1993 CHEVROLET DYNASTY engine

(2) Pry cover up and forward until released from
instrument panel pad. (3) Lift top cover upward and rearward to remove
from vehicle. (4) For installation place top cover on panel open-
ing. Be certain that blades of top cover are located in
the retaining spring clips. (5) Push forward and down to engage in pad.
INSTRUMENT PANEL REPLACEMENT
CAUTION: Disconnect negative battery cable, in en-
gine compartment, before servicing instrument
panel.
(1) Remove windshield wiper arms.
(2) Open hood and remove cowl top plastic cover.
(3) Remove windshield washer reservoir.
(4) Pull connector loose from the A/C resistor block
and push wiring and grommet through bulkhead into
passenger compartment. (5) Remove the console/consolette assembly.
(6) Remove the passive restraint seat belt logic
control module wiring. (7) Remove six attaching nuts securing the instru-
ment panel to console support brace. (8) Remove the instrument panel to console sup-
port brace with the Air Bag System Diagnostic Mod-
ule attached. (9) Remove right and left cowl side and scuff plate
trim moldings. (10) Remove left and right A-pillar trim moldings.
(11) Remove instrument panel top cover (Fig. 28).
(12) Remove lower steering column cover.
(13) Disconnect the steering column wiring at the
25-way connector. (14) Disconnect park brake, stop lamp and speed
control wiring. (15) Remove five steering column support nuts and
lower steering column. Then remove two steering col-
umn attaching studs. (16) Disconnect engine harness wiring at 18-way
and 16-way connectors located on the left side panel
support bracket. (17) Remove glove box assembly.
(18) Remove the panel top cover assembly.
(19) Loosen the panel roll-down pivot bolts.
(20) Remove the defroster duct adapter from de-
froster duct. (21) Remove screws which attach instrument panel
to windshield fence line. Roll panel down, attach
heavy wire to hold in position and remove defroster
duct retaining screws. (22) Disconnect body wiring at the right side
18-way connector and left side 25-way connector. (23) Disconnect temperature mode cable at in-line
connector. Disconnect resistor block and blower mo-
tor wiring connectors.
Fig. 28 Instrument Panel and Top Cover
8E - 72 INSTRUMENT PANEL AND GAUGES Ä

AUDIO SYSTEM
CONTENTS
page page
ANTENNAS ............................ 20
COMPACT DISC PLAYER ................. 30 RADIOS
................................ 1
SPEAKERS ............................ 24
RADIOS INDEX
page page
Audio Diagnostic Test Procedures ............. 1
Description .............................. 1
Interference Elimination ..................... 1
Radio Removal AP Body Replacement ........ 19 Radio RemovalÐAA Body
.................. 18
Radio RemovalÐAC and AY Bodies .......... 18
Radio RemovalÐAG and AJ Bodies .......... 18
DESCRIPTION
For operation of the factory installed standard and
optional radios and the optional compact disc player,
refer to the Sound Systems Operating Instructions
Manual supplied with the vehicle. All vehicles are equipped with an Ignition-Off
Draw Connector which, is used when the vehicles are
originally shipped from the factory. This connector
which, is located near the battery, helps to prevent
battery discharge during storage. For specific connec-
tor type and location, refer to Group 8W, Wiring Di-
agrams. This connector is included in the radio memory cir-
cuitry and should be checked if the memory of time
or radio station programming is inoperative.
INTERFERENCE ELIMINATION
Some components are used on vehicles equipped
with a radio capacitor, to suppress radio frequency
interference/static. Capacitors are mounted in various locations, on the
generator either internal or external, internal to the
instrument cluster, and internal to the windshield
wiper motor. Ground straps are mounted from radio chassis to
instrument panel support structure, engine to cowl,
across engine mount on right hand side. On vehicles
with air conditioning there is a strap from evapora-
tor valve to cowl. These ground straps should be se-
curely tightened to assure good metal to metal
contact. Ground straps conduct very small high fre-
quency electrical signals to ground and require clean
large surface area contact. Radio resistance type spark plug cables in the high
tension circuit of the ignition system complete the in-
terference suppression (Fig. 1).
If radio noises are evident, be sure the capacitor
lead wires are making good contact on their respec-
tive terminals and are securely mounted. Faulty or
deteriorated spark plug wires should be replaced.
AUDIO DIAGNOSTIC TEST PROCEDURES
Whenever a audio malfunction occurs, first verify
that the radio wire harness is properly connected to
all connectors before starting normal diagnosis and
repair procedures. Refer to Audio Diagnostic Charts
and/or Radio Connector Circuit Chart (Fig. 2).
Fig. 1 Resistance Type Spark Plug Cables
Ä AUDIO SYSTEM 8F - 1

