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
- Remove the wiper arms from the vehicle using the procedure found earlier in this section.
- 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.
- Detach the connectors from the wiper motor assembly.
- Remove the three screws and the wiper drive system module from the vehicle.
- 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.
- Remove the nut from the wiper motor crank arm.
- Remove the three screws and separate the wiper motor from the tube frame.
- Install the wiper motor assembly and bracket onto the tube frame with three screws. Tighten to 106 inch lbs. (12 Nm).
- Install the wiper motor crank arm onto the wiper motor assembly with the nut and tighten to 18 ft. lbs. (25 Nm).
- Snap together the wiper motor crank arm onto the wiper transmission. GM recommends their tool J 39529. Use care if using substitutes.
- Install the wiper drive system module onto the vehicle and tighten the three screws to 106 inch lbs. (12 Nm).
- Assemble the electrical connectors and verify that they are secure.
- 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.
- Install the wiper arms to the vehicle.