Permanent Magnet Motor
Fig. 10 Permanent magnet non-depressed park type windshield wiper motor. Exc. Citation, Omega, Phoenix & 1982---85 Skylark (Note: The harness connector may be labeled D-C-B-A instead of 1-2-3-4):
NON-DEPRESSED PARK EXC. CITATION, OMEGA, PHOENIX & 1982---85 SKYLARK
Wiper motor internal components, including permanent magnet fields, armature, brush holder and gear train, are enclosed in a die cast aluminum housing with a plastic cover, Fig. 10. The brush holder contains a circuit breaker and park switch as well as common, low and high speed brushes, and it is located at the gear box end of the motor.
The common brush is connected to ground through the wiper motor ground strap. Battery voltage is supplied to the wiper switch and motor park switch fixed contacts through a fuse in the fuse block. Motor speeds are determined by supplying voltage through the wiper switch to the low or high speed motor brush, and when wiper switch is in off position, voltage supplied to the motor park switch allows wipers to park at the bottom of their travel. Pulse wiper operation, if equipped, is controlled by a variable resistor in the wiper switch and by a pulse module connected between the wiper motor and switch.
Standard (Non-Pulse) Wiper Operation
When ignition is on, battery voltage is supplied to low and high speed contacts in the wiper switch and to motor terminal 4, Fig. 10. Placing wiper switch in low or high position completes the feed circuit to motor terminal 2 (low speed brush) or terminal 1 (high speed brush), Fig. 10. Current flows through the armature to ground through the common brush, and the motor runs at the selected speed.
Placing wiper switch in off position connects the motor low speed brush to park switch terminal 3, Fig. 10. Current flows through the closed park switch contacts, allowing the motor to run at low speed. When wipers reach their lowest point of travel, a cam on the motor output shaft opens the park switch through an actuating lever, and the motor stops.
Pulse Wiper Operation
In addition to standard wiper system components, models with pulse wipers use a pulse control module and a wiper switch with a variable resistor and additional contacts to control pulse module operation. Current flow between the wiper motor and switch, and battery voltage to the switch pass through the pulse control module. However, when the wiper switch is in off, low or high position, the module does not affect system operation.
When the wiper switch is in delay position, voltage is supplied to the pulse module timer through the variable resistor. When the timer circuit becomes fully charged, the timer switch closes, and voltage is supplied to the motor through a second delay terminal in the wiper switch. As the motor begins to operate, the park switch closes, the timer switch opens, and voltage is supplied to the motor through a third delay contact which is linked to the park switch in the wiper switch. When wipers complete their cycle, the park switch opens, the motor stops, and the timer begins to recharge.
This cycle repeats as long as wiper switch is in delay position. Delay period is controlled by varying resistance in the pulse module timer feed circuit.
Fig. 11 Permanent magnet depressed park type windshield wiper motor w/integral washer pump:
Fig. 12 Permanent magnet depressed park type windshield wiper motor w/remote washer pump:
DEPRESSED PARK MOTOR
Wiper motor assembly consists of a permanent magnet wiper motor with either an integral flex-vane washer pump mounted in the cover, or with a washer pump remotely mounted in the washer tank, Figs. 11 and 12. Depending upon the type control switch used and whether an optional control board is included in the motor cover, the system can serve as either a standard or pulse type wiper. The timing functions along with the program and demand wash functions are controlled by a printed circuit board permanently attached to the wiper cover.
Standard (Non-Pulse) Wiper Operation
Moving the multi-function lever to low or high speed position completes the respective brush circuit to 12 volt terminal at the multi-function lever and motor runs at that speed.
An instantaneous wipe can be obtained by moving the multi-function lever to mist position. A continuous wipe will be performed if the button is held.Pulse Wiper Operation
The multi-function lever in the DELAY mode can be turned from a minimum to a maximum position. Turning the control knob from minimum to maximum position varies the amount of time wiper will delay between each wipe. Delay ranges between 0---12 seconds depending on knob position. Minimum delay or 0 seconds between wipes provides equivalent of low speed continuous operation.
Moving the multi-function lever to low or high speed position completes the respective brush circuit to 12 volt terminal at the multi-function lever and motor runs at that speed.
Moving the multi-function lever to pulse mode operates the motor intermittently and delay can be varied by moving switch back and forth in the delay mode.
An instantaneous wipe can be obtained by moving the multi-function lever to mist position. A continuous wipe will be performed if the button is held.