air DODGE NEON 2000 Service Owners Manual

VEHICLE SPEED CONTROL SYSTEM
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
SPEED CONTROL SYSTEM.................1
SPEED CONTROL SERVO-PCM OUTPUT.......2
SPEED CONTROL SWITCHESÐPCM INPUT....2
STOP LAMP SWITCH......................3
SERVO CABLE...........................3
VACUUM RESERVOIR.....................3VEHICLE SPEED SENSOR..................3
REMOVAL AND INSTALLATION
SPEED CONTROL SERVO...................3
SPEED CONTROL SWITCH..................4
SPEED CONTROL SERVO CABLE.............4
VACUUM RESERVOIR.....................5
DESCRIPTION AND OPERATION
SPEED CONTROL SYSTEM
OPERATION
The speed control system is electronically con-
trolled and vacuum operated. The electronic control
is integrated into the Powertrain Control Module
which is located in the engine compartment. The con-
trols are located on the steering wheel and consist of
five switches. The ON, OFF and SET buttons are
located on the left side of the airbag module. The
RESUME, ACCEL, COAST and CANCEL buttons
are located on the right side of the airbag module
(Fig. 1).
The system is designed to operate at speeds above
25 mph (40 km/h).
WARNING: THE USE OF SPEED CONTROL IS NOT
RECOMMENDED WHEN DRIVING CONDITIONS DO
NOT PERMIT MAINTAINING A CONSTANT SPEED,
SUCH AS IN HEAVY TRAFFIC OR ON ROADS THAT
ARE WINDING, ICY, SNOW COVERED, OR SLIP-
PERY.
The speed control can be disengaged manually by:
²Stepping on the brake pedal
²Depressing the OFF switch
²Depressing the CANCEL switch.
The speed control can be disengaged also by any of
the following conditions:
²An indication of Park or Neutral
²The VSS signal increases at a rate of 10 mph
per second (indicates that the co-efficient of friction
between the road surface and tires is extremely low)
²Depressing the clutch pedal.
²Excessive engine rpm (indicates that the trans-
mission may be in a low gear)²The VSS signal decreases at a rate of 10 mph
per second (indicates that the vehicle may have
decelerated at an extremely high rate)
²If the actual speed is not within 20 mph of the
set speed
The previous disengagement conditions are pro-
grammed for added safety.
Fig. 1 Speed Control Switch
1 ± SPEED CONTROL SWITCHES
2 ± RES ACCEL
3 ± CANCEL
4 ± COAST
5 ± SET
6 ± ON/OFF
PLVEHICLE SPEED CONTROL SYSTEM 8H - 1

SPEED CONTROL SERVO-PCM OUTPUT
DESCRIPTION
The servo unit consists of a solenoid valve body,
and a vacuum chamber. The solenoid valve body con-
tains three solenoids:
²Vacuum
²Vent
²Dump
The vacuum chamber contains a diaphragm with a
cable attached to control the throttle linkage.
OPERATION
The PCM controls the solenoid valve body. The
solenoid valve body controls the application and
release of vacuum to the diaphragm of the vacuum
servo. The servo unit cannot be repaired and is ser-
viced only as a complete assembly.
Power is supplied to the servo's by the PCM
through the brake switch. The PCM controls the
ground path for the vacuum and vent solenoids.
The dump solenoid is energized anytime it receives
power. If power to the dump solenoid is interrupted,
the solenoid dumps vacuum in the servo. This pro-
vides a safety backup to the vent and vacuum sole-
noids.
The vacuum and vent solenoids must be grounded
at the PCM to operate. When the PCM grounds the
vacuum servo solenoid, the solenoid allows vacuum
to enter the servo and pull open the throttle plate
using the cable. When the PCM breaks the ground,
the solenoid closes and no more vacuum is allowed to
enter the servo. The PCM also operates the vent sole-
noid via ground. The vent solenoid opens and closes a
passage to bleed or hold vacuum in the servo as
required.
