Continuous Wipe Mode

WARNING: This page is about a different car, the 2007 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

When the II (Low) position of the control knob on the control stalk of the multi-function switch is selected, the SCM monitors this selection and sends an electronic wiper switch low status message to the BCM, then the BCM energizes the front wiper on-off relay. This directs battery current through the contacts of the front wiper high-low relay to the low speed brush of the wiper motor, causing the wipers to cycle at low speed.

When the III (High) position of the control knob is selected, the SCM sends an electronic wiper switch high status message to the BCM, then the BCM energizes the front wiper on-off and high-low relays. This directs battery current through the contacts of the both relays to the high speed brush of the wiper motor, causing the wipers to cycle at high speed.

When the 0 (Off) position of the multi-function switch control knob is selected, the SCM monitors this selection and sends an electronic wiper switch off status message to the BCM. If the wiper motor was operating at high speed, the BCM immediately de-energizes the front wiper high-low relay causing the wiper motor to return to low speed operation. Then one of two events will occur. The event that occurs depends upon the position of the wiper blades on the windshield at the moment that the 0 position is selected.

If the wiper blades are in the down position on the windshield when the 0 position is selected, the park switch that is integral to the wiper motor is closed to ground and provides a hard wired park switch sense input to the BCM. The BCM then de-energizes the front wiper on-off relay and the wiper motor ceases to operate. If the wiper blades are not in the down position on the windshield at the moment the 0 position is selected, the park switch is an open circuit and the BCM keeps the front wiper on-off relay energized, which causes the wiper motor to continue running at low speed until the wiper blades are in the down position on the windshield and the park switch input to the BCM is again closed to ground.