1993 CHEVROLET DYNASTY wheel

(4) Connect a jumper wire between pin 2 of the
four-way servo connector of the main harness and
pin 2 of the vehicle speed control servo (Fig. 12). The
other three pins from the servo should show battery
voltage. If not, replace the servo. (5) Using an ohmmeter, connect one lead to a good
body ground and the other lead touch pin 1 in the
four-way servo connector of the main harness. The
meter should show continuity. If not, repair the
ground circuit as necessary.
POWERTRAIN CONTROL MODULE ELECTRICAL
TEST
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
AIRBAG, STEERING WHEEL OR COLUMN RE-
MOVAL PROCEDURES.
(1) Unplug 60-way connector from the powertrain
control module, located next to the battery (Fig. 13). (2) Remove vehicle speed control switch. Refer to
Vehicle Speed Control Switch Removal. Disconnect
the 4-way connector. (3) Using an ohmmeter test continuity between pin
23 of powertrain control module and pin 4 of the ve-
hicle speed control switch harness. Refer to Fig. 14
for controller terminal locations. (a) If no continuity, repair wire circuit as neces-
sary. (b) Continuity OK, refer to Vehicle Speed Con-
trol Switch Test.
(4) Connect the 4-way connector to vehicle speed
control switch. (5) Connect negative lead of voltmeter to a good
body ground near the powertrain control module. (6) Turn ignition switch ON.
(7) Place vehicle speed control switch in the OFF
position. Touch the positive lead of the voltmeter to
pin 53, the voltmeter should read 0 volts. (8) Place vehicle speed control switch in the ON
position. Touch the positive lead of the voltmeter to
pin 53, the voltmeter should read battery voltage. (9) If no voltage, repair the wire between pin 53
and pin 3 of the vehicle speed control servo (Fig. 6).
If voltage is OK go to step 8. (10) Place vehicle speed control switch in the OFF
position. Touch the positive lead of the voltmeter to
pin 33, voltmeter should read 0 volts. (11) Place vehicle speed control switch in the ON
position. Touch the positive lead of the voltmeter to
pin 33, the voltmeter should read battery voltage. (12) If no voltage, repair the wire between pin 33
and pin 4 of the vehicle speed control servo (Fig. 6).
If voltage is OK go to step 11.
Fig. 8 Vehicle Speed ControlÐAC & AY Bodies with 3.3/3.8L
Ä VEHICLE SPEED CONTROL 8H - 5

(4) Disconnect electrical connector and vacuum
hose. (5) Pull cable away from servo to expose retaining
clip and remove clip attaching cable to servo.
INSTALLATION
(1) With throttle in full open position align hole in
vehicle speed control cable sleeve with hole in servo
pin and install retaining clip. (2) Connect vacuum hose to servo.
(3) Connect electrical connector.
(4) Position mounting bracket and install screws
attaching bracket and tighten to 12 N Im (105 in.
lbs.) torque. (5) Insert servo studs through holes in vehicle
speed control cable and mounting bracket. (6) Install nuts, tighten to 7 N Im (60 in. lbs.)
torque.
VEHICLE SPEED CONTROL SWITCH REMOVAL
The vehicle speed control switch is mounted in the
steering wheel and wired through the clock spring
device under the steering wheel hub (Fig.1).
WARNING: IF REMOVAL OF AIR BAG MODULE IS
NECESSARY, REFER TO GROUP 8M, RESTRAINT
SYSTEMS.
REMOVAL
(1) Turn off ignition.
(2) Remove two screws from back side of steering
wheel. (3) Rock switch away from air bag or horn pad
while lifting switch out of steering wheel. (4) Disconnect 4-way electrical connector.
INSTALLATION
(1) Turn off ignition.
(2) Connect 4-way electrical connector from clock
spring to switch. (3) Place switch in steering wheel, sliding the for-
ward edge of switch under air bag or horn pad. Line
up locating pins on switch with holes in steering
wheel frame. (4) Attach switch to wheel with two screws start-
ing with the screw at the left end of the switch.
8H - 10 VEHICLE SPEED CONTROL Ä

