Wiper Motor Checking

Wiper Motor Checking

NOTE: These instructions apply to Windscreen and Tailgate wiper motors.

If unsatisfactory operation of wiping equipment is experienced, a systematic check to determine the fault should be carried out.

1. Check blades for signs of excessive friction. This reduces wiping speed of motor and cause increased current draw which may damage armature. Check by substitution.
2. Check windscreen wiper motor light running current and speed with the motor coupling link disconnected from wiper shaft transmission linkage.

Check tailgate glass wiper motor with wiper connected and glass wet. Connect an ammeter in series with the motor supply. Measure current consumption when motor is switched on. Check operating speed by timing speed of rotation of motor coupling link. The results should compare with figure given in the General Specifications Data.

NOTE: If vehicle wiring connections are disconnected and an alternative supply source is applied it is essential that correct polarity is observed. Failure to observe this wil cause motor to rotate in reverse direction, which may result in limit switch contacts being damaged.

3. If motor does not run satisfactory or takes higher than normal current, a fault exists and must be remedied.
4. If current consumption and speed of motor are satisfactory. A check should be carried out for proper functioning of transmission linkage and wiper arm shafts.

NOTE: Service parts are not avaliable for windscreen and tailgate wiper motors with the exception of windscreen wiper rotary connecting link.