1993 CHEVROLET DYNASTY ESP

(3) When testing temperature, allow the engine to
run until the vehicle reaches a normal operating
temperature. Turn ignition OFF, and remove gauge
from cluster. (a) Testing oil pressure gauge, engine needs to
be running. (b) Measure and record the resistance between
sending unit pin and ground pin of the gauge in
question. Refer to Gauge Calibration. (c) It is important to have the same engine tem-
perature and engine speed when checking temper-
ature and oil pressure gauges position. The time
between gauge position reading and sending unit
measuring should be kept to a minimum. (d) If resistance and gauge position are not sim-
ilar, replace gauge. (e) If OK, test resistance from the sending unit
to the cluster connector. (f) If resistance reading is different, check
printed circuit board for contact to cluster connec-
tor. (g) If OK and contacts are not distorted, replace
printed circuit board. (h) If everything checks out OK, refer to sending
unit test.
(4) If fuel gauge does not meet specifications, refer
to Group 14, Fuel for the test procedure.
GAUGE CALIBRATION
(1) Remove the gauge.
(2) Check for ignition voltage and ground to the
gauge. (3) With the ignition key in the OFF position, re-
place gauge. Turn the ignition key to the ON posi-
tion. To test oil pressure gauge engine must be
running. When testing oil or temperature gauge the
engine should be at normal operating temperature.
Record the gauge position. (4) Remove gauge and record the resistance be-
tween the sending unit pin and the gauge ground
pin. When checking gauges, it is important to have
the same engine temperature and speed when noting
gauge position. The time between gauge reading and
measuring should be kept to a minimum. (5) The Gauge Resistance Chart (Fig. 24), is gen-
eral guidelines for checking the gauge position
against the sending unit resistance. Because of only a few specific points of gauge posi-
tion versus sending unit resistance, a good estimate
is need when the resistance falls between gradua-
tions. Even when the resistance corresponds to grad-
uations, the gauge has a tolerance of 64 ohms.
Volt gauge: The calibration dot on the volt gauge
corresponds to 13 volts between the gauge ignition
and ground pins. If voltage varies from this, estimate
proper gauge position with input voltage.
TACHOMETER REPLACEMENT
(1) Remove cluster, radio and rear window defog-
ger bezels and mask/lens assembly. (2) Remove screws attaching tachometer to cluster
housing. (3) Pull tachometer rearward to remove.
(4) For installation reverse above procedures.
TACHOMETER CIRCUIT TESTING
(1) Remove cluster, radio and rear window defog-
ger bezels and mask/lens assembly. (2) Check for battery voltage at cavity A of the in-
strument cluster black connector. (3) With the ignition in the ON position, check for
battery voltage at cavity C of the black connector
(Fig. 25).
Fig. 24 Gauge Resistance
Fig. 25 Printed Circuit Board 11-Way Connector
Ä INSTRUMENT PANEL AND GAUGES 8E - 9

(b) Refer to sending unit removal Group 14, Fuel.
(c) Connect sending unit wire and jumper wire
as described in the test procedure.
(5) If fuel gauge now checks within specifications,
original sending unit is electrically okay, check fol-
lowing as a possible cause: (a) Ground wire from sending unit to left side
cowl for continuity. (b) Sending unit deformed. Make sure sending
unit float arm moves freely and pick up tube is not
bent upwards creating an interference with bottom
of tank and inspect float. (c) Sending unit improperly installed. Install
properly. (d) Mounting flange on fuel tank for sending
unit deformed. Feel for interference fit of sending
unit to bottom of tank. It is permissible to bend
pick up tube down a little near mounting flange to
gain interference fit. (e) Fuel tank bottom deformed, causing improper
positioning of sending unit pick up tube. Replace or
repair tank and recheck sending unit.
GAUGE CALIBRATION
(1) Remove the gauge.
(2) Check for ignition voltage and ground to the
gauge. (3) With the ignition key in the OFF position, re-
place gauge. Turn the ignition key to the ON posi-
tion. To test oil pressure gauge engine must be
running. When testing oil or temperature gauge the
engine should be at normal operating temperature.
