Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
On models with pulse wipers, a pulse control module provides a delay wipe mode through the low speed circuit. When wiper control is in delay
position, battery voltage is supplied to a capacitor in the module through a variable resistor. When the capacitor is fully charged, it activates a switching
circuit which provides a ground to begin wiper operation. As the motor operates, park switch contacts close, the capacitor discharges, and the motor
ground is maintained through the park switch. When wipers complete their cycle, the park switch opens and the capacitor begins to recharge. Delay
between wipe cycles is determined by a variable resistor, which controls charging current to the capacitor. Higher resistance produces a longer delay.
Fig. 3 Compound Wound Round Windshield Wiper Motor
Fig. 4 Compound Wound Round Windshield Wiper Motor W/modified Pulse System
