Note. Before starting the test, study the relevant electrical diagrams. Remember that power wires are usually thicker and brighter colored than ground wires. Checking the presence of voltage at the connector terminals is carried out by testing them with a probe of a grounded probe lamp (for 12 V). Turning on the lamp confirms the presence of voltage at the terminal. If during the checks described below it is not possible to identify the cause of the malfunction, the car should be driven to a workshop for a more complete diagnosis of the system.
1. If the windshield wipers are running too slowly, check the battery level first (see chapter Settings and ongoing maintenance). With a good battery, remove the drive motor (see below) and try to move the brushes by hand, checking the freedom of their movement. If necessary, make the appropriate repair of the rods and lubricate the axle units. Install the electric motor in place, turn on the ignition and restart the brushes. If the speed of the wipers after the corrections made has not returned to normal, check the quality of the contact connections of the circuit and the reliability of fixing the connectors, paying special attention to the condition of the ground. If the circuit is good, replace the electric motor.
2. If the wipers fail to activate, check the condition of the corresponding fuse. If the fuse is OK, install a jumper wire between the drive motor ground terminal and chassis ground. Repeat check. If the wipers now start to function normally, restore the reliability of the ground contact nodes. If the motor still does not work, turn on the wipers to the maximum speed, check the power supply to the motor by probing the rear side of the connector with a voltmeter. Note: You will have to remove the fairing panel (see chapter Body). If the power is good, remove the motor and test it by connecting directly to the battery. If the motor works properly when connected to the battery, eliminate the cause of jamming of the wiper drive rods, otherwise replace the electric motor assembly. If the power supply to the motor is interrupted, check for voltage at the wiper control relay. If the relay is energized properly, the correct operation of the switch using an ohmmeter (see Section Check of serviceability of functioning and replacement of understeering switches).
3. If the intermittent wipers are malfunctioning, check the condition of the circuit in the area between the switch and the control module. If the wiring is OK, measure the resistance at the delay control knob of the combination stalk (see Section Check of serviceability of functioning and replacement of understeering switches).
4. If the brushes stop in the position they occupy when the switch is turned to the OFF position, check the motor grounding (harness side connector). Connect an ohmmeter between any of the black wire terminals and a grounded point on the chassis - resistance should be less than 5 ohms.
5. If the brushes stop only after the ignition is turned off, disconnect the wiring from the wiper operation control switch. If the brushes stop now, replace the switch. If the brushes continue to function, therefore, the limit switch of the electric motor is damaged, replace the motor.
6. If the brushes do not go under the plane of the hood when stopped, check the drive rod for foreign objects under it. If nothing prevents the brushes from leaving the park position, check the wiring in the section of the circuit between the switch and the motor. If there are no breaks, replace the motor.
Electric motor replacement
1. Remove levers (leashes) windscreen cleaners.
2. Remove the front fairing panel (see chapter Body).
3. Disconnect the electrical wiring from the motor.
4. Separate motor assembly with drive rod from fairing.
5. Turn out fixing bolts and remove the electric motor.
6. Installation is carried out in the reverse order.