Remove steering wheel horn pad and disconnect
wire from horn switch. Repeat the above test and if
the test lamp still illuminates, wire is shorted and
should be repaired. If test lamp does not illuminate,
horn switch is defective and must be replaced.
DIAGNOSIS TESTING
Horn does not sound, horn sounds intermittently,
or horn sounds continuously go to Horn Diagnosis
Chart (Fig. 9).
HORN SWITCH REPLACEMENT
WARNING: BEFORE BEGINNING ANY AIR BAG
SYSTEM REMOVAL OR INSTALLATION PROCE-
DURES, REMOVE AND ISOLATE THE NEGATIVE (-)
BATTERY CABLE (GROUND) FROM THE VEHICLE
BATTERY. THIS IS THE ONLY SURE WAY TO DIS-
ABLE THE AIR BAG SYSTEM. FAILURE TO DO
THIS COULD RESULT IN ACCIDENTAL AIR BAG
DEPLOYMENT AND POSSIBLE PERSONAL INJURY. (1) Disconnect and isolate negative battery cable
in engine compartment. (2) Remove four retaining nuts from back of steer-
ing wheel. Remove air bag module (Fig. 10 and 11). (a) Disconnect wire from rear of air bag module.
(b) Place air bag module on a clean level surface
with pad facing upward.
(3) Remove horn switch assembly from steering
wheel. (a) On luxury steering wheel (Fig. 10), pry out
two trim cover buttons on back of steering wheel to
access retaining screws for the horn switch. The
sport steering wheel (Fig. 11) the horn screws are
accessible after the Air Bag is removed. (b) Remove two screws and disconnect horn wires
located in the lower portion of steering wheel. Feed
wires through the access ports and remove horn
switch.
(4) For installation reverse the above procedures.
Use caution not to pinch wires.
Fig. 8 Testing Horn for Continuous SoundÐ AP and AA Bodies
Fig. 7 Testing for Short to GroundÐAC and AY Bodies
Ä HORNS 8G - 3

VEHICLE SPEED CONTROL
CONTENTS
page page
CHECKING FOR FAULT CODE .............. 3
DIAGNOSIS PROCEDURES ................ 2
GENERAL INFORMATION .................. 1
INOPERATIVE SYSTEM ................... 3
POWERTRAIN CONTROL MODULE ELECTRICAL TEST ................................ 5
ROAD TEST ............................ 2
SERVO ELECTRICAL TESTS ............... 4
SERVO UNIT ............................ 9 SERVO VACUUM TEST
................... 9
STOP LAMP VEHICLE SPEED CONTROL SWITCH TEST ......................... 8
VACUUM SUPPLY TEST .................. 9
VEHICLE SPEED CONTROL SWITCH REMOVAL ........................... 10
VEHICLE SPEED CONTROL SWITCH TEST . . . 8
VEHICLE SPEED CONTROL ELECTRICAL TESTS ............................... 3
GENERAL INFORMATION
The vehicle speed control is electronically con-
trolled and vacuum operated. The electronic control
is integrated into the powertrain control module, lo-
cated next to battery. The controls are located on the
steering wheel and consist of the ON/OFF, RESUME/
ACCEL and SET/DECEL buttons (Fig. 1). For iden-
tification and location of the major components (Fig.
2 through 8).
The system is designed to operate at speeds above
35 mph (50 km/h).
WARNING: THE USE OF VEHICLE SPEED CON-
TROL 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 SLIPPERY.
TO ACTIVATE: The ON/OFF button to the de-
pressed latched position, ON, the vehicle speed con-
trol function is now ready for use. TO DEACTIVATE:
A soft tap of the brake pedal,
normal brake application or depressing the clutch
pedal while the system is engaged will disengage ve-
hicle speed control without erasing memory. A sud-
den increase in engine rpm may be experienced if the
clutch pedal is depressed while the vehicle speed con-
trol is engaged. Pushing the ON/OFF button to the
unlatched position or turning off the ignition erases
the memory. TO SET SPEED: When the vehicle has reached
the desired speed push the SET/DECEL button to en-
gage system which will then automatically maintain
the desired speed. TO DECELERATE: When vehicle speed control is
engaged, holding the SET/DECEL button depressed
allows the vehicle to coast to a lower speed setting.
Fig. 1 Vehicle Speed Control Switch
Fig. 2 Vehicle Speed ControlÐ2.2L and 2.5L
Ä VEHICLE SPEED CONTROL 8H - 1