Record the gauge position. (4) Remove gauge and record the resistance be-
tween the sending unit pin and the gauge ground
pin. When checking gauges, it is important to have
the same engine temperature and speed when noting
gauge position. The time between gauge reading and
measuring should be kept to a minimum. (5) The resistance Chart (Fig. 21), is general
guidelines for checking the gauge position against
the sending unit resistance. Because of only a few specific points of gauge posi-
tion versus sending unit resistance, a good estimate
is need when the resistance falls between gradua-
tions. Even when the resistance corresponds to grad-
uations, the gauge has a tolerance of 64 ohms.
Volt gauge: The calibration dot on the volt gauge
corresponds to 13 volts between the gauge ignition
and ground pins. If voltage varies from this, estimate
proper gauge position with input voltage.
VOLTMETER REPLACEMENT
(1) Remove cluster bezels and mask (Fig. 22).
(2) Remove screws attaching gauge assembly to
cluster. (3) Pull rearward to disengage gauge from gauge
pins. (4) For installation reverse above procedures.
OIL PRESSURE GAUGE REPLACEMENT
(1) Remove cluster bezels and mask/lens (Fig. 22).
(2) Remove screws attaching gauge assembly to
cluster.
(3) Pull rearward to disengaged gauge from gauge
pins.
(4) For installation reverse above procedures.
FUEL AND TEMPERATURE GAUGE ASSEMBLY REPLACEMENT
(1) Remove cluster bezel and mask/lens (Fig. 22).
(2) Remove oil pressure gauge.
(3) Remove screws attaching gauge assembly to
cluster.
(4) Pull rearward to disengage gauge from gauge
pins.
(5) For installation reverse above procedures.
SPEEDOMETER SYSTEM
AC body vehicles are equipped with electronically
driven speedometer and odometer assemblies. The unit
has the same appearance as a conventional speedometer
but it eliminates the cable-driven mechanical system. A
signal is sent from a transmission-mounted vehicle
speed sensor to the speedometer circuitry through the
wiring harness. By eliminating the speedometer cable,
instrument cluster service and removal is improved. Re-
fer to Fig. 23 Speedometer Diagnosis Chart. When the speedometer is out of calibration. The elec-
tronic automatic transaxle vehicle speed sensor output
must be calibrated to reflect the different combinations
of equipment. The procedure is called Pinion Factor, re-
fer to Group 21, Transaxle for the procedure.
Fig. 21 Gauge Resistance
8E - 30 INSTRUMENT PANEL AND GAUGES Ä

(f) If there is a difference in readings, check
printed circuit board for contact to cluster connec-
tors. (g) If OK and contacts are not distorted, replace
printed circuit board. (h) If everything checks out OK, refer to Sending
Unit Test.
(4) The Gauge Resistance Chart (Fig. 12), is gen-
eral guidelines for checking the gauge position
against the sending unit resistance. Because of only
a few specific points of gauge position versus sending
unit resistance, a good estimate is needed when the
resistance falls between graduations. Even when the
resistance corresponds to graduations, the gauge has
a tolerance of 64 ohms.
Volt gauge: The calibration dot on the volt gauge
corresponds to 13 volts between the gauge ignition
and ground pins. If voltage varies from this, estimate
proper gauge position with input voltage.
TACHOMETER AND TURBO GAUGE REMOVAL
(1) Remove switch pod assembly.
(2) Remove steering column trim cover.
(3) Remove cluster mask and lens assembly.
(4) Remove screws attaching tachometer to cluster
housing. (5) Pull tachometer rearward to remove.
(6) Disconnect turbo gauge hose. If turbo hose can-
not be disconnected, remove cluster. (7) For installation reverse above procedures.
TACHOMETER CIRCUIT TESTING
(1) Remove cluster. (2) Check for battery voltage at cavity 8 of the in-
strument cluster red connector (Fig.6). (3) With the ignition in the ON position, check for
battery voltage at cavity 9 of the instrument cluster
red connector. (4) Check cavity 14 of the instrument cluster red
connector for continuity to ground. (5) Check for tachometer signal from the power-
train control module by connecting an AC DIGITAL
VOLTMETER to cavity 6 of the instrument cluster
black connector and ground. A reading of at least 1.0
volt should be present with the engine running (Fig.
7). (a) If voltage is within specification, go to step 7.
(b) If voltage is NOT within specification, per-
form steps 6.
