GM Century/Lumina/Grand Prix/Intrigue 1997-2000

Windshield Wiper Motor

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The windshield wiper/washer system consists of a permanent-magnet depressed-park wiper motor assembly, wiper/washer switch, washer solvent container with a pump, wiper arms and blade assemblies and a wiper drive system (also called a wiper transmission). The wiper drive system is installed on the vehicle as a complete assembly called a module. The wiper drive system module consists of a wiper motor assembly and wiper transmission assembly assembled on a tube frame.

The wiper/washer system is a pulse (delay) type. Pulse timing and demand wash functions are controlled electronically. The pulse type windshield wiper/washer system includes an operating mode in which the wipers make single sweeps with an adjustable time interval between sweeps. The time interval is controlled by a solid state timer in the wiper motor cover assembly. The duration of the delay interval is determined by the delay resistor in the wiper/washer switch assembly. The length of delay time between sweeps is controlled by the variable pulse delay resistor. The delay is adjustable from 0 to 25 seconds.

REMOVAL & INSTALLATION



  1. Remove the wiper arms from the vehicle using the procedure found earlier in this section.
  2.  
  3. Remove the air inlet grille panel retaining screws (or plastic push-in retainers) and remove the panel from the vehicle. The panel may be in two pieces, left side and right side.
  4.  
  5. Detach the connectors from the wiper motor assembly.
  6.  
  7. Remove the three screws and the wiper drive system module from the vehicle.
  8.  
  9. The wiper motor crank arm is attached to the wiper drive by a ball-joint type connection that snaps together. GM recommends their special tool J 39232 which is a pliers-like tool with U-shaped jaws that are placed between the components. When the handles are squeezed, the jaws separate the components. Use care if using substitutes.
  10.  
  11. Remove the nut from the wiper motor crank arm.
  12.  
  13. Remove the three screws and separate the wiper motor from the tube frame.
  14.  



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Fig. Exploded view of a typical W-Body windshield wiper motor and related components



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Fig. Separating the wiper linkage using GM's special tool



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Fig. Assembling the wiper linkage using GM's special tool



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Fig. Transmission/linkage socket screw and related components



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Fig. View of the transmission assembly



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Fig. Use a suitable tool line up the holes in the module carrier plate and bell crank.

To install

  1. Install the wiper motor assembly and bracket onto the tube frame with three screws. Tighten to 106 inch lbs. (12 Nm).
  2.  
  3. Install the wiper motor crank arm onto the wiper motor assembly with the nut and tighten to 18 ft. lbs. (25 Nm).
  4.  
  5. Snap together the wiper motor crank arm onto the wiper transmission. GM recommends their tool J 39529. Use care if using substitutes.
  6.  
  7. Install the wiper drive system module onto the vehicle and tighten the three screws to 106 inch lbs. (12 Nm).
  8.  
  9. Assemble the electrical connectors and verify that they are secure.
  10.  
  11. Install the air inlet grille panel. Use care to align the clearance holes to the wiper arm pivot shafts. If the grilles are in two pieces, look for a small connecting pin which aligns the two pieces and make sure it is correctly registered into its mating opening.
  12.  
  13. Install the wiper arms to the vehicle.
  14.  

 
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