PONTIAC FIERO 1988 Service Repair Manual

(Continued from previous page)
SYMPTOM TABLE
A. WiperIWasher
A: WIPERIWASHER SWITCH
BATTERY VOLTAGE TEST
R SWITCH CONNECTOR
6240 (Connected)
(Continued from previous column)
ClF
(PNK) & 0 Volts See 4
Ground
- -
( Wiper Switch: LO
CIA
(mL) & Battery See 5
Ground
B: WIPER MOTOR MODULE lNPUT
TEST remove the Wiper Motor Module for
repair (See Section
8E for diagnostic pro-
1. Check the DK GRN (95) wire for an
open. Check that the
WiperIWasher
Switch connector 6240 is correctly
mated. If OK, replace the
WiperlWasher
(Continued in next column)
Measure: VOLTAGE
At: WIPER MOTOR IVIODULE CONNECTORS
C1& 62 (Connected)
Conditions:
e Ignition Switch: ACCY
Wiper Switch: OFF or LO
2. Check the GRY (91) wire for an open.
Check that the
WiperIWasher Switch
connector
6240 is correctly mated. If
OK, replace the WiperIWasher Switch.
3. Check the PPL (92) wire for an open.
Check that the
WiperIWasher Switch
connector
6240 is correctly mated. If
OK, replace the Wiper/Washer Switch.
4. Replace the
WiperIWasher Switch.
5. Remove the Wiper Motor for repair (See
For
Diagnosis
See 1
Measure
Between
C1C
(DK GRN)
& Ground
Correct
Voltage
Battery
e Wipes Switch: LO or HI
C1B
(GRY) &
Ground
e Wiper Switch: HI
Battery
See 2

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.

PULSE. CD4

WIPERIWASHER: PULSE, CD4 I G n
TROUBLESHOOTING HINTS
Try the following checks before doing the
System Diagnosis.
1. Check the Wiper Fuse by visual inspection.
2. Check that the three
VViper Motor mounting
bolts are clean and tight.
3. Check that Wipermasher Switch connector
C240 and WiperIWasher Motor Module Con-
nectors are mated correctly.
4. If the Washer does not operate, check that:
- The Washer reservoir is filled.
- The hoses are not pinched or kinked.
- The hoses are correctly attached.
- The nozzles are not clogged.
Go to System Check for a guide to normal
operation.
Go to System diagnosis for diagnostic tests.
SYSTEM CHECK
Use the System Check Table as a guide to
normal operation.
e Refer to System diagnosis for a list of symp-
toms and diagnostic steps.
COMPONENT LOCATION Page-Figure
...... ..................... Fuse Block. Behind LR side of IIP, below light switch.
.................. Washer Motor. LH side of engine compartment, in washer fluid
reservoir
................................
.......................... ............. Wiper Motor Module LN front of dash.
.. C100 (42 cavities) ................ LR front of dash, left of brake master cylinder
.......................... C101(3 cavities) ................. LH front of dash.
....... C240 (7 cavities) ................. Behind IIP, near base of steering column
................... 6112 (VIN E) ................... Rear of LN cylinder head.
................... 6112 (VIN F) (VIN 8) ............. Rear of LN cylinder head.
................... 6112 (VIN S) .................... Rear of LH cylinder head.
S111 ........................... Engine harness, RN rear of engine compartment
............ S117 (VINE) .................... Engine harness, RN front of dash.
...... S117 (VIN F) (VIN 8) ............. Engine harness, top center rear of engine.
SYSTEM CHECK TABLE
Wipers run at low speed and continue to run at
low speed until the Washer Button is released
Pulse function is overridden and the Wipers
run
After the Washer stops, the Wipers continue to
run for six seconds
I Wipers return to Pulse operation
(SYSTEM
CHECK TABLE continued on next page)