(6) If there is less than 1.0 volt at cavity 6, check
for continuity between cavity 6 and pin 43 of the
powertrain control module connector. (a) If continuity is OK, between cavity 6 and pin
43 of the powertrain control module connector, re-
place the powertrain control module. (b) No continuity check the connectors for dam-
aged pins or terminal push outs or defective wire.
(7) If all tests performed test good replace the ta-
chometer drive module. (8) If the tachometer continues to be inoperative,
replace the tachometer assembly.
VOLTMETER, TEMPERATURE GAUGE, OIL PRESSURE GAUGE AND FUEL GAUGEASSEMBLYÐREMOVAL
(1) Remove pod switch assembly.
(2) Remove steering column trim cover.
(3) Remove cluster mask and lens assembly.
(4) Remove screws attaching gauge assembly to
cluster. (5) Pull rearward to remove gauge assembly.
(6) For installation reverse above procedures.
SENDING UNIT TEST
It is not necessary to remove instrument clus-
ter from vehicle for gauge replacement. When removing gauge assemblies from cluster,
gauge must be pulled straight out, not twisted, or
damage to gauge pin may result. When a problem occurs with a cluster gauge, be-
fore disassembling the cluster to check the gauge,
check for a defective sending unit or wiring. (1) Sending units and wiring can be checked by
grounding the connector leads, at the sending unit,
in the vehicle. (2) With the ignition in the ON position; a
grounded input will cause the oil, fuel or tempera-
ture gauge to read at or above maximum.
Fig. 12 Gauge Resistance
8E - 46 INSTRUMENT PANEL AND GAUGES Ä

(f) If everything checks out OK, refer to Sending
Unit Test.
(4) With the ignition switch in the ON position,
check for battery voltage across the ignition pin and
the ground pin. (5) If fuel gauge meets specifications check fuel
tank and original fuel tank sending unit as follows: (a) Carefully remove fuel tank sending unit from
tank. (b) Refer to sending unit removal Group 14,
Fuel. (c) Connect sending unit wire and jumper wire
as described in the test procedure.
(6) If fuel gauge now checks within specifications,
original sending unit is electrically okay, check fol-
lowing as a possible cause: (a) Ground wire from sending unit to left side
cowl for continuity. (b) Sending unit deformed. Make sure sending
unit float arm moves freely and pick up tube is not
bent upwards creating an interference with bottom
of tank and inspect float. (c) Sending unit improperly installed. Install
properly. (d) Mounting flange on fuel tank for sending
unit deformed. Feel for interference fit of sending
unit to bottom of tank. It is permissible to bend
pick up tube down a little near mounting flange to
gain interference fit. (e) Fuel tank bottom deformed, causing improper
positioning of sending unit pick up tube. Replace or
repair tank and recheck sending unit.GAUGE CALIBRATION
(1) Remove the gauge.
(2) Check for ignition voltage and ground to the
gauge. (3) With the ignition key in the OFF position, re-
place gauge. Turn the ignition key to the ON posi-
tion. To test oil pressure gauge engine must be
running. When testing oil or temperature gauge the
engine should be at normal operating temperature.
Record the gauge position. (4) Remove gauge and record the resistance be-
tween the sending unit pin and the gauge ground
pin. When checking gauges, it is important to have
the same engine temperature and speed when noting
gauge position. The time between gauge reading and
measuring should be kept to a minimum. (5) Resistance Chart (Fig. 11), is general guide-
lines for checking the gauge position against the
sending unit resistance. Because of only a few specific points of gauge posi-
tion versus sending unit resistance, a good estimate
is needed when the resistance falls between gradua-
tions. Even when the resistance corresponds to grad-
uations, the gauge has a tolerance of 64 ohms.
Volt gauge: The calibration dot on the volt gauge
corresponds to 13 volts between the gauge ignition
and ground pins. If voltage varies from this, estimate
proper gauge position with input voltage.
FUEL GAUGE REPLACEMENT
(1) Remove instrument cluster bezel.
(2) Remove mask and lens.
(3) If equipped with tachometer, remove three re-
taining screws and pull the tach straight back.