The PCM duty cycles the vacuum and vent sole-
noids to maintain the set speed, or to accelerate and
decelerate the vehicle. To increase throttle opening,
the PCM grounds the vacuum and vent solenoids. To
decrease throttle opening, the PCM removes the
grounds from the vacuum and vent solenoids. When
the brake is released, if vehicle speed exceeds 25
mph to resume, 30 mph to set, and the RES/ACCEL
switch has been depressed, ground for the vent and
vacuum circuits is restored.
SPEED CONTROL SWITCHESÐPCM INPUT
Description
There are two separate switch pods that operate
the speed control system. The steering-wheel-
mounted switches use multiplexed circuits to provide
inputs to the PCM for ON, OFF, RESUME, ACCEL-
ERATE, SET, DECEL and CANCEL modes. Refer tothe owner's manual for more information on speed
control switch functions and setting procedures.
The individual switches cannot be repaired. If one
switch fails, the entire switch module must be
replaced.
Operation
When speed control is selected by depressing the
ON, OFF switch, the PCM allows a set speed to be
stored in RAM for speed control. To store a set speed,
depress the SET switch while the vehicle is moving
at a speed between 25 and 85 mph. In order for the
speed control to engage, the brakes cannot be
applied, nor can the gear selector be indicating the
transmission is in Park or Neutral.
Once the speed control has been disengaged,
depressing the ACCEL switch restores the vehicle to
the target speed that was stored in the PCM's RAM.
NOTE: Depressing the OFF switch will erase the
set speed stored in the PCM's RAM.
If, while the speed control is engaged, the driver
wishes to increase vehicle speed, the PCM is pro-
grammed for an acceleration feature. With the
ACCEL switch held closed, the vehicle accelerates
slowly to the desired speed. The new target speed is
stored in the RAM when the ACCEL switch is
released. The PCM also has a ªtap-upº feature in
which vehicle speed increases at a rate of approxi-
mately 2 mph for each momentary switch activation
of the ACCEL switch.
The PCM also provides a means to decelerate with-
out disengaging speed control. To decelerate from an
existing recorded target speed, depress and hold the
COAST switch until the desired speed is reached.
Then release the switch. The ON, OFF switch oper-
ates two components: the PCM's ON, OFF input, and
the battery voltage to the brake switch, which powers
the speed control servo.
Multiplexing
The PCM sends out 5 volts through a fixed resistor
and monitors the voltage change between the fixed
resistor and the switches. If none of the switches are
depressed, the PCM will measure 5 volts at the sen-
sor point (open circuit). If a switch with no resistor is
closed, the PCM will measure 0 volts (grounded cir-
cuit). Now, if a resistor is added to a switch, then the
PCM will measure some voltage proportional to the
size of the resistor. By adding a different resistor to
each switch, the PCM will see a different voltage
depending on which switch is pushed.
8H - 2 VEHICLE SPEED CONTROL SYSTEMPL
DESCRIPTION AND OPERATION (Continued)

On most vehicles another resistor has been added
to the at rest circuit causing the PCM to never see 5
volts. This was done for diagnostic purposes. If the
switch circuit should open (bad connection) then the
PCM will see the 5 volts and know the circuit is bad.
The PCM will then set an open circuit fault.
STOP LAMP SWITCH
DESCRIPTION
The switch is mounted on the brake pedal mount-
ing bracket under the instrument panel.
OPERATION
Vehicles equipped with the speed control option use
a dual function stop lamp switch. The PCM monitors
the state of the dual function stop lamp switch. Refer
to the Brake section for more information on stop
lamp switch service and adjustment procedures.
The brake switch is equipped with three sets of
contacts, one normally open and the other two nor-
mally closed (brakes disengaged). The PCM sends a
12 volt signal to one of the normally closed contacts
in the brake switch, which is connected to a ground.
