Avenger L4-2.4L (2009)
Wiper Switch: Description and Operation
Right Multifunction Switch - Operation
OPERATION
The right (wiper) multi-function switch uses a combination of resistor multiplexing and conventional switching to control the many functions and
features it provides. The switch receives a clean ground from the Steering Control Module (SCM), then provides resistor multiplexed and conventional
analog return outputs to the SCM to indicate the selected switch positions. The SCM then sends electronic switch status messages over a Local Interface
Network (LIN) data bus to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN), and the EMIC relays
electronic wiper and washer switch request messages over the Controller Area Network (CAN) data bus to other electronic modules in the vehicle.
If the SCM detects no inputs from the right multi-function switch, it transmits an electronic Signal Not Available (SNA) status message over the LIN
data bus. The SNA status signals the EMIC to request other electronic modules to implement a fail-safe 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.
The right multi-function switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and
procedures. Refer to the appropriate wiring information. However, the most reliable, efficient and accurate means to diagnose this component requires
the use of a diagnostic scan tool. Refer to 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:
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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 detents, or to the OFF position to select the front wiper mode. The SCM reads the input from the right
multi-function switch and sends electronic wiper switch status messages over the LIN data bus to the EMIC, which relays an electronic wiper
switch request message over the CAN data bus to other electronic modules in the vehicle.
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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 MIST 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 SCM reads the resistor multiplexed input from the right multi-function switch and sends an electronic
wiper switch status message over the LIN data bus to the EMIC, which relays an electronic wiper switch request message over the CAN data bus
to other electronic modules in the vehicle.
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Front Washer Control - The right multi-function 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 SCM reads the resistor multiplexed input from the right multi-function switch and sends an electronic washer
switch status message over the LIN data bus to the EMIC, which relays an electronic washer switch request message over the CAN data bus to
other electronic modules in the vehicle.
