Wiper and Washer Systems: Description and Operation

A compound wound type wiper motor is used on 1982---83 Celebrity, Century, Cutlass Ciera and 6000, 1982---85 Eldorado, Riviera, Seville and Toronado, and all rear wheel drive models except FIERO, 1984---87 Camaro and Firebird, and 1987 Cutlass, Grand Prix and Monte Carlo. Motor speeds on this type motor are determined by varying current flow through the motor shunt field. Two different compound wound motors are used, depending upon application. A rectangular positive park motor motor is used on Chevette and 1000, and a round motor is used on models with depressed park wipers.
A permanent magnet type motor is used on FIERO, 1984---87 Camaro and Firebird, 1987 Cutlass, Grand Prix and Monte Carlo, and front wheel drive models except 1982---83 Celebrity, Century, Cutlass Ciera and 6000, and 1982---85 Eldorado, Riviera, Seville and Toronado. Permanent magnet motors have three brushes, common, low and high speed. Motor speeds are determined by completing the circuit to the low or high speed brush, while the common brush is used at both speeds.

Windshield wiper operation is controlled by a dash or steering column mounted switch. The wiper feed circuit is protected by a fuse which is located in the fuse block on most models, or in an inline fuse holder on some models with pulse wipers. A circuit breaker, integral with the motor brush holder, protects the motor against overload. Pulse wipers, available on most models, use a variable resistor, a pulse control module, and/or a modified wiper motor to provide a delay wipe mode.