With the contacts closed, the 12 volt signal is pulled
to ground causing the signal to go low. The low volt-
age signal, monitored by the PCM, indicates that the
brakes are not applied. When the brakes are applied,
the contacts open, causing the PCM's output voltage
to go high, disengaging the speed control also
grounding the dump solenoid.
The second set of normally closed contacts is sup-
plied battery voltage any time speed control is
selected. From the brake switch, current is routed to
the speed control servo solenoids. The speed control
solenoids (vacuum, vent and dump) are provided this
current any time the speed control is ON and the
brakes are disengaged. When the driver applies the
brakes, the contacts open and current is interrupted
to the solenoids. The normally open contacts are fed
battery voltage. When the brakes are applied, battery
voltage is supplied to the stop lamps.
SERVO CABLE
DESCRIPTION
The speed control servo cable is connected between
the speed control vacuum servo diaphragm and the
throttle body control linkage.
OPERATION
This cable causes the throttle control linkage to
open or close the throttle valve in response to move-
ment of the vacuum servo diaphragm.
VACUUM RESERVOIR
OPERATION
The reservoir stores engine vacuum in the reser-
voir. When engine vacuum drops, as in climbing a
grade while driving, the reservoir supplies the vac-
uum needed to maintain proper speed control opera-
tion. The vacuum reservoir cannot be repaired and
must be replaced if faulty.
VEHICLE SPEED SENSOR
The Vehicle Speed Sensor (VSS) is a pulse genera-
tor mounted to an adapter near the transmission out-
put shaft. The sensor is driven through the adapter
by a speedometer pinion gear. The VSS pulse signal
to the speedometer/odometer is monitored by the
PCM speed control circuitry to determine vehicle
speed and to maintain speed control set speed.
REMOVAL AND INSTALLATION
SPEED CONTROL SERVO
REMOVAL
(1) Disconnect electrical connector from servo (Fig.
2).
(2) Disconnect vacuum hose from servo
(3) Remove 2 nuts retaining cable to servo.
(4) Remove retaining clip pin holding cable to
servo.
Fig. 2 Speed Control Servo
PLVEHICLE SPEED CONTROL SYSTEM 8H - 3
DESCRIPTION AND OPERATION (Continued)

INSTALLATION
(1) Install retaining clip to cable at servo.
(2) Install 2 nuts at cable to servo and servo
bracket, tighten to 7 N´m (60 ins. lbs.).
(3) Connect electrical connector to servo.
(4) Connect vacuum hose to servo
SPEED CONTROL SWITCH
The speed control switches are mounted in the
steering wheel and wired through the clock spring
device under the airbag module (Fig. 1).
WARNING: IF REMOVAL OF AIRBAG MODULE IS
NECESSARY, REFER TO THE RESTRAINT SYS-
TEMS.
REMOVAL
(1) Turn off ignition.
(2) Remove two screws from side of each switch.
(3) Rock switch away from airbag and steering
wheel.
(4) Disconnect two-way electrical connector.
(5) Repeat for the other switch.
INSTALLATION
(1) Install switches.
(2) Connect two-way electrical connector.
(3) Install two screws to the side of each switch.
(4) Install airbag, refer to the Restraint Systems
SPEED CONTROL SERVO CABLE
REMOVAL
(1) Disconnect the negative battery cable.
(2) Remove the throttle cable cover.
(3) Remove speed control cable from throttle lever
by sliding clasp out of the hole (Fig. 4).
(4) Lift the retaining tab on the throttle cable and
slide cable out of bracket. Lift the retaining tab on
the speed control cable and slide cable out of bracket.
(5) Disconnect electrical connector from servo.
(6) Disconnect vacuum hose from servo
(7) Remove 2 nuts retaining bracket to servo (Fig.
3).
(8) Remove push nuts holding cable housing to
servo.
(9) Remove retaining clip holding cable to servo.
INSTALLATION
(1) Install retaining clip to cable at servo.
(2) Slide cable bell housing over servo mounting
studs.
(3) Install servo mounting studs into bracket.
