Pontiac Fiero 1988 Service Manual page 1094

W I P E R / W A S H E R
^ A ^ A ^
CIRCUIT OPERATION
When the Wiper/Washer Switch is in LO or
MIST, Battery voltage is applied to the Wiper
Motor through the GRY wire. In Lo, the Wiper
Motor will continue to run at Low speed until
the Wiper Switch is turned to the OFF position.
When the Wiper Switch is turned to OFF,
voltage is still applied to the Wiper Motor at the
Low speed brushes through the Run/Park
Switch, and ORN and GRY wires. The wipers
complete the last sweep in Low speed. When the
wiper blades reach the PARK position, the
Run/Park Switch opens, shunting the Wiper
Motor causing it to stop immediately. The
wipers remain in the PARK position.
When the Wiper Switch is in HI, Battery
voltage is applied directly to the Wiper Motor
through the PPL wire to the High speed
brushes. The wipers run continuously at High
speed. When turned off, the wipers make the
last sweep in Low speed and park, similar to LO
speed operation.
The Wiper Motor is protected by a Circuit
Breaker. The Circuit Breaker opens if the
wipers are blocked by ice on the windshield, for
example. The Circuit Breaker resets automati-
cally when it cools.
When the Washer Switch is pressed, Battery
voltage is applied to the Washer Pump and the
Wiper Switch is mechanically advanced to the
LO position. The washer sprays the windshield
as long as the switch is held on. The wipers
must be turned off manually after the wash
cycle.