper high/low relay in the PDC for the front high speed continuous wipe mode.
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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.
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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 on a washer pump motor switch output circuit to
energize the front washer pump in the front washer mode.
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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 by energizing the wiper on/off relay in the Power Distribution Center (PDC) to operate the front wiper motor
momentarily at low speed to provide the front wiper mist mode.
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Intermittent Front Wipe Mode - On models not equipped with the optional automatic wiper system, 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 Powertrain Control Module (PCM) over the
Programmable Communications Interface (PCI) data bus, then energizing the wiper on/off relay in the Power Distribution Center (PDC) to operate
the front wiper motor at the proper delay intervals.
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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.
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Rear Washer Mode - The right (wiper) multi-function switch control stalk is pushed forward toward the instrument panel to a momentary
positions 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 provides battery current on a rear washer pump motor control circuit to
energize the rear washer pump in the rear washer mode.