(4) Install 2 nuts at cable to servo and servo
bracket, tighten to 7 N´m (60 ins. lbs.).
(5) Connect electrical connector to servo.
(6) Connect vacuum hose to servo
(7) Rotate the throttle lever forward to the wide
open position and install speed control cable clasp.
(8) Slide speed control cable into throttle cable
bracket and engage retaining tab. Slide throttle cable
into throttle cable bracket and engage retaining tab.
(9) Install the Throttle cable cover.
(10) Connect the negative battery cable.
Fig. 3 Speed Control Servo
Fig. 4 Speed Control Cable
8H - 4 VEHICLE SPEED CONTROL SYSTEMPL
REMOVAL AND INSTALLATION (Continued)

TURN SIGNAL and HAZARD WARNING SYSTEMS
TABLE OF CONTENTS
page page
GENERAL INFORMATION
INTRODUCTION..........................1
DESCRIPTION AND OPERATION
HAZARD WARNING SYSTEM................2
HEADLAMP SWITCH......................2
COMBINATION FLASHER...................2DIAGNOSIS AND TESTING
MULTI-FUNCTION SWITCH.................3
REMOVAL AND INSTALLATION
COMBINATION FLASHER...................5
MULTI-FUNCTION SWITCH.................5
GENERAL INFORMATION
INTRODUCTION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, PASSIVE RESTRAINT SYS-
TEMS FOR AIRBAG REMOVAL.
The turn signals are part of the multi-function
switch (Fig. 1), which contains:
²Electrical circuitry for turn signals
²Hazard warning switch²Headlamp switch
²Fog Lamp Switch
²Headlamp beam select switch
²Optical Horn
²Instrument Panel Lamp Dimmer/Interior Lamp
Switch
²Combination Flasher
Fig. 1 Mutli-Function Switch
1 ± TURN SIGNAL CONTROL STALK
2 ± HAZARD WARNING SWITCH
3 ± WINDSHIELD WIPER/WASHER CONTROL
4 ± WINDSHIELD WIPER/WASHER SWITCH RETAINING
SCREWS5 ± CANCELLING CAM
6 ± PANEL DIMMER/INTERIOR LIGHT SWITCH
7 ± EXTERIOR LIGHTING CONTROL/FOG LAMP
PLTURN SIGNAL and HAZARD WARNING SYSTEMS 8J - 1

DIAGNOSIS AND TESTING
MULTI-FUNCTION SWITCH
Should any function of the multi-function switch
fail, the entire switch assembly must be replaced.
Refer to Turn Signal and Hazard Warning Flasher
Diagnosis table.
TURN SIGNAL AND HAZARD WARNING FLASHER DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
TURN SIGNAL FLASHES AT
TWICE THE NORMAL RATE.(1) FAULTY EXTERNAL LAMP.
(2) POOR GROUND AT LAMP.
(3) OPEN CIRCUIT IN WIRING TO
EXTERNAL LAMP.
(4) FAULTY CONTACT IN SWITCH.(1) REPLACE LAMP.
(2) CHECK AND/OR REPAIR WIRING
(3) REPAIR WIRING HARNESS.
CHECK CONNECTORS.
(4) REPLACE MULTI FUNCTION
SWITCH.
INDICATOR LAMP ILLUMINATED
BRIGHTLY, EXTERNAL LAMP
GLOWS DIMLY AT A RAPID
RATE.(1) LOOSE OR CORRODED
EXTERNAL LAMP CONNECTION.
(2) POOR GROUND CIRCUIT AT
EXTERNAL LAMP.
(3) OPEN INSTRUMENT CLUSTER.(1) REPLACE SOCKET CONNECTION.
(2) REPAIR WIRING HARNESS.
CHECK CONNECTORS.
(3) REPLACE INSTRUMENT
CLUSTER.
HAZARD WARNING SYSTEM
DOES NOT FLASH.(1) FAULTY FUSE.
