1993 CHEVROLET DYNASTY Service Manual

technical data oil dipstick torque gas tank size open hood towing

Page 625 of 2438

CHEVROLET DYNASTY 1993 Service Manual CONDITION: MOTOR RUNS SLOWLY AT ALL SPEEDS
PROCEDURE
(1) Disconnect wiring harness connector at motor.
Remove wiper arms and blades. Connect an ammeter
between battery (B+) and terminal 3 on motor (

CONDITION: MOTOR RUNS SLOWLY AT ALL SPEEDS
PROCEDURE
(1) Disconnect wiring harness connector at motor.
Remove wiper arms and blades. Connect an ammeter
between battery (B+) and terminal 3 on motor (Fig.
11).
(a) If motor runs and average ammeter reading
is more than 6 amps, proceed to step 2. (b) If motor runs and average ammeter reading
is less than 6 amps, proceed to step 3.
(2) Check to see if wiper linkage or pivots are
binding or caught. Disconnect drive link from motor. (a) If motor now runs and draws less than 3
amps, repair linkage system. (b) If motor continues to draw more than 3 amps,
replace motor assembly.
(3) Check motor wiring harness for shorting be-
tween high and low speed wires as follows: (a) Connect a voltmeter or test lamp to motor
ground strap. (b) Set wiper switch to LOW position.
(c) Connect other lead of voltmeter to terminal 4
of the wiring harness. (d) If voltage is present, there is a short in the
wiring or wiper switch. If no voltage is present pro-
ceed to step e. (e) Set wiper switch to HIGH position.
(f) Move voltmeter lead from terminal 4 to termi-
nal 3 of the wiring harness. (g) If voltage is present, there is a short in the
wiring or wiper switch.
CONDITION: MOTOR WILL RUN AT HIGH SPEED, BUT NOT AT LOW SPEED. MOTORWILL RUN AT LOW SPEED, BUT NOT AT HIGHSPEED
PROCEDURE
(1) If motor will not run on high speed, put switch
in HIGH position and connect a test lamp between
motor Terminal 4 and ground (Fig. 12).
(2) If motor will not run on low speed, put switch
in LOW position and connect a test lamp between
motor Terminal 3 and ground. (3) If test lamp does not light at motor terminal,
there is an open in wiring or switch. If test lamp
lights at motor terminal, replace motor assembly.
CONDITION: MOTOR WILL KEEP RUNNING WITH SWITCH IN OFF POSITION
PROCEDURE
Remove wiring harness. Connect jumper from Ter-
minal 1 to Terminal 3 of wiper motor (Fig. 13). Con-
nect second jumper from Terminal 2 to battery (B+).
If motor runs to PARK position and stops, wiper
switch is faulty. If motor keeps running and does not
park, replace motor assembly.
Fig. 10 Voltmeter Between Terminal 3 and Ground
Fig. 11 Ammeter Between Terminal 3 and Battery
Fig. 12 Test Lamp Between Terminal 4 and Ground
Ä WINDSHIELD WIPER AND WASHER SYSTEMS 8K - 5

Page 626 of 2438

CHEVROLET DYNASTY 1993 Service Manual CONDITION: MOTOR WILL STOP WHEREVER IT IS, WHEN COLUMN SWITCH IS PUT IN OFFPOSITION. THE WIPERS DO NOT CONTINUERUNNING TO PARK POSITION
PROCEDURE
(1) Remove motor wiring connector and clean ter-
min

