Operation

OPERATION

Each rear wiper motor operation is controlled by its integral rear wiper relay, which controls battery current flow to the rear wiper motor based upon control outputs from the Body Control Module (BCM) (also known as the Signal Acquisition and Actuation Module/SAM). The BCM uses internal programming and electronic messages received over the Controller Area Network (CAN) data bus from the Steering Control Module (SCM) to determine when to energize or de-energize the rear wiper relay.

The rear wiper motor park switch is a single pole, single throw, momentary switch within each wiper motor that is mechanically actuated by the wiper motor transmission components. When the rear wiper control sleeve on the multi-function switch control stalk is turned to the 0(OFF) position, or when the BCM is deactivated, the rear wiper motors will continues to operate until the wiper blades reach their park positions. The park switches will then automatically stop rear wiper motor operation. The automatic resetting circuit breakers protect the motors from overloads. The rear wiper motor transmission converts the rotary output of the wiper motor to the back and forth wiping motion of the rear wiper arm and blade on the rear door glass.

The hard wired inputs and outputs of the rear wiper motor may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the rear wiper motor or the electronic controls or communication between other modules and devices that provide some features of the rear wiper and washer system. The most reliable, efficient, and accurate means to diagnose the rear wiper motor or the electronic controls and communication related to rear wiper motor operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.