(2) FAULTY FLASHER.
(3) OPEN CIRCUIT IN FEED WIRE TO
SWITCH.
(4) FAULTY CONTACT IN SWITCH.
(5) OPEN OR GROUNDED CIRCUIT
IN WIRING TO EXTERNAL LAMPS.(1) REPLACE FUSE.
(2) REPLACE FLASHER.
(3) REPAIR WIRING HARNESS,
CHECK CONNECTORS.
(4) REPLACE MULTI FUNCTION
SWITCH.
(5) REPAIR WIRING HARNESS.
INDICATOR LAMP ILLUMINATES
BRIGHTLY, EXTERNAL LAMP
DOES NOT LIGHT.(1) OPEN CIRCUIT IN WIRE TO
EXTERNAL LAMP.
(2) BURNED OUT LAMP.(1) REPAIR WIRING HARNESS.
(2) REPLACE LAMP.
SYSTEM DOES NOT FLASH ON
EITHER SIDE.(1) FAULTY FUSE.
(2) FAULTY FLASHER UNIT.
(3) LOOSE BULKHEAD CONNECTOR.
(4) LOOSE OR FAULTY REAR
WIRING HARNESS OR TERMINALS.
(5) OPEN CIRCUIT TO FLASHER
UNIT.
(6) OPEN CIRCUIT IN FEED WIRE TO
TURN SIGNAL SWITCH.
(7) FAULTY SWITCH CONNECTION IN
SWITCH.
(8) OPEN OR GROUNDED CIRCUIT
IN WIRING TO EXTERNAL LAMPS.(1) REPLACE FUSE.
(2) REPLACE FLASHER.
(3) TIGHTEN CONNECTOR.
(4) REPAIR WIRING HARNESS
(5) CHECK CONNECTORS, REPAIR
WIRING HARNESS.
(6) CHECK CONNECTORS, REPAIR
WIRING HARNESS.
(7) REPLACE MULTI FUNCTION
SWITCH.
(8) REPAIR WIRING HARNESS.
SYSTEM DOES NOT CANCEL
AFTER COMPLETION OF THE
TURN.(1) BROKEN CANCELLING FINGER
ON SWITCH.
(2) BROKEN OR MISSING
CANCELLING CAM ON
CLOCKSPRING.(1) REPLACE MULTI FUNCTION
SWITCH.
(2) REPLACE CLOCKSPRING.
EXTERNAL LAMPS OPERATE
PROPERLY, NO INDICATOR
LAMP OPERATION.(1) FAULTY INDICATOR LAMP IN
INSTRUMENT CLUSTER.
(2) OPEN CIRCUIT OR WIRING.(1) REPLACE LAMP.
(2) REPAIR WIRING HARNESS.
PLTURN SIGNAL and HAZARD WARNING SYSTEMS 8J - 3

WINDSHIELD WIPER and WASHER SYSTEMS
TABLE OF CONTENTS
page page
WINDSHIELD WIPER SYSTEM................ 1WINDSHIELD WASHER SYSTEM.............. 8
WINDSHIELD WIPER SYSTEM
TABLE OF CONTENTS
page page
GENERAL INFORMATION
INTRODUCTION..........................1
DESCRIPTION AND OPERATION
WIPER BLADES...........................1
DIAGNOSIS AND TESTING
WINDSHIELD WIPER CONDITIONS............2
WINDSHIELD WIPER MOTOR................3
WINDSHIELD WIPER/WASHER SWITCH........5
REMOVAL AND INSTALLATION
WINDSHIELD WIPER ARM(S)................5WINDSHIELD WIPER BLADE(S)..............5
WINDSHIELD WIPER BLADE ELEMENT........5
WINDSHIELD WIPER LINKAGE...............5
WINDSHIELD WIPER MODULE...............6
WINDSHIELD WIPER MOTOR................6
WINDSHIELD WIPER/WASHER SWITCH........6
CLEANING AND INSPECTION
WINDSHIELD WIPER BLADE(S)..............6
ADJUSTMENTS
WINDSHIELD WIPER ARM(S)................6
GENERAL INFORMATION
INTRODUCTION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M, PASSIVE
RESTRAINT SYSTEMS FOR STEERING WHEEL
REMOVAL AND INSTALLATION.
