WIPERS AND WASHERS (Description): DESCRIPTION AND OPERATION (page 4 of 9)

WIPERS AND WASHERS

DESCRIPTION AND OPERATION

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Front wiper motor assembly

The front wiper motor assembly is located on the bulkhead beneath the plenum.

The dc motor contains two permanent magnets, three brushes and a park switch. The smaller third brush is utilised 
for high-speed operation. Attached to the brush pack are 3 capacitors, which minimise radio interference during wiper 
operation. A thermal trip switch attached to the brush plate prevents thermal overload of the motor.

The motor incorporates a worm drive gear unit to transfer the rotary motion into a linear motion of the wiper linkage 
assembly.

The front wiper motor receives battery voltage from fuse 19 of the passenger compartment fuse box.  For low-speed 
operation, including intermittent variable delay operation, the battery voltage to move the wiper motor from the park 
position passes through the front wiper relay.  When the park switch moves to the closed when operating position, 
fuse 19 of the passenger compartment fuse box provides battery voltage directly to the wiper motor.

For high-speed operation, including flick wipe, fuse 19 in the passenger compartment fuse box provides the battery 
voltage to move the wiper motor from the park position through the front wash/ wipe switch to the front wiper motor.  
To achieve high-speed wiper operation, power is supplied to a third brush that provides a closer distance between the 
motor poles.  Because the poles of the motor are closer together, the motor operates faster.