INOPERATIVE SYSTEM
If road test verifies an inoperative system with a
correct speedometer operation:
² Inspect fuse
² Check for loose electrical and vacuum connections
at the servo
² Check for correct position of the vacuum check
valve in the hose from servo to vacuum source. The
word VAC on the valve must point toward the vac-
uum source.
² Inspection should also be made to verify that both
ends of the vehicle speed control cable are securely
attached. If either end is loose, the vehicle speed con-
trol will be inoperative.
CHECKING FOR FAULT CODE
(1) When trying to verify a vehicle speed control
electronic malfunction: (a) Connect a DRB II if available.
(b) Plug DRB II into the diagnostic connector in
the engine compartment. (c) Check that either a Fault Code 34 or Fault
Code 15 is indicated. (d) An inoperative vehicle speed control may still
occur without either fault code being indicated. (e) With key inserted in ignition switch, cycle
switch to ON position three times. On third cycle,
leave switch in ON position. (f) After switch has been cycled three times, ob-
serve CHECK ENGINE indicator on instrument
cluster. If a Fault Code is present, indicator will
flash (blink) in a series which will show which
Fault Code is the problem. EXAMPLE: A series of
three flashes in rapid succession, a slight pause,
then four flashes in rapid succession would indicate
Fault Code 34.
(2) If no Fault Code appears, or Fault Code 34 is
observed, refer to:
² The Servo Electrical Test.
² The Powertrain Control Module Electrical Test.
(3) If a fault code 15 is observed, test vehicle speed
sensor. For testing vehicle speed sensor and related compo-
nents refer to the Powertrain Diagnostics Test Proce-
dure Manual. (4) Correct any problems found when performing
these tests and recheck for Fault Code if changes
were made. (5) If no problems were found above, replace pow-
ertrain control module.
VEHICLE SPEED CONTROL ELECTRICAL TESTS
WARNING: IF REMOVAL OF AIR BAG MODULE IS
NECESSARY, REFER TO GROUP 8M, RESTRAINT
SYSTEMS.
Fig. 6 Vehicle Speed ControlÐAC & AY Bodies with 2.5L
Ä VEHICLE SPEED CONTROL 8H - 3

(a) With brake pedal released, there should be
continuity:
² Between pin 1 and pin 4
² Between pin 3 and pin 6
² No continuity between pin 2 and pin 5
(b) With brake pedal depressed, there should be
no continuity:
² Between pin 1 and pin 4
² Between pin 3 and pin 6
² Continuity between pin 2 and pin 5
(2) If the above results are not obtained, the stop
lamp switch is defective or out of adjustment. (3) Stop lamp switch adjustment is detailed in
Group 5, Brakes.
VACUUM SUPPLY TEST
(1) Disconnect vacuum hose at the servo and in-
stall a vacuum gauge in the hose (Fig. 17).
(2) Start engine and observe gauge at idle. Vac-
uum gauge should read at least ten inches of mer-
cury. Shut off engine, the vacuum should continue to
hold 10 inches of mercury. (3) If vacuum does not meet this requirement,
check and correct the following vacuum leaks:
² Vacuum lines
² Check valve
² Vacuum reservoir
² Servo, refer to Servo Vacuum Test
² Poor engine performance
SERVO VACUUM TEST
(1) Remove the vehicle speed control cable at the
throttle body end. (2) Disconnect the 4-way electrical connector and
the vacuum harness at the servo (Refer to Fig. 12). (3) Connect battery voltage to pin 2 of the servo.
(4) Ground the remaining three servo pins 1, 3 and
4. (5) Connect a hand held vacuum pump to the servo
vacuum nipple and apply 10 to 15 inches of vacuum. (6) The cable should pull in and hold for as long as
vacuum is applied.
SERVO UNIT
REMOVAL
(1) Remove two nuts attaching vehicle speed con-
trol cable and mounting bracket to servo. (2) Remove screws attaching servo mounting
bracket. (3) Remove servo mounting bracket.
Fig. 15 Vehicle Speed Control Switch Continuity
Fig. 16 Stop Lamp and Vehicle Speed Control Switch Wiring
Fig. 17 Vacuum Gauge Test
Ä VEHICLE SPEED CONTROL 8H - 9