The windshield wipers will only operate with the
ignition switch in the ACCESSORY or IGNITION
RUN position. The wiper circuit is protected against
over loads by a fuse in the fuse block and a circuit
breaker within the wiper motor. This protects the cir-
cuitry of the wiper system and the vehicle. The wiper
motor has permanent magnet fields.
The intermittent wiper system, in addition to low
and high speed, has a delay mode and a pulse wipe
mode. The delay mode has a range of 1 to 15 seconds.
Pulse wipe is accomplished by momentarily moving
the stalk lever into the WASH position while the
wiper switch is in either OFF or DELAY position.
The wiper blades then sweep once or twice and
return to the previous wiper switch mode, OFF or
DELAY.The intermittent wiper function is integral to the
wiper switch. All electronics and relay are inside the
switch assembly.
The wiper system completes the wipe cycle when
the switch is turned OFF. The blades park in the
lowest portion of the wipe pattern.
The wiper switch also includes the MIST feature
which provides a single wipe when actuated.
DESCRIPTION AND OPERATION
WIPER BLADES
Wiper blades, exposed to the weather for a long
period of time, tend to lose their wiping effectiveness.
Periodic cleaning of the wiper blade is suggested to
remove the accumulation of salt and road film. The
wiper blades, arms, and windshield should be
cleaned with a sponge or cloth and a mild detergent
or nonabrasive cleaner. If the blades continue to
streak or smear, they should be replaced. The right
and left wipers are different blade lengths. The
driver side length is 550 mm and the passenger side
length is 475 mm. The blades should not be inter-
changed.
PLWINDSHIELD WIPER and WASHER SYSTEMS 8K - 1

DIAGNOSIS AND TESTING
WINDSHIELD WIPER CONDITIONS
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M, PASSIVE
RESTRAINT SYSTEMS FOR STEERING WHEEL
REMOVAL AND INSTALLATION.
The following is a list of general wiper motor sys-
tem problems, the tests that are to be performed to
locate the faulty part, and the corrective action to be
taken.
Whatever the problem, disconnect motor wire har-
ness and clean the terminals, then connect motor
wire harness and test.
Refer to Group 8W Wiring Diagrams for circuit
information and connector call-outs.
MOTOR WILL NOT OPERATE IN SOME OR ALL
SWITCH POSITIONS
(1) Check fuse 1, in the fuse block (Fig. 1).
(a) If fuse is OK, go to Step 2.
(b) If fuse is defective, replace and check motor
operation in all switch positions.
(c) If motor is still inoperative and the fuse does
not blow, go to Step 2.
(d) If replacement fuse blows, go to Step 6.
(2) Disconnect motor harness connector.(3) Check motor low speed. Using two jumper
wires, connect one jumper wire between the battery
positive terminal and terminal 4 of the motor connec-
tor. Connect the other jumper wire to the battery
negative terminal and the motor ground strap (Fig.
2). Check motor high speed, connect the positive
jumper wire to terminal 5 of the motor connector.
Connect the negative jumper wire to the motor
ground strap.
(a) If motor does not run in high or low speed go
to Step 4.
(b) If motor does run, go to Step 5.
(4) Using an ohmmeter, check for good ground at
the motor ground strap. If OK, replace motor. If not
repair the ground circuit as necessary.
(5) Check terminal 2 of wiper switch connector for
continuity to ground. If OK, go to Step 6. If not OK,
repair the ground circuit as necessary.
(6) Using a voltmeter, with wiper switch con-
nected, connect negative lead to motor ground strap.
Connect the positive lead to terminal 4 of the wiper
switch connector (Fig. 3).
