Beretta L4-121 2.0L (1987)
Wiper Motor: Description and Operation
Compound Wound Motor
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.