TURN SIGNALS AND HAZARD WARNING FLASHER
CONTENTS
page page
AG AND AJ BODIES ..................... 1
CHIME FUNCTIONÐAC, AG, AJ AND AY .... 1
DUAL-FUNCTION SWITCHÐAG AND AJ BODIES.5
GENERAL INFORMATION .................. 1
HAZARD WARNING SYSTEM .............. 1
MULTI-FUNCTION SWITCHÐAA, AC, AP AND AY BODIES .............................. 2 REMOTE TURN SIGNAL SWITCH REMOVALÐAG
AND AJ BODIES ....................... 5
TESTING PROCEDURES ................... 2
TURN SIGNAL AND HAZARD WARNING FLASHER LOCATION ............................ 6
TURN SIGNAL RELAYSÐAG AND AJ BODIES . 6
GENERAL INFORMATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
AIRBAG REMOVAL PROCEDURES.
TURN SIGNALSÐAC, AY, AA AND AP BODIES
The turn signals are part of the multi-function switch.
Which contains electrical circuitry for turn signal, cor-
nering lamps, hazard warning, headlamp beam select,
headlamp optical horn, windshield wiper, pulse wipe
and windshield washer switching. The integrated switch
assembly is mounted to the left hand side of the steer-
ing column. When the driver wishes to signal his inten-
tions to change direction of travel, he moves the lever
upward to cause the right signals to flash and down-
ward to cause the left signals to flash. After completion
of a turn the system is deactivated automatically. As
the steering wheel returns to the straight ahead posi-
tion, a canceling cam of two lobes molded to the clock-
spring mechanism comes in contact with the cancel
actuator on the turn signal multi-function switch as-
sembly. Either cam lobe, pushing on the cancel actua-
tor, returns the switch to the off position. If only momentary signaling such as indication of a
lane change is desired, the switch is actuated to a left
or right intermediate detent position. In this position
the signal lamps flash as described above, but the
switch returns to the OFF position as soon as the lever
is released.
When the system is activated, 1 of 2 indicator
lamps mounted in the instrument cluster flashes in
unison with the turn signal lamps, indicating to the
driver that the system is operating.
AG AND AJ BODIES
The turn signals are actuated with lever on the left
side of the instrument panel switch pod. When the
driver wishes to signal his intentions to change di- rection of travel, he moves the lever upward to cause
the right signals to flash and downward to cause the
left signals to flash. After completion of a turn the system is deacti-
vated automatically. The cancellation switch in the
steering column sends a signal to a remote turn sig-
nal switch in the switch pod to cancel the turn signal
function. As the steering wheel returns to the
straight ahead position from a turn, a cancel cam
which is located on the steering wheel contacts a
cancel flipper located on the cancellation switch.
When the flipper is contacted by the cancel cam in
the proper rotational direction, the cancel switch
sends a signal to the remote turn signal switch. If only momentary signaling such as indication of a
lane change is desired, the switch is actuated to a
left or right intermediate detent position. In this po-
sition the signal lamps flash as described above, but
the switch returns to the OFF position as soon as the
lever is released. When the system is activated, 1 of 2 indicator
lamps mounted in the instrument cluster flashes in
unison with the turn signal lamps, indicating to the
driver that the system is operating.
HAZARD WARNING SYSTEM
The hazard warning system is actuated by a push
button located on the top of the steering column be-
tween the steering wheel and the instrument panel.
The hazard switch is identified with a double trian-
gle on top of the button. Push and release the button
to turn the hazard function ON or OFF. The button
will move out from the steering column in the ON
position and will remain in toward the column in the
OFF position.
CHIME FUNCTIONÐAC, AG, AJ AND AY
The chime will sound after the vehicle has traveled
a distance of 0.6 miles at a speed above 15 miles per
hour.
Ä TURN SIGNALS AND HAZARD WARNING FLASHER 8J - 1

WINDSHIELD WIPER AND WASHER SYSTEMS
CONTENTS
page page
GENERAL WIPER INFORMATION ........... 1
INTERMITTENT WINDSHIELD WIPER MOTOR AND SWITCH SERVICE PROCEDURES .... 12
WINDSHIELD WASHERS ................. 17 WINDSHIELD WIPER BLADE AND ARM SERVICE
PROCEDURES ......................... 1
WINDSHIELD WIPER MOTOR AND LINKAGE ASSEMBLY SERVICE PROCEDURES ....... 3
GENERAL WIPER INFORMATION
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
STEERING WHEEL OR COLUMN REMOVAL PROCE-
DURES.
The windshield wipers can be operated with the
windshield wiper switch only when the ignition
switch is in the ACCESSORY or IGNITION position.
A fuse, located in the fuse block, protects the cir-
cuitry of the wiper system and the vehicle. The wiper motor has permanent magnet fields. The speeds are determined by current flow to the appro-
priate set of brushes. The intermittent wipe system, in addition to low
and high speed, has a delay mode. The delay mode
has a range of 2 to 15 seconds. This is accomplished
by a variable resistor in the wiper switch and is con-
trolled electrically by a relay. The wiper system completes the wipe cycle when
the switch is turned OFF. The blades park in the
lowest portion of the wipe pattern.
WINDSHIELD WIPER BLADE AND ARM SERVICE PROCEDURES
WIPER BLADES
Wiper blades, exposed to the weather for a long pe-
riod 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 nona-
brasive cleaner. If the blades continue to streak or
smear, they should be replaced.
WIPER BLADE ELEMENT CHANGE
(1) Turn wiper switch ON, position blades to a con-
venient place by turning the ignition switch ON and
OFF. (2) Lift wiper arm to raise blade off glass.
(3) Remove blade assembly from arm by inserting
a small screwdriver blade into release slot of wiper
blade and push downward (Fig. 1 and 2), or push re-
lease button (2). (4) To remove wiping element from blade assem-
bly:
² Place blade assembly on a working surface
² Apply pressure backwards to open up the blade as-
sembly (Fig. 3)
² By pushing downward and pulling away remove
the wiping element, or lift tab on one end links and
squeeze link to remove from center bridge.
Fig. 1 Wiper Blade and Element
Fig. 2 Blade Assembly from Arm
Ä WINDSHIELD WIPER AND WASHER SYSTEMS 8K - 1