Fig. 1 Fuse Block
1 ± FUSE 1 WIPER
Fig. 2 Windshield Wiper Motor Connector
Fig. 3 Windshield Wiper Switch Connector
8K - 2 WINDSHIELD WIPER and WASHER SYSTEMSPL

(a) If no voltage, repair wiring as necessary. If
OK, go to Step b.
(b) Check wiper switch low speed. Connect volt-
meter positive lead to terminal 6 of the wiper
switch connector. Move wiper stalk to LOW posi-
tion. If no voltage, replace switch.
(c) Check wiper switch high speed, connect volt-
meter positive lead to terminal 5 of the wiper
switch connector. Move wiper stalk to HIGH posi-
tion. If no voltage, replace switch.
(7) Disconnect motor connector and replace fuse 1
in fuse block.
(a) If fuse does not blow, replace motor.
(b) If fuse blows, disconnect wiper switch and
replace fuse.
(c) If fuse does not blow, replace switch.
(d) If fuse blows, repair wiring as necessary.
MOTOR OPERATES SLOWLY AT ALL SPEEDS
(1) Remove wiper arms and cowl screen. Discon-
nect motor linkage from motor. Connect an ammeter
between battery positive terminal and terminal 4 of
the motor connector. Turn wiper motor on and check
ampere reading.
If motor runs and ammeter reading is more than 6
amps, go to Step 2. If less than 6 amps, go to Step 3.
When replacing drive link nut tighten to 11 to 12
N´m (98 to 106 in. lbs.) torque.
(2) Using an ohmmeter, check the high and low
circuits for a short to ground. Refer to Group 8W,
Wiring Diagrams.
(3) Check to see if wiper linkage or pivots are
binding or caught.
WIPERS RUN AT HIGH SPEED WITH SWITCH IN
LOW SPEED POSITION OR WIPERS RUN AT LOW
SPEED WITH SWITCH IN HIGH SPEED POSITION.
(1) Check for crossed wires in the motor pigtail
wire connector. Refer to Group 8W, Wiring Diagrams.
(2) Check for crossed wires in harness connector
from wiper switch to motor.
(3) If OK, replace wiper switch.
WIPERS WILL OPERATE CONTINUOUSLY WITH
THE SWITCH IN THE INTERMITTENT POSITION -
WHEN WIPER SWITCH IS TURNED OFF, WIPERS
STOP WHEREVER THEY ARE WITHOUT
RETURNING TO PARK POSITION.
(1) Check at motor ground strap for a good ground.
(2) Turn ignition switch OFF. Disconnect the wiper
switch harness connector. Using an ohmmeter with
the motor in the park position, check for continuity
between terminal 2 of the wiper switch harness con-
nector (Fig. 4) and the ground strap. If continuity,
replace wiper switch. If no continuity, repair wiring
as necessary.
WIPERS DO NOT OPERATE WHEN WASHER
MOTOR IS ENGAGED (PULSE WIPE) OR WIPERS
DO OPERATE IN INTERMITTENT POSITION.
Check for a good ground at motor ground strap and
at wiper switch terminal 2. If OK, replace wiper
switch. If not OK, repair wiring as necessary.
WINDSHIELD WIPER MOTOR
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
STEERING WHEEL OR COLUMN REMOVAL PROCE-
DURES.
Whenever a wiper motor malfunction occurs, verify
that the wire harness is properly connected, then
start normal diagnosis and repair procedures. Refer
to Wiper Motor Test table.
Fig. 4 Windshield Wiper Switch Harness Connector
PLWINDSHIELD WIPER and WASHER SYSTEMS 8K - 3
DIAGNOSIS AND TESTING (Continued)

WIPER MOTOR TEST
CONDITION POSSIBLE CAUSES CORRECTION
WIPER BLADES DO NOT
PARK PROPERLY.(1) WIPER ARMS IMPROPERLY
PARKED.
