Wiper Control Module: Description and Operation

Fig. 4 Intermittent Wipe Module:

INTERMITTENT WIPE MODULE
An intermittent wipe module is used on vehicles that are not equipped with the optional Vehicle Theft Security System (VTSS). The intermittent wipe module is concealed under the instrument panel, where it is secured to the tab of a stamped steel blade-type mounting bracket that is welded to the underside of the instrument panel cross body structural support above the glove box opening. The intermittent wipe module is enclosed within a molded plastic housing with an integral external connector receptacle that connects it to the vehicle electrical system through a take out and connector of the instrument panel wire harness. A mounting slot that is also integral to the intermittent wipe module housing slides over and snaps onto the tab of the mounting bracket.

The intermittent wipe module utilizes integrated circuitry and hard wired inputs from the wiper and washer switch circuitry of the multi-function switch and the wiper park switch within the wiper motor to provide the intermittent wipe system delay and wipe-after-wash features of the intermittent wipe system through a hard wired output to the low speed brush of the wiper motor. The intermittent wipe module cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The intermittent wipe module contains integrated circuitry that allows it to monitor hard wired inputs from the wiper switch and washer switch circuitry within the multi-function switch and the park switch circuitry within the wiper motor. In response to those inputs, the internal circuitry of the intermittent wipe module provides control outputs to the low speed brush of the wiper motor. The intermittent wipe delay time selected by the driver provides a resistor multiplexed output to the intermittent wipe module, and an electronic timer circuit within the intermittent wipe module is used to accomplish the selected delay interval. If the washer system is activated while the wiper system is turned OFF, the intermittent wipe module will operate the wiper motor for approximately three wipes, then turn the wiper motor OFF.

Because of the active electronic elements within the intermittent wipe module, it cannot be tested with conventional automotive electrical test equipment. If the intermittent wipe module is believed to be faulty, the hard wired input and output circuits of the module should be tested, then replace the module with a known good unit to confirm system operation.