(3) Secure arm to pivot with attaching nut and
tighten 17 to 22 N Im (155 to 195 in. lbs.) torque.
(4) Close head cover and remove pin from arm pin
hole.
WIPER ARM ADJUSTMENT
FRONT ARM ADJUSTMENT
(1) Cycle the wiper motor into the PARK position.
(2) Check the tips of the blades in blackout area.
From the bottom edge of the windshield to the blade
should be no closer than 25 mm (1 inch) (Fig. 8). (3) Operate the wipers if the requirements are not
met, check linkage and pivot assembly for worn
parts.
REAR ARM ADJUSTMENT
With the motor in the park position, mount the
arm on the motor shaft. Choose a serration engage-
ment that positions the blade, parallel with the bot-
tom edge of the liftgate glass.
WINDSHIELD WIPER MOTOR AND LINKAGE ASSEMBLY SERVICE PROCEDURES
INDEX
page page
Front Wiper Motor AssemblyÐAG and AJ Bodies . 6
Rear Wiper Motor AssemblyÐAG Body ........ 8
Rear Wiper MotorÐAG Body Test ............ 6 Wiper Motor and Linkage AssemblyÐAA, AC, AY
Bodies ................................ 8
Wiper Motor and Linkage AssemblyÐAP Body . . 10
Wiper Motor System Test Procedures .......... 3
WIPER MOTOR SYSTEM TEST PROCEDURES
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
STEERING WHEEL OR COLUMN REMOVAL PROCE-
DURES.
Whenever a wiper motor malfunction occurs, first
verify that the wiper motor wire harness is properly
connected to all connectors before starting normal di-
agnosis and repair procedures. Refer to Wiper Motor
Diagnosis Chart (Fig. 9). 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. These tests will cover both two speed and in-
termittent wipe functions.
TWO SPEED MOTOR FUNCTION TESTS
CONDITION: MOTOR WILL NOT RUN IN ANY SWITCH POSITION
PROCEDURE
(1) Check for a blown fuse in the fuse block. (a) If fuse is good, proceed 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, proceed to step 2. (d) If replacement fuse blows, proceed to step 5.
(2) Place switch in LOW speed position.
(3) Listen to motor. If you cannot hear it running,
proceed to Step 4. If you hear it running, check motor
output shaft. If output shaft is not turning, replace
motor assembly. If it is turning, drive link to output
shaft or linkage is not properly connected. Replace
worn parts and/or properly connect drive link to the
motor output shaft. (4) Connect a voltmeter between motor terminal 3
and ground strap (Fig. 10). If there is no voltage or very
little voltage (less than one volt) present, move nega-
tive test lead from the ground strap to negative battery
terminal. (a) If an increase in voltage is noticed, the problem
is a bad ground circuit. Make sure the motor mount-
ing is free of paint and that nuts or bolts are tight. (b) If there is still no indication of voltage, the
problem is an open circuit in the wiring harness or
wiper switch. (c) If no more than 3 volts increase in voltage is
observed, the problem is a faulty motor assembly.
(5) Disconnect motor wiring connector and replace
fuse. (a) If fuse does not blow, motor is defective.
(b) If fuse blows, switch or wiring is at fault.
Fig. 8 Windshield Wiper Arm Adjustment
Ä WINDSHIELD WIPER AND WASHER SYSTEMS 8K - 3

