Headlamp Wipers

Current is supplied via fuse 7 to each wiper motor 66 and also via fuse 8 to switch 61 for operation of the headlamp wipers.

When the stalk switch is moved towards the steering wheel rim (position P), headlamp wiper motors 66 and washer motor 63 start simultaneously.

When the stalk is released, breaking the circuit, the wiper motors are still supplied with current via fuse 7. When the wiper motors have completed a cycle of five strokes, their integral limit switch breaks the circuit and the wipers stop in the parked position.

A diode in each motor prevents current from the motor feedback circuit from flowing back to the washer motor.

Each wiper motor is internally protected against overloads by means of a circuit breaker actuated by a PTC resistor. The circuit breaker is connected in series with the motor and trips if the load becomes excessive, as might happen if the wiper blades are frozen to the headlamp lenses, for instance.