CONDITION: MOTOR WILL STOP WHEREVER IT IS, WHEN COLUMN SWITCH IS PUT IN OFFPOSITION. THE WIPERS DO NOT CONTINUERUNNING TO PARK POSITION
PROCEDURE
(1) Remove motor wiring connector and clean ter-
minals. Reconnect connector and test motor.If prob-
lem persists, proceed to Step 2. (2) Set wiper switch to OFF position. Disconnect
motor wiring connector. Connect a voltmeter or test
lamp to the motor ground strap. Connect the other
lead to terminal 2 of wiring connector. (a) If voltage is not present, check for an open
circuit in the wiring harness or wiper control
switch. (b) If voltage is present, proceed to step 3.
(3) Connect an ohmmeter or continuity tester be-
tween terminals 3 and 1 (Fig. 14). (a) If there is continuity between these termi-
nals, the problem is a defective motor. (b) If there is no continuity, the problem is an
open circuit in the wiper control switch or wiring
harness.
REAR WIPER MOTORÐAG BODY TEST
The following test is used in order to locate and
then repair liftgate wiper motor defects. Refer to
Group 8W, Wiring Diagrams for liftgate wiper motor
wiring schematic. (1) Remove lower cover on liftgate (Fig. 15).
(2) Disconnect feed connector from wiper motor.
(3) With ignition switch in ON position, check for
battery voltage at blue wire. (4) With ignition switch in ON position and wiper
switch ON, check for battery voltage at blue and
brown wire. If battery voltage is not present in steps
3 and 4, check fuse, liftgate wiper switch and wiring. (5) With ignition switch in ON position, and wiper
switch in OFF position, check for battery voltage be-
tween blue and brown wires. If battery voltage is not
present, check ground wire to liftgate switch. (6) If battery voltage is present in steps 3 and 4,
replace motor.
FRONT WIPER MOTOR ASSEMBLYÐAG and AJ
BODIES
REMOVAL
(1) Park system.
(2) Open the hood assembly.
(3) Remove wiper arms and blades, disconnect
hoses from tee connector (Fig. 16).
Fig. 13 One Jumper Wire Between Terminal 1 and 3. One Jumper Wire Between Terminal 2 and Battery positive
Fig. 14 Ohmmeter Between Terminals 3 and 1
Fig. 15 Liftgate Lower Cover
8K - 6 WINDSHIELD WIPER AND WASHER SYSTEMS Ä

Page 627 of 2438

CHEVROLET DYNASTY 1993 Service Manual Fig. 16 Windshield Wiper Motor and LinkageÐAG and AJ Bodies
Ä WINDSHIELD WIPER AND WASHER SYSTEMS 8K - 7

Page 628 of 2438

CHEVROLET DYNASTY 1993 Service Manual (4) Remove the cowl top plastic screen.
(5) Remove pivot screws.
(6) Remove wiper motor cover and disconnect wiring
harness. (7) Remove three motor mounting nuts.
(8) Push pivots down into plenum cha

(4) Remove the cowl top plastic screen.
(5) Remove pivot screws.
(6) Remove wiper motor cover and disconnect wiring
harness. (7) Remove three motor mounting nuts.
(8) Push pivots down into plenum chamber and pull
motor out until it clears the mounting studs. Then
move it as far to the drivers side or outboard as it will
go. Pull right pivot and link out through opening. Shift
motor to opposite side or inboard of opening and
remove motor, left link and pivot. (9) Clamp motor crank in a vise and remove nut
from end of motor shaft. Do not rotate motor output
shaft from PARK position.
INSTALLATION
(1) Assemble linkage to motor. Make sure crank fits
over D slot on motor shaft. Tighten mounting nut to 10
to 11 N Im (90 to 100 in. lbs.) torque. Be sure motor is
still in park position before assembling to linkage, if
not temporarily connect motor to wiring and operate
switch to position motor in park before assembling
linkage. (2) Place left pivot and link into plenum chamber.(a) Slide it all the way to the left or outboard side
until motor clears studs and crank is behind sheet
metal. (b) Push right pivot and link through opening.
(c) Move assembly right and position motor on
studs.
(3) Install three motor mounting nuts and tighten 7
to8N Im (60 70 in. lbs.) torque.
(4) Position pivots and install pivot screws and
tighten 7 to 8 N Im (60 to 70 in. lbs.) torque.
(5) Connect wiring to motor.
(6) Install motor cover. Tighten screws to 4 N Im (35
in. lbs.) torque. (7) Attach reservoir hose to T-connector through hole
provided in cowl screen. (8) Use plastic fasteners to install cowl screen.
(9) Install arm and blade assemblies. Refer to Wiper
Arm Adjustment. Connect arm washer hoses to
T-connector.
REAR WIPER MOTOR ASSEMBLYÐAG BODY
REMOVAL
(1) Remove arm and blade assembly, refer to Arm
and Blade Removal. (2) Unlock and open liftgate.
(3) Remove trim panel refer to Group 23, Body.
(4) Disconnect feed wire connector from motor.
(5) Remove grommet from liftgate glass (Fig. 17). (6) Remove two screws fastening bracket to liftgate
(Fig. 18).
(7) Remove motor from liftgate.
INSTALLATION
(1) Install new grommet in liftgate glass.
(2) Position motor to liftgate and secure with two
screws. Tighten screws 7 to 8 N Im (60 to 70 in. lbs.)
torque. (3) Connect feed wires to motor.
(4) Install trim panel.
(5) Install and adjust arm and blade assembly re-
fer to Arm Assembly. Tighten nut 17 to 19 N Im (150
to 170 in. lbs.) torque.
WIPER MOTOR AND LINKAGE ASSEMBLYÐAA,
AC, AY BODIES
REMOVAL
(1) Open hood assembly.
(2) Remove wiper arms (Fig. 19 and 20).
Fig. 17 Liftgate Wiper Grommet
Fig. 18 Liftgate Wiper MotorÐAG Body
8K - 8 WINDSHIELD WIPER AND WASHER SYSTEMS Ä