WIPERIWASHER: PULSE, CD4 1 g
(SYSTEM CHECK TABLE continued from previous page)
1 4. With the Wiper Switch in HI, hold Washer I Same operation as low speed wash except that I A: WlPERAlVASHER VOLTAGE TEST
I Switch for one or two seconds I the Wipers run at high speed I
1 5. Turn Wiper Switch to LO I wipers run continuously at low speed I
1 8. Move Wiper Switch to MIST I Wipers make one complete stroke and then park I
6. Turn Wiper Switch to HI
7. Turn Wiper Switch to OFF
SYSTEM DIAGNOSIS
Wipers run continuously at high speed
Wipers return to park position at low speed
@ Do the tests listed for your symptom in the
Symptom Table below.
Tests
dollovv the Symptom Table.
SYMPTOM TABLE
SWITCH CONNECTOR
B: WIPER MOTOR VOLTAGE TEST
ODULE CONNECTORS
(Disconnected)
r ignition Switch: AGCY

WIPERNVASHER: PULSE, CD4
Washer Module does not operate nor-
1. Check the GRY (91) wire for an open.
Check that connectors C240 and
C1OO are
properly mated. If the wire and connec-
tors are good, replace the
VViperlWasher
2. Check the PPL (92) wire for an open.
Check that connectors C240 and
ClOO are
6: WIPERIWASHER PULSE CONTROL D: WSHER PUMP VOLTAGE TEST
RESISTANCE TEST
At: WIPER MOTOR MODULE CONNECTOR
GI (Disconnected)
Ignition Switch:
ACCY
Negative Battery Terminal:
DlSCONNECTED
does not operate, remove the Wiper Motor
Module for repair. See Section
8E for diag-
nostic
instmctions.
1. Check the GRU (91) and PNK (94) wires
for opens. If wires are OK, replace the
WiperlWasher Switch.
ODULE CONNECTOR
ignition Switch: AGCV
are good, replace the Washer Motor.
1. Check GRU (91) wire or PNK (94) wire for
an open. If wire is good, replace Wiper1
Washer Switch.
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WIPERIWASHER: PULSE, CB4
(Continued from previous page)
CIRCUIT OPERATION
In addition to the features of a conventional
(Non-pulse) wiper system (MIST, LO and HI
speed), the pulse-type windshield
wiperlwasher
system includes an operating mode in which the
wipers make single strokes with an adjustable
time interval between strokes. The time inter-
val is controlled by a Solid State Pulse Timer
Relay in the WiperIWasher Assembly. The
duration of the delay interval is determined by
the Delay Rheostat
in the WiperIWasher Con-
trol Switch.
Pulse Operation
With the WiperlWasher Switch in Pulse,
battery voltage is applied to the WiperlWasher
Motor Module at terminal
B through the GRY
wire. Voltage is also applied to
terminal F
through the PNK wire and the pulse delay
resistance in the WiperlWasher Switch. The
battery voltage at terminal
B energizes the
Park Relay which closes its contacts. In
response to the voltage at terminal F, the Solid
State Timer momentarily closes contact
A on
the control board which applies the battery
voltage at terminal
B to the contacts of the
Park Relay, starting the Wiper Motor.
A second mechanical arm (end of sweep
input) operates contacts on the Control Board
which cause the contacts at A to open when the
wipers have completed their sweep. Since the Park
Relay remains energized, the wipers do
not park but remain just above the parked posi-
tion until the Control Board closes the contacts
at A again to start
another sweep.
The length of delay time between sweeps is
controlled by the variable Pulse Delay resistor.
The delay is adjustable from zero to
25 seconds.
Low Speed
In the LO position of the WiperIWasher
Switch, battery voltage is applied at terminal C
of the Wiper Motor Module as well as terminal
B, through the DK GRN and GRY wires. The
Park Relay is again energized and battery
voltage is applied to the Park Relay contacts
from terminal
G and the Wiper Motor which
runs continuously.
High Speed
With the Wiper Switch in the HI position,
battery voltage is supplied directly to the
Wiper Motor, without passing through the
Park Relay contacts. The input (PPL wire) is
connected to a separate armature brush for
high speed operation.
When turned off from HI, the wipers com-
plete the last sweep at low speed and park. To
do this, the Wiper Motor receives battery volt-
age
in the OFF position of the Wiper Switch
which is applied through the
DM GRN wire to
terminal C of
61. The Park relay is deenergized
when the WiperlWasher Switch
is moved to
OFF, but the contacts remain closed until the
wipers reach the parked position. The
Wiper Motor is protected by a Circuit
Breaker. If the wipers are obstructed, by snow
or ice for example, the circuit breaker
will open
the circuit. The Circuit Breaker resets automat-
ically when
it cools.
Washer
When the Washer Switch is held ON, battery
voltage is applied to the Control Board through
the PNK and GRY wires. The Park Relay is
energized by the battery voltage at ter
The Control Board turns on the Washer and
Wiper Motors by closing contacts A and
B. The
Control Board turns the Wiper Motor OFF
approximately
6 seconds after it interrupts
power to the Washer Motor. If the Wipers had
been in Pulse, LO, or HI, they would return to
that operation after the wash cycle.
Mist
When the control is moved to MIST and
released, the wipers make one sweep at low
speed and return to park. The circuit operation
is the same as that of LO.