(3) Disconnect the wiring harness from the reser-
voir pump. (4) Disconnect the washer hose and block the liq-
uid outlet to prevent the liquid from running out
while removing the reservoir from engine compart-
ment.
INSTALLATION (1) Connect washer hose, wiring harness and in-
stall the reservoir in the plenum chamber. (2) Install sheet metal attaching screws. Tighten to
3N Im (24 in. lbs.) torque.
REAR WASHER RESERVOIR
REMOVAL
(1) Unlock and open liftgate.
(2) Remove right rear quarter panel inside trim as
necessary to gain access to reservoir (Fig. 34). (3) Remove two reservoir mounting screws.
(4) Disconnect wiring harness and filler tube from
reservoir and pump assembly. (5) Disconnect the washer hose and block the
pump outlet to prevent liquid from running out. (6) Remove reservoir and pump assembly from
rear quarter panel. INSTALLATION
(1) Position reservoir and pump assembly into the
right rear quarter panel. (2) Connect washer hose, wire harness and filler
tube to the reservoir and pump assembly. (3) Install two reservoir mounting screws.
(4) Install right rear quarter panel inside trim.
WASHER RESERVOIR PUMP
FRONT WASHER RESERVOIR PUMP
REMOVAL
(1) Remove liquid from reservoir.
(2) Remove reservoir mounting screws and remove
reservoir and pump assembly (Fig. 30 through 33). (3) Disconnect electrical lead and rubber hose from
bottom of pump. (4) Gently pry pump away from reservoir and out
of grommet. Care must be taken not to puncture res-
ervoir. (5) Remover rubber grommet from reservoir and
throw away.
INSTALLATION (1) Install new rubber grommet on reservoir.
(2) Position pump into place, and push in firmly
until it locks into grommet.
Fig. 30 Windshield Washer SystemÐAG and AJ Bodies
8K - 18 WINDSHIELD WIPER AND WASHER SYSTEMS Ä

LAMPS
CONTENTS
page page
BULB APPLICATION TABLE ............... 38
CONCEALED HEADLAMPS ................ 27
EXTERIOR LAMP SWITCHES AND HEADLAMP ALIGNMENT ........................... 3
EXTERIOR LAMP SYSTEMS .............. 25
EXTERIOR LAMPSÐAA BODY ............. 7
EXTERIOR LAMPSÐAC BODY ............ 10 EXTERIOR LAMPSÐAG BODY
............ 14
EXTERIOR LAMPSÐAJ BODY ............ 16
EXTERIOR LAMPSÐAP BODY ............ 19
EXTERIOR LAMPSÐAY-BODY ............ 22
GENERAL INFORMATION .................. 1
ILLUMINATED ENTRY SYSTEM ........... 33
GENERAL INFORMATION
Each vehicle is equipped with lamps used for illumi-
nating and indicating purposes. A circuit must have a
good ground to be complete. Circuit ground occurs
when the lamp socket makes contact with the metal
body. On vehicles with plastic lamps, a wire between
the socket and the body makes the grounds. When changing lamp bulbs, check the socket for
corrosion. If corrosion is present, clean contacts with a
wire brush and coat the inside of the socket with
Mopar tMulti-purpose Grease or equivalent.
CAUTION: Do not touch the glass of halogen bulbs
with fingers or any possibly oily surface, reduced
bulb life will result.
BODY IDENTIFICATION
Throughout this Group, references are made to the
vehicle family or body code. To decode the vehicle
identification plates, refer to the Introduction Section
at the front of this manual.
DIAGNOSTIC PROCEDURES
Begin electrical system failure diagnosis by testing
all related fuses and circuit breakers in the fuse block
and engine compartment. When a vehicle experiences problems with the head-
lamp system, verify the condition of the battery con-
nections, charging system, headlamp bulbs, wire con-
nectors, relay, high beam dimmer switch and headlamp
switch. Refer to Wiring Diagrams manual for compo-
nent locations and circuit information.
SYMPTOM
Headlamps are dim when engine is idling of
with ignition turned OFF. Canada cars must
have lamps ON. ACTION
² Clean battery terminal clamps and posts. Refer to
Group 8B, Battery/Starter/Generator Service for
proper procedures.
² Test charging system output. Refer to Group 8A,
Battery/Starting/Charging Systems Diagnostics for
proper testing procedures.
² Test for high resistance in headlamp circuits.
² Defective headlamp bulb.
SYMPTOM
Bulbs burn out frequently.
ACTION
² Test charging system output. Refer to Group 8A,
Battery/Starting/Charging Systems Diagnostics for
proper testing procedures.
² Check for loose or corroded connector terminals or
splices in headlamp circuits. Refer to Wiring Diagrams
manual for component and splice locations.
SYMPTOM
Headlamps are dim with engine running above
idle. Canada cars must have lamps ON.
ACTION
² Test charging system output. Refer to Group 8A,
Battery/Starting/Charging Systems Diagnostics for
proper testing procedures.
² Test for high resistance in headlamp circuits.
² Defective headlamp bulb.
SYMPTOM
Headlamps flash randomly.
ACTION
² Test for poor circuit ground.
² Test for high resistance in headlamp circuits.
Ä LAMPS 8L - 1