Right Multi-Function Switch: Operation

The right (wiper) multi-function switch uses resistor multiplexing to control the many functions and features it provides. The switch receives a clean ground from the steering control module (SCM) on a multi-function switch return circuit. It then provides outputs to the SCM on a wash select switch signal circuit to control washer selection and on an intermittent wiper switch signal circuit to control the wipers.

The right (wiper) multi-function switch operates as follows:

• Washer Control  - The control stalk of the right multi-function switch is pulled rearward towards the steering wheel to momentarily activate the windshield washer pump in the front washer mode. The windshield washer pump will continue to operate in the front washer mode until the control stalk is released. The windshield washer pump will operate in the rear washer mode when the knurled control sleeve on the control stalk of the right multi-function switch is rotated to either of the two rear washer mode positions. The multi-function switch provides an output to the SCM, which responds by sending electronic washer switch status messages to the front control module (FCM) over the controller area network (CAN) data bus. The FCM responds by energizing or de-energizing the windshield washer pump in the front or rear washer mode.
• Wiper Control  - The control knob on the end of the 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 rear wiper will operate when the knurled control sleeve on the control stalk of the right multi-function switch is rotated to either the continuous rear wipe position or to the fixed interval intermittent rear wipe position. The multi-function switch provides an output to the SCM, which responds by sending electronic wiper switch status messages to the FCM over the CAN data bus. The FCM responds by energizing or de-energizing the wiper on/off and high/low relays in the integrated power module (IPM) for wiper system control.

The multi-function switch and the multiplexed inputs to the SCM are diagnosed using a diagnostic scan tool (Refer to WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS for more information).