wiper blades PONTIAC FIERO 1988 Service Repair Manual

C: WASHER MOTOR MODULE
VOLTAGE TEST (TABLE
1 ) -
Measure: VOLTAGE
At: WIPER MOTOR MODULE CONNECTOR
Cl (Connected)
Conditions:
Ignition Switch: ACCY
Washer Switch: ON
Measure Correct For Diagnosis
Between Voltage
I (PNK'& I Battery I See 1 I Ground
If voltage is correct, go to Table 2.
1. Check PNK (94) wire for an open. Check
that WiperlWasher Switch connector
6240 is correctly mated. If wire and con-
nector are good, replace the Wiper1
Washer Switch.
CfWASHER MOTOR MODULE
VOLTAGE TEST (TABLE
2)
Measure: VOLTAGE
At:
VVASHER MOTOR CONNECTOR
(Disconnected)
Conditions:
Ignition Switch: ACCY
0 Washer Switch: ON
Measure
Between
I ::::ii 1 For Diagnosis I
I A(RED'& I Battery I See 1 I Ground
A (RED' & Battery
(DK BLU) See 2
If both voltages are correct, but Washer
Motor does not run, replace Washer
Motor.
(Continued in next column) (Continued
from previous column)
of Wiper Motor Module. (between
terrni-
nals F and D).
CIRCUIT OPERATION
LO SPEED
When the WiperlWasher Switch is in the LO
position, battery voltage is applied to the Park
Relay through the GRY wire. This closes the
relay contacts and supplies battery voltage to
the Wiper Motor through the DK GRN and
YEL wires. The wiper blades run continuously.
When the WiperIWasher Switch is turned to
the OFF position, the Park Relay is
deen-
ergized. However, a mechanical arm riding on a
cam attached to the Wiper Motor keeps the
relay contacts closed until the wipers park or
complete the last sweep. After this last sweep
the mechanical arm falls into a detent
perrnit-
ting the relay contacts to open. This stops the
Wiper Motor, and the Wiper blades remain in
park.
HI SPEED
When the WiperIWasher Switch is in the Hi
position, the Park Relay is again energized to
relase the latch arm. However, battery voltage
is applied to the high speed brushes of the
Wiper Motor through the PPL wire. The wipers
run continuously at a higher speed. When the
WiperlWasher Switch is turned OFF, the wiper
blades
will move at low speed for the final sweep
and then park.
VVASHER OPERATION
When the Washer Switch is pressed ON, bat-
tery voltage is applied to the Washer Motor
as
well as mechanically advancing the Wiper
Switch to LO. The Washer sprays the wind-
shield as long as its switch is held ON. The
wipers must be turned off manually after the
wash cycle.
The Wiper Motor is protected by a Circuit
Breaker. The Circuit Breaker
will open if the
wiper blades are blocked, by ice on the wind-
shield, for example. The Circuit Breaker resets
automatically when it cools.

BE -10 WINDSHIELD WIPER SYSTEMS - F CARLINE
I PROCEDURE 9 1
I I HARNESS I CONNECTOR
(Q)
CIRCUIT FROM WIPER SWITCH
TO MOTOR. REFER TO
WlPERlWASHER CHECK CONTINUITY
BETWEEN HARNESS
HARNESS
CONNECTOR
I
REFER TO WlPERlWASHER
SWITCH CHECK CHART. I
HARNESS
CONNECTORS
654321 9 8 7
GROUND, AND EEN TERMINALS #l & #8 IN WIRING
BLADES
CYCLE IN AND OUT OF
DOES MOTOR OPERATE ON "LO"?
Fig. 11 Diagnostic Procedures 9 & 10