HEADLIGHTS

TROUBLESHOOTING HINTS COMPONENT LOCATION Page-Figure
* Try the following checks before doing the Headlight Dimmer Switch. ........ Behind IIP, on LH upper side of steering column. 201- 9-A
System Diagnosis. el00 (42 cavities) ................ LH front of dash, left of brake master cylinder .. 201- 0-A
.... ............. 1. If Headlights on one side are on dimly, 6103 (Except VIN E)
On radiator support, behind LH headlights. 201-16-A
........... ................... check the ground on that side. 6103 (VIN E) RN inner fender panel, near battery 201- 3-B
2. If Hi Beams do not light, but the Hi Beam
Indicator lights, check LT
GRN (11) wire
for an open (see schematic).
3. If one Headlight doesn't work, check the
Headlight, connections, and wires to the
Headlight.
4. If the Headlights do not turn off, replace
the Light Switch.
Go to System Diagnosis for diagnostic tests.
SYSTEM DIAGNOSIS
Diagnostic steps for the symptoms listed in
the following table are listed after the table.
SYMPTOM TABLE
A: All Headlights are inoperative or
intermittent
B: Lo Beams on both sides are inoperative
s and Hi Beam Indicator are
.... .......................... 6104 On radiator support, behind RH headlights. 201-16-A
............ 6200 .......................... Behind IIP, left of steering column 201-10-A
.... .......................... S107. Front lights harness, behind LH headlights. 201-16-A
.... .......................... S110. Front lights harness, behind RH headlights 201-16-A
.... .......................... S149. Front lights harness, behind LH headlights. 201-16-A
.... S150. .......................... Front lights harness, behind LH headlights. 201-16-A
........ S205. .......................... IIP harness, behind instrument cluster. 201-10-A
A: ALL HEADLIGHTS ARE
INOPERATIVE OR INTERMITTENT
(TABLE 1)
A: ALL HEADLIGHTS ARE
INOPERATIVE OR INTERMITTENT
(TABLE 21
Connect: TEST LAMP
At: LIGHT
SVVITCH CONNECTOR C1
(Connected)
Condition:
r Liaht Switch: HEAD
Connect Correct
Between Result Diagnosis
C (RED) Test Lamp
& Ground lights See 1
D
(YEL) Test Lamp
If both results are correct, go to Test B.
1 1. Check Fusible Link A and RED (2) wire
for an open (see Power Distribution).
Connect: FUSED JUMPER
At: LIGHT
SWITCH CONNECTOR C1
(Disconnected)
Conditions:
r Put a 15 amp fuse in the fused jumper
* Headliaiht Dimmer Switch: LO
I Connect 1 Correct ( or 1
Between I Indication 1 Diagnosis I I
I C (RED) & ( Heydlights I See D (YEL) ight
I Headlight Dimmer Switch: HI I
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