2007 Grand Cherokee WK Factory Service Manual 8 - ELECTRICAL

WIPER MODULE

DESCRIPTION



The front wiper module is secured to the cowl plenum panel beneath the cowl plenum cover/grille panel. The ends of the wiper pivot shafts protrude through dedicated openings in the cowl plenum cover/grille panel to drive the wiper arms and blades and are the only visible components of the front wiper module.

The wiper module consists of the following major components:

  • Bracket - The wiper module bracket (1) consists of a long tubular steel main member that has a stamped pivot bracket formation near each end where the two wiper pivots (2) are secured. The wiper module bracket is secured within the cowl plenum by two screws and a stud and nut through three rubber insulators (3). A stamped steel mounting plate (6) for the wiper motor (4) is secured with welds near the center of the main member.
  • Crank Arm - The wiper motor crank arm (5) is a stamped steel unit with a slotted hole on the driven end that is secured to the wiper motor output shaft with a nut, and has a long ball stud secured to the drive end to accept the wiper linkage.
  • Linkage - Two stamped steel drive links (7) connect the wiper motor crank arm to the wiper pivot lever arms (8). The right side drive link has a plastic socket-type bushing on each end. The left side drive link has a plastic socket-type bushing on one end, and a plastic sleeve-type bushing on the other end. The socket-type bushing on one end of each drive link is snap-fit over the ball stud on the lever arm of its respective pivot. The left side drive link sleeve-type bushing end is then fit over the motor crank arm ball stud, and the other socket-type bushing of the right side drive link is snap-fit over the exposed end of the wiper motor crank arm ball stud.
  • Motor - The wiper motor is secured with three bolts to the motor mounting plate near the center of the wiper module bracket. The wiper motor output shaft passes through a hole in the module bracket, where a nut secures the wiper motor crank arm to the motor output shaft. The two-speed permanent magnet wiper motor features an integral transmission, an internal park switch, and an internal automatic resetting circuit breaker.
  • Pivots - The two front wiper pivots are secured to the ends of the wiper module bracket. The lever arms that extend from the bottom of the pivot shafts each have a ball stud on their end. The upper end of each pivot shaft where the wiper arms will be fastened each is tapered and serrated with a threaded stud formation at the tip.

The front wiper module cannot be adjusted or repaired. If any component of the module is ineffective or damaged, the entire front wiper module unit must be replaced.

OPERATION

The front wiper module operation is controlled by the battery current inputs received by the wiper motor through the wiper on/off and wiper high/low relays. The wiper motor speed is controlled by current flow to either the low speed or the high speed set of brushes. The park switch is a single pole, single throw, momentary switch within the wiper motor that is mechanically actuated by the wiper motor transmission components. The park switch alternately closes the wiper park switch sense circuit to ground or to battery current, depending upon the position of the wipers on the glass. This feature allows the motor to complete its current wipe cycle after the wiper system has been turned OFF, and to park the wiper blades in the lowest portion of the wipe pattern. The automatic resetting circuit breaker protects the motor from overloads.

The wiper motor crank arm, the two wiper linkage members, and the two driven wiper pivots mechanically convert the rotary output of the wiper motor to the back and forth wiping motion of the wiper arms and blades on the glass.

The hard wired inputs and outputs of the front 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 front wiper motor or the electronic controls or communication between other modules and devices that provide some features of the front wiper and washer system. The most reliable, efficient, and accurate means to diagnose the front wiper motor or the electronic controls and communication related to front wiper motor operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

REMOVAL




1. Disconnect and isolate the battery negative cable.
2. Remove both front wiper arms from the wiper pivots. (Refer to 8 - ELECTRICAL/WIPERS/WASHERS/WIPER ARM - REMOVAL - FRONT).
3. Remove the cowl plenum cover/grille panel from over the front wiper module. (Refer to 23 - BODY/EXTERIOR/COWL GRILLE - REMOVAL).
4. Remove the nut (1) that secures the inboard end of the front wiper module bracket to the stud in the cowl plenum.
5. Remove the two screws (2) that secure the module bracket to the cowl plenum.
6. Disconnect the wire harness connector (4) from the connector for the front wiper motor (3).
7. Remove the wiper module from the cowl plenum.

INSTALLATION




1. Position the front wiper module into the cowl plenum.
2. Reconnect the wire harness connector (4) to the connector for the front wiper motor (3).
3. Position the mount on the inboard end of the wiper module onto the stud within the cowl plenum.
4. Loosely install the nut (1) and the two screws (2) that secure the wiper module within the cowl plenum.
5. Working from left to right, tighten the two screws and the nut to 6 N·m (55 in. lbs.).
6. Reinstall the cowl plenum cover/grille panel over the front wiper module. (Refer to 23 - BODY/EXTERIOR/COWL GRILLE - INSTALLATION).
7. Reinstall both front wiper arms onto the wiper pivots. (Refer to 8 - ELECTRICAL/WIPERS/WASHERS/WIPER ARM - INSTALLATION - FRONT).
8. Reconnect the battery negative cable.