Page 629 of 2438

CHEVROLET DYNASTY 1993 Service Manual Fig. 19 Windshield Wiper Motor and LinkageÐAC and AY Bodies
Ä WINDSHIELD WIPER AND WASHER SYSTEMS 8K - 9

Page 630 of 2438

CHEVROLET DYNASTY 1993 Service Manual (3) Remove cowl top plastic cover.
(4) Remove three attaching screws from each pivot.
(5) Disconnect the wiper motor wiring harness.
(6) Remove three bolts that attach motor mounting
bracket to body.

(3) Remove cowl top plastic cover.
(4) Remove three attaching screws from each pivot.
(5) Disconnect the wiper motor wiring harness.
(6) Remove three bolts that attach motor mounting
bracket to body. (7) Remove wiper motor, bracket, and linkage as-
sembly from cowl plenum. (8) Clamp motor crank in a vise and remove nut
from end of motor shaft. Do not rotate motor out-
put shaft from PARK position.
INSTALLATION
(1) Assemble linkage to motor. Make sure crank
fits over D slot on motor shaft. Tighten mounting nut
10 to 11 N Im (90 to 100 in. lbs.) torque. Be sure mo-
tor is still in park position before assembling to link-
age, if not temporarily connect motor to wiring and
operate switch to position motor in park before as-
sembling linkage. (2) Install wiper motor, bracket, crank and linkage
assembly into cowl plenum. (3) Loosely install pivots and hose connector with
three attaching screws. (4) Secure motor mounting bracket screws to body
and tighten to 7 to 8 N Im (60 to 70 in. lbs.) torque.
(5) Tighten pivot attaching screws to 7 to 8 N Im
(60 to 70 in. lbs.) torque. (6) Attach wiper motor wiring harness. (7) Cycle wiper motor and turn OFF. To ensure
wiper motor is in the park position. (8) Install cowl top plastic cover.
(9) Install and adjust wiper arm assembly tighten
to 17 to 19 N Im (150 to 170 in. lbs.) torque.
WIPER MOTOR AND LINKAGE ASSEMBLYÐAP
BODY
REMOVAL
(1) Open hood assembly.
(2) Remove wiper arms (Fig. 21).
(3) Remove cowl top plastic cover.
(4) Disconnect the wiper motor wiring harness.
(5) Remove retaining nuts from the pivot mount-
ing studs. (6) Remove the three bolts that attach motor
mounting bracket to body. (7) Remove wiper motor, bracket, and linkage as-
sembly from cowl plenum. (8) Clamp motor crank in a vise and remove nut
from end of motor shaft. Do not rotate motor out-
put shaft from PARK position.
INSTALLATION
(1) Assemble linkage to motor. Make sure crank
fits over D slot on motor shaft. Tighten mounting nut
10 to 11 N Im (90 to 100 in. lbs.) torque. Be sure mo-
Fig. 20 Windshield Wiper Motor and LinkageÐAA Body
8K - 10 WINDSHIELD WIPER AND WASHER SYSTEMS Ä

