With Pulse
DESCRIPTIONWipe positions include Pulse, low, High, Mist, and Off.
Pulse Mode
With the wiper switch in PULSE, voltage is applied to the wiper/washer motor module and current follows two paths. The first path is through the park relay switch coil to ground. The switch contact closes. The second path is through the control board, closed park relay/switch contacts, and wiper motor to ground. The wiper motor runs. The mechanism signals the control board at the end of each sweep. When a sweep is completed, the control board interrupts power to the wiper motor, and waits for a period of time before allowing current to flow to the wiper motor for another sweep. The pulse delay switch controls the amount of time between sweeps and has five discreet settings. Each setting has a specific resistance value governing the timing voltage supplied to the solid state timing circuit in the motor module.
Low Mode
Operation is similar except that voltage is applied through the park relay/switch contacts, and the wiper motor. The motor runs continuously rather than intermittently.
High Speed Mode
As the wiper/washer switch is moved to HI, voltage is momentarily applied to the park relay/switch coil. Current flows through the park relay/switch coil to ground. The park switch contacts close, and the latch arm moves out of the way of the motor cam. If the wiper/washer switch is left in the HI position, current flows through the high speed winding of the wiper motor to ground. Current also backfeeds through the wiper motor low speed terminal through the closed park switch contacts, the wiper/washer switch, and back through the park switch coil to ground. This holds the park switch contacts closed, and keeps the latch arm clear of the rotating motor cam.
Mist Mode
When the wiper/washer switch is moved to MIST and released, voltage is momentarily applied to the motor. Current flows through the park relay/switch coil to ground. The relay/switch operates and current flows through the closed relay/ switch contacts and the wiper motor to ground. The motor operates for one back-and-forth sweep. During this sweep, an arm, which is mechanically connected to the wiper arms, holds the park relay/switch contacts closed. When the sweep is completed, the arm allows the relay/switch contacts to open, and motor operation stops.
Off Mode
When the wiper/washer switch is moved to OFF, current through the park relay coil is interrupted. Current flows through the park switch contacts and the wiper motor to ground. The motor runs at low speed. The latch arm rides on the edge of the rotating cam, keeping the park switch closed until the notch comes around to park position. The latch arm falls into the notch and opens the park switch contacts. The wipers stop in the park position.
Wash Mode
When the WASH switch is momentarily closed, current flows through the park switch coil to ground. The park switch contacts close, and current flows through the wiper motor to ground. The wiper motor runs at low speed. Current also flows through the control hoard and the park switch coil to ground. This keeps the park/switch contacts closed after the wash switch is released. The control board also allows current to flow through the washer motor for 2-1/2 seconds (if the washer switch is pushed for less than one second), or for as long as the washer switch is held closed (if the washer switch is held closed for more than one second). The control hoard interrupts power to the park switch coil approximately six seconds after it interrupts power to the washer motor. The wipers park.