(2) WIPER ARMS ARE LOOSE ON
PIVOT SHAFT.
(3) MOTOR CRANK LOOSE AT
OUTPUT SHAFT.(1) REMOVE WIPER ARMS AND
REPARK. REFER TO WIPER ARM
REMOVAL AND INSTALLATION.
(2) REMOVE WIPER ARM AND
REPARK. REFER TO WIPER ARM
REMOVAL AND INSTALLATION.
(3) REMOVE WIPER ARM, RUN WIPER
MOTOR TO PARK POSITION AND
REMOVE THE MODULE. WITHOUT
ROTATING THE MOTOR OUTPUT
SHAFT, REMOVE THE CRANK AND
CLEAN ANY FOREIGN MATTER FROM
THE MOTOR SHAFT. INSTALL THE
MOTOR CRANK IN ITS ORIGINAL
POSITION.
MOTOR STOPS IN ANY
POSITION WHEN THE
SWITCH IS TURNED
OFF.(1) OPEN PARK CIRCUIT. (1) CHECK PARK SWITCH BY
DISCONNECTING THE WIRE
CONNECTOR AND APPLY BATTERY
VOLTAGE TO PIN 4. PLACE A JUMPER
WIRE FROM PIN 2 TO PIN 3 AND THEN
TO AN EXTERNAL GROUND. REPLACE
MOTOR IF IT DOES NOT PARK.
MOTOR WILL NOT STOP
WHEN THE SWITCH IS
TURNED OFF.(1) FAULTY SWITCH.
(2) LOCK OF DYNAMIC BRAKE
ON WET GLASS.(1) CHECK SWITCH IN LOW, HIGH AND
INTERMITTENT POSITION.
(2) ENSURE PARK SWITCH HAS
CLEAN GROUND.
WIPER BLADES SLAP
AGAINST COWL
SCREEN OR WINDOW
MOLDINGS.(1) WIPER ARMS ARE PARKED
INCORRECTLY.(1) PARK WIPER ARMS. REFER TO
WIPER ARM ADJUSTMENT.
BLADES CHATTER. (1) FOREIGN SUBSTANCE SUCH
AS POLISH ON GLASS OR
BLADES.
(2) ARMS TWISTED, BLADE AT
WRONG ANGLE ON GLASS.
(3) BLADE STRUCTURE BENT.
(4) BLADE ELEMENT HAS
PERMANENT SET.(1) CLEAN GLASS AND BLADE
ELEMENT WITH NON-ABRASIVE
CLEANER.
(2) REPLACE ARM.
(3) REPLACE BLADE.
(4) REPLACE BLADE ELEMENT.
WIPER KNOCK AT
REVERSAL.(1) LINKAGE BUSHINGS WORN.
(2) ARMATURE ENDPLAY IN
MOTOR.(1) REPLACE WORN LINK. REFER TO
WIPER LINKAGE REMOVAL AND
INSTALLATION.
(2) REPLACE WIPER MOTOR. REFER
TO WIPER MOTOR REMOVAL AND
INSTALLATION.
WIPER MOTOR WILL
NOT RUN.(1) BLOWN FUSE.
(2) NEW FUSE BLOWS.
(3) NEW FUSE BLOWS.
(4) NO VOLTAGE AT MOTOR.
(5) POOR GROUND.(1) REPLACE FUSE, AND RUN
SYSTEM.
(2) CHECK FOR SHORT IN WIRING OR
SWITCH.
(3) REPLACE FUSE, REMOVE MOTOR
CONNECTOR, TURN SWITCH ON,
FUSE DOES NOT BLOW, REPLACE
MOTOR.
(4) CHECK SWITCH AND WIRING
HARNESS. REFER TO GROUP 8W,
WIRING DIAGRAMS.
(5) REPAIR GROUND WIRE
CONNECTION AS NECESSARY.
8K - 4 WINDSHIELD WIPER and WASHER SYSTEMSPL
DIAGNOSIS AND TESTING (Continued)