Page 631 of 2438

CHEVROLET DYNASTY 1993 Service Manual tor is still in park position before assembling to link-
age, if not temporarily connect motor to wiring and
operate switch to position motor in park before as-
sembling linkage. (2) Install wiper mo

Page 632 of 2438

CHEVROLET DYNASTY 1993 Service Manual INTERMITTENT WINDSHIELD WIPER MOTOR AND SWITCH SERVICE PROCEDURES
INDEX
page page
Intermittent Windshield Wiper Switch Tests ..... 12
Intermittent Wipe Switch Test ............... 14
Intermitten

INTERMITTENT WINDSHIELD WIPER MOTOR AND SWITCH SERVICE PROCEDURES
INDEX
page page
Intermittent Windshield Wiper Switch Tests ..... 12
Intermittent Wipe Switch Test ............... 14
Intermittent Wiper Function Tests ............ 14
Intermittent Wiper Motor System Test ......... 12 Pulse Intermittent Windshield Wiper Controller
(PIWWC) .............................. 15
Standard Wiper Switch Test ................ 14
Wiper Switch Service Procedure ............. 15
INTERMITTENT WIPER MOTOR SYSTEM TEST
Intermittent Wiper Motor Service Procedures for
diagnosis of problems which do not involve the delay
function, refer to the Two-Speed Motor Function
Tests. The two-speed functions of all wiper motors
are identical. If a problem occurs, only in the DELAY mode, the
following tests are to be performed.
INTERMITTENT WINDSHIELD WIPER SWITCH
TESTS
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
STEERING WHEEL OR COLUMN REMOVAL PROCE-
DURES.
The intermittent wipe function on AC, AG, AJ and
AY vehicles is controlled by the body controller, lo-
cated in the passenger compartment behind the right
side kick panel (Fig. 22). If the body controller is de-
termined to be the problem, refer to Group 8E, In-
strument Panels and Gauges, for replacement
procedures.
CONDITION: WIPERS DO NOT COME ON WHEN THE SWITCH IS IN DELAY POSITION
PROCEDURE
(1) Disconnect 25-way connector (blue) from the
body controller. (2) Place wiper control switch in maximum DE-
LAY position. (3) Connect positive lead of voltmeter to pin 9 of
connector (blue) and negative lead to the good
ground. (a) If voltmeter reads 0, check control switch and
wiring for an open circuit. (b) If voltmeter reads 10 to 15 volts, proceed to
step 4.
(4) Connect positive lead of voltmeter to pin 22 of
blue connector and negative lead to a good ground. (a) If voltmeter reads 0, check fuses and wiring
for an open circuit. (b) If voltmeter reads 10 to 15 volts, reconnect
body controller and proceed to step 5.
(5) Connect positive lead of voltmeter to pin 24 of
blue connector and negative lead to the metal case of
the body controller. Disconnect wiring harness from
wiper motor. Set control switch to the minimum de-
lay mode. (a) If voltmeter reads 0, check wiring from the
intermittent wipe switch to body controller for an
open circuit. (b) If voltmeter reads 10 to 15 volts, proceed to
step 6.
(6) Connect voltmeter to pin L of the Intermittent
wiper switch. Place intermittent wiper switch in the
Max. Delay position. (a) If voltmeter reads zero volts, change the in-
termittent wiper switch. (b) If voltmeter reads 10-15 volts, check the wir-
ing harness from the intermittent wiper switch to
the wiper motor for an open circuit.
(7) If all tests above have been performed and the
problem was not found, replace the body controller.
Fig. 22 Body Controller Location
8K - 12 WINDSHIELD WIPER AND WASHER SYSTEMS Ä

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