Fig. 10 Instrument Cluster Without Tachometer
Ä INSTRUMENT PANEL AND GAUGES 8E - 63

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

HORNS
CONTENTS
page page
GENERAL INFORMATION .................. 1
HORN SWITCH REPLACEMENT ............ 3 TESTING HORN SYSTEM
................. 1
GENERAL INFORMATION
WARNING: ON VEHICLES EQUIPPED WITH AIR
BAG, SEE GROUP 8M, RESTRAINT SYSTEMS FOR
STEERING WHEEL OR COLUMN REMOVAL PROCE-
DURES.
The horn circuit consists of a horn switch, horn re-
lay, and horns. The horn circuit feed is from the fuse
box to the number 1 terminal on the horn relay.
When the horn switch is depressed, this completes
the circuit to ground. This activates the horn relay
and an set of contacts in the relay to close, which al-
lows current to flow to the horn(s). The horn ground
wire is attached to the headlamp ground screw (Fig.
1).
TESTING HORN SYSTEM
HORNS WILL NOT SOUND
If the horns do not sound, check for a blown horn
fuse in the fuse block. If the fuse is blown, replace it
with the same fuse type. If the horns fail to sound
and the new fuse blows when depressing the horn
switch, a short circuit in the horn or the horn wiring
between the fuse terminal and the horn is responsi-
ble. If the fuse is good, disconnect wire connector at
horn. Using an test lamp, connect one lead to the
negative terminal and the other to the positive ter-
minal (Fig. 2). Depress the horn switch, the test
lamp should illuminate. If not connect the test lamp wire to a good ground and depress the horn switch. If
test lamp lights inspect ground wire circuit and re-
pair as needed.
If the test lamp fails to illuminate, check for a de-
fective horn relay. Substituting a known good horn
relay in the circuit. If the test lamp illuminates
when depressing the horn switch, the original relay
is defective. If the test lamp fails to illuminate with
a known good relay, unplug that relay. Connect a
jumper wire from the battery terminal to the horn
terminal on the relay terminal board (Fig. 3, 4, or 5).
If the test lamp connected in place of the horns, fails
to illuminate an open circuit in the wiring between
the relay terminal and the horn switch is at fault re-
pair as necessary.
HORNS SOUND CONTINUOUSLY
CAUTION: Continuous sounding of horns may
cause relay to fail.
Should the horns sound continuously, unplug the
horn relay from the terminal board inside the pas-
senger compartment. Plug in a known good relay. If
the horns stop blowing, relay is defective and must
be replaced. Should the horns still sound, proceed as
follows: Connect one voltmeter lead to battery termi-
nal on relay board and the other lead to switch ter-
minal. Refer to Figs. 6, 7, or 8. Voltmeter will
Fig. 1 Conventional Horn System
Fig. 2 Horn and Connector
Ä HORNS 8G - 1

TO RESUME: After disengaging the vehicle speed
control by tapping the brake pedal or clutch pedal,
push the RESUME/ACCEL button to return vehicle
to the previously set speed. TO ACCELERATE: While vehicle speed control is
engaged, hold the RESUME/ACCEL button de-
pressed and release at a new desired speed. This will
allow the vehicle to continuously accelerate and set
at a higher speed setting. TAP-UP:
When the vehicle speed control is en-
gaged, tapping the RESUME/ACCEL button will in-
crease the speed setting by 2 mph (3 km/h). The
system will respond to multiple tap-ups. TO ACCELERATE for PASSING: Depress the
accelerator as you would normally. When the pedal
is released the vehicle will return to the speed set-
ting in memory.
DIAGNOSIS PROCEDURES
Whenever a vehicle speed control malfunction oc-
curs, first verify that the vehicle speed control wire
harness is properly connected to all connectors before
starting normal diagnosis and repair procedures. Re-
fer to Electronic Vehicle Speed Control Diagnosis
Chart or Vehicle Speed Control Circuit (Fig. 9, 10
and 11). A poor connection can cause a complete or inter-
mittent malfunction and is also the only connection
in the circuit, that can not be tested. For this reason,
a loose connection may be misdiagnosed as a compo-
nent malfunction. Also, check all vacuum connections for tightness
and cracked hoses.
ROAD TEST
Road test vehicle to verify reports of vehicle speed
control malfunction. The road test should include at-
tention to the speedometer. Speedometer operation
should be smooth and without flutter at all speeds. Flutter in the speedometer indicates a problem
which might cause surging in the vehicle speed con-
trol. The cause of any speedometer deficiencies
should be corrected before proceeding.
