Rear Wiper Module

Fig. 14 Rear Wiper Module:

REAR WIPER MODULE
The rear wiper module is concealed within the lift-gate, below the liftgate flip-up glass and behind the liftgate inner trim panel. The end of the motor output shaft that protrudes through the lift- gate outer panel to drive the rear wiper arm and blade is the only visible component of the rear wiper module. A rubber gasket, a bezel, and a nut secure and seal the motor output shaft to the liftgate outer panel. A molded plastic nut cover snaps onto the bezel to conceal the nut and improve appearance. An integral connector receptacle connects the rear wiper module to the vehicle electrical system through a dedicated take out and connector of the liftgate wire harness. The rear wiper module consists of the following major components:

- Bracket - The rear wiper module bracket consists of a stamped steel mounting plate for the wiper motor that is secured with screws through two rubber insulators to the liftgate inner panel.

- Electronic Controls - The rear wiper module electronic controls include the rear wiper system electronic logic and rear wiper motor electronic controls. The electronic controls for the motor include an electronic speed control that speeds the wiper blade near the center of the glass, but slows the wiper blade during directional reversals at each end of the wipe pattern and during wiper blade off-the-glass parking for quieter operation.

- Motor - The permanent magnet rear wiper motor is secured with screws to the rear wiper module bracket. The wiper motor includes an integral transmission, and the motor output shaft.

The rear wiper module cannot be adjusted or repaired. If any component of the module is faulty or damaged, the entire rear wiper module unit must be replaced. The motor output shaft gasket, bezel, nut, and nut cover are available for individual service replacement.

The rear wiper module receives non-switched battery current through a fuse in the Junction Block (JB) on a fused B(+) circuit and is connected to ground at all times. The rear wiper module operation is controlled by the vehicle operator through battery current signal inputs received by the rear wiper module electronic controls from the rear wiper switch circuitry of the right (wiper) multi-function switch on the steering column. The module also receives an external control input from the liftgate flip-up glass ajar switch circuit. If the rear wiper module senses that the flip-up glass is ajar, it will not allow the rear wiper motor to operate.

The rear wiper module electronic control logic uses these inputs, its internal inputs, and its programming to provide a continuous wipe mode, an intermittent wipe mode, a wipe-after-wash mode, and off-the-glass wiper blade parking. The wiper blade cycling is controlled by the internal electronic controls of the module. The module controls current flow to the wiper motor brushes and provides an electronic speed control that speeds the wiper blade near the center of the glass, but slows the wiper blade during directional reversals at each end of the wipe pattern and during wiper blade off-the-glass parking for quieter operation.

The 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 liftgate flip-up glass. The rear wiper module may be diagnosed using conventional diagnostic tools and methods.