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

WIPER SWITCH SERVICE PROCEDURE
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
STEERING WHEEL OR COLUMN REMOVAL PROCE-
DURES.
AC AND AY BODIES
The wiper switch is part of the multi-function
switch assembly. If the wiper switch fails, the multi-
function switch must be replaced. Refer to Group 8J,
Turn Signals and Hazard Warning Flasher for multi-
function switch service procedure.
AG AND AJ BODIES
REMOVAL
(1) Remove switch pod assembly from instrument
panel. (2) Remove five inner switch pod panel.
(3) Unhook switch linkage from buttons.
(4) Remove switch mounting screws.
(5) Remove switch.
INSTALLATION (1) Latch switch linkage in the up position.
(2) Insert switch into switch pod and install
mounting screws. (3) Unlatch linkage and install onto push buttons.
(4) Operate all switch modes for correct operation.
(5) Reinstall five inner switch pod panel screws.
(6) Reinstall switch pod assembly.
PULSE INTERMITTENT WINDSHIELD WIPER
CONTROLLER (PIWWC)
The controller is a part of the washing and wiper
system which includes:
² Pulse intermittent windshield wiper controller
² Wiper blades and arms
² Wiper motor
² Windshield washer reservoir
² Wiring harness
² Windshield washer pump
² Windshield washer hoses
Any part not working properly could cause, the
whole system not to work properly or at all. If the
system is not working proper, check all parts before
taking any action of part replacements.
The controller controls the pulse/wipe and the inter-
mittent modes only. The time delay in the intermittent
wipe mode is a minimum of 45 to a maximum of 25 sec-
onds depending on the switch setting.
The wash function can be turn ON with the wiper
control switch in the OFF position. Pressing the
wash button on the end of the level will operate the
washer pump until released. The wipers will operate
while the pump is operating and continue for about
three addition wipes ( 61) after before parking.
AA BODY
The PIWWC (Fig. 26) is attached to a bracket lo-
cated to the right of the steering column behind the
steering column cover (Fig. 27).
AP BODY
The PIWWC is attached to a bracket located to the
right of the steering column behind the steering col-
umn cover (Fig. 28).
Fig. 25 Front Wiper ContinuityÐAG and AJ Bodies
Fig. 26 Pulse Intermittent Windshield Wiper Controller (PIWWC)
Ä WINDSHIELD WIPER AND WASHER SYSTEMS 8K - 15

CONCEALED HEADLAMPS INDEX
page page
Concealed Headlamp MotorÐAC-Body ........ 29
Diagnostic Procedures ..................... 27
General Information ....................... 27 Headlamp DoorÐAC-Body
................. 29
Headlamp DoorÐAY Body ................. 29
Headlamp Drive MotorÐAY Body ............ 30
GENERAL INFORMATION
For proper operation of the Concealed Headlamp
System, refer to the Owner's Manual provided with
the vehicle.
The Concealed Headlamps are controlled by the Body
Controller (Fig. 1). Refer to Group 8E, Instrument
Panel for service procedures. The Body Controller re-
ceives input information from the ignition switch, head-
lamp switch, and the headlamp dimmer switch. The Body Controller also controls the headlamp doors
when the Passing Lights (manually flashing bright
lights) are used. With the headlamp switch turned off,
actuating the headlamp dimmer switch will signal the
Body Controller to open the headlamp doors. The oper-
ator then has two seconds to flash the bright lights be-
fore the Body Controller closes the headlamp doors.
Holding the headlamp dimmer switch in the engaged
position will signal the Body Controller to keep the
headlamp doors open until the dimmer switch is re-
leased. Actuating the headlamp dimmer switch with the
parking lamps ON signals the Body Controller to open
the headlamp doors and keep them open until the head-
lamp switch is turned off.
AY and AC vehicles use a single motor, centrally
located behind the radiator grille, and linked to the
headlamp doors by a torsion bar. Refer to Service
Procedures for more information. The headlamp door drive motors are equipped with
a manual override hand wheel to open or close the
headlamp doors if a failure should occur or servicing
is required. Access to the handwheel can be gained
through a flap covered hole in the sight shield be-
hind the bumper fascia, and under the hood. Several
revolutions of the handwheel may be required to
move the headlamp doors.
DIAGNOSTIC PROCEDURES
Before diagnosing a problem with the headlamp
doors, check for possible collision damage, binding,
improperly installed assemblies, or freezing weather
conditions. When diagnosing an electrical problem, refer to:
² The Concealed Headlamps Electrical Diagnosis
chart in this section.
² The Wiring Diagrams Manual.
² The Headlamp Doors System section of the appro-
priate Body Diagnostic Procedures Manual.
PROBLEM
One headlamp door is inoperative when the head-
lamp switch is ON and the ignition switch is in the
RUN position. The other headlamp door operates
normally.
AC OR AY-VEHICLE BODY CHECK:
² Headlamp door pivot and crank for seizure.
² Headlamp torsion bar sleeve or clip for excessive
wear or breakage.
² Headlamp door crank for missing or broken screw.
² Headlamp torsion bar for disengagement or break-
age.
PROBLEM
Headlamp door operates erratically.
CHECK:
² For freezing weather conditions.
² For excessive effort to move headlamp door pivots.
² For corrosion or improperly aligned components.
² For stripped motor reduction gears.
² For defective body controller. Refer to the Con-
cealed Headlamp Electrical Diagnosis chart in this
section. Also refer to the Wiring Diagrams Manual
and Body Diagnostic Procedures Manual.
Fig. 1 Body Controller
Ä LAMPS 8L - 27