Windshield Wiper Motor And Linkage Assembly
| ITEM | DESCRIPTION |
|---|---|
| 1 | Pivot crank - left windshield wiper arm |
| 2 | Rubber locating grommet |
| 3 | Main tube |
| 4 | Pivot crank - right windshield wiper arm |
| 5 | Link rod |
| 6 | Motor crank |
| 7 | Link rod |
| 8 | Rubber mounting (2 off) |
| 9 | Pivot - right windshield wiper arm |
| 10 | Pivot - left windshield wiper arm |
| 11 | Electrical connection |
| 12 | Windshield wiper motor |
The windshield wiper motor and linkage assembly differs between Right Hand Drive (RHD) and Left Hand Drive (LHD) models. The wiper linkage and motor assembly are not available as separate service components.
The windshield wiper motor and linkage assembly is attached to the vehicle body with screws and washers at each end. The screws are located in rubber bushes in the wiper linkage assembly which isolate the assembly from the vehicle body. A rubber locating grommet is located behind the motor and engages on a spigot on the vehicle body to locate the linkage assembly.
The windshield wiper motor comprises a 12V Direct Current (DC) motor and gear wheel and worm drive, contained in an integral housing, and attached to the wiper linkage with three screws.
The windshield wiper motor drives an integral gear wheel through a worm drive attached to the motor spindle. The gear wheel has a central spigot which provides the attachment point for the motor crank. The windshield wiper motor and linkage assembly are one component and cannot be replaced separately.
The motor assembly is connected to the vehicle harness by a four pin electrical connector. The electrical connector provides two battery voltage feeds from the fast/slow wiper relay, located in the left Engine Junction Box (EJB), a ground path for the motor assembly and a wiper park feed for the BCM/GWM assembly.
The wiper motor is prevented from operating when the hood is open. If the vehicle speed is more than 3 km/h (1.9 mph) the BCM/GWM assembly considers the hood closed and the wiper motor will operate.
The motor contains a park switch which is connected to the BCM/GWM assembly. When the motor is switched off, the BCM/GWM assembly detects the park switch opening and stops the windshield wiper motor in the park position.
If the windshield wipers or the linkage become obstructed, the BCM/GWM assembly will remove power to the windshield wiper motor if the park signal does not change state within six seconds. The wiper motor will remain disabled until the obstruction is cleared or an alternative active wiper mode is selected. Three disable events are allowed until a 180 second disable period is activated or until the next ignition cycle when the event counter will be reset to zero.
The windshield wiper motor and linkage assembly comprises a main tube with a pivot housing assembly located at each end. The motor assembly is attached to the tube by four screws. Two link rods are attached to the motor crank to provide the connection between the motor crank and the two pivots.
The motor crank converts rotary motion from the motor output shaft into linear movement of the link rods. The cranks connected to each pivot, convert the linear motion of the link rods back to rotary motion of the pivots. This rotary motion is passed to the wiper arms and blades causing the blades to wipe a reciprocating arc on the windshield.