Fig. 3 Vehicle Speed ControlÐTurbo
Fig. 4 Vehicle Speed ControlÐ3.0L
Fig. 5 Vehicle Speed ControlÐ2.2L Turbo III
8H - 2 VEHICLE SPEED CONTROL Ä

POWER LOCKS
CONTENTS
page page
CIRCUIT BREAKER TEST .................. 1
DECK LID OPERATION ................... 3
DECK LID PULL-DOWN SYSTEMÐAC and AY BODIES .............................. 3
DOOR LOCK INHIBIT ..................... 6
DOOR LOCK INHIBIT ..................... 1
DOOR LOCK MOTOR REPLACEMENT ........ 3
DOOR LOCK SYSTEM TEST ............... 3
ELECTRIC MOTOR TEST .................. 2 GENERAL INFORMATION
.................. 1
KEYLESS ENTRY SYSTEM ................ 1
LAMP OUTAGE MODULE REPLACEMENT .... 6
POWER DOOR LOCKS .................... 2
POWER PULL DOWN .................... 4
REMOTE KEYLESS ENTRY ................ 5
REMOTE KEYLESS MODULE REPLACEMENT . . 6
SWITCH TEST .......................... 1
WIRING VOLTAGE TEST .................. 1
GENERAL INFORMATION
All doors can be locked or unlocked electrically by
operating the switch on a front door panel or arm
rest. The rear doors can be locked or unlocked by actu-
ation of the front door switch, or can be locked or un-
locked mechanically and independently with their
respective locking knobs. The front doors can be locked or unlocked mechan-
ically with the locking knob regardless of electrical
locking and unlocking actuation with the front door
knobs. The right and left front door on all car lines can be
locked or unlocked mechanically from the outside
with the key or electrically as described above. The
left front can also be unlocked by actuation of the in-
side remote door handle. The right front door on AC,
AG, AJ and AY can be unlocked by actuation of the
inside remote door handle. The deck lid lock consists of a latch with internal
solenoid and push button switch. The solenoid is en-
ergized only when the push button is depressed.
DOOR LOCK INHIBIT
The power door lock inhibit system prevents the
doors from being locked using the power door locks
when either of two conditions occur: (1) The key is in the ignition switch and any of the
doors are open. The ignition switch does not have to
be ON. (2) The key is in the ignition switch and the head-
lamp are on.
KEYLESS ENTRY SYSTEM
The system allows locking and unlocking of vehicle
door(s) and Trunk lid by remote control using a hand
held radio transmitter. The ignition switch must be
OFF before the trunk lid can be unlocked with the
transmitter. The receiver may receive signals from two trans-
mitters. Each transmitter has its own code, and the
code has been stored in memory. If the transmitter is
replaced or a second transmitter is add, the code on
both units have to be placed in memory.
CIRCUIT BREAKER TEST
Find correct circuit breaker on fuse block. Pull out
slightly but be sure that circuit breaker terminals
still contact terminals in fuse block. Connect ground
wire of voltmeter to a good ground. With probe of
voltmeter positive wire, check both terminals of cir-
cuit breaker for 12 volts. If only one terminal checks
at 12 volts, circuit breaker is defective and must be
replaced. If neither terminal shows 12 volts, check
for open or shorted circuit to circuit breaker.
WIRING VOLTAGE TEST
The following wiring test sequence determines
whether or not voltage is continuous through the
body harness to switch. (1) Remove left side switch from trim panel.
(2) Carefully separate multiple terminal block on
wiring harness from switch body. (3) Connect one lead of test light to a ground ter-
minal:
² Black Wire AA and AC Bodies
² Gray wire AG and AJ Bodies
² Touch other test light lead to Red Wire terminal.
² If test light comes on, the wiring circuit between
the battery and switch is functional.
² If test light does not come on, check 30 amp circuit
breaker or for a open circuit.
SWITCH TEST
Remove the switch from its mounting location. Us-
ing an ohmmeter, refer to (Fig. 1) to determine if
continuity is correct in the Lock and Unlock switch
positions. If these results are not obtained, replace
the switch.
Ä POWER LOCKS 8P - 1