wiring CHEVROLET DYNASTY 1993 Service Manual

CONDITION: SPEEDOMETER AND ODOMETER ARE INOPERATIVE OR OPERATESINTERMITTENTLY
PROCEDURE
Check for defective vehicle speed sensor wiring.
CONDITION: OIL GAUGE, FUEL GAUGE, TEMPERATURE GAUGE, OR VOLTAGE GAUGEINOPERATIVE
PROCEDURE
Check for defective sending unit or wiring: (a) Sending units and wiring can be checked by
grounding the connector leads, at the sending unit,
in the vehicle. (b) With the ignition in the ON position, a
grounded input will cause the oil, fuel, or temper-
ature gauge to read maximum.
CONDITION: CLUSTER DISPLAY DOES NOT DIM WHEN HEADLAMP SWITCH ISACTIVATED AND RHEOSTAT ROTATED
PROCEDURE
(1) Check fuses in headlamp circuit.
(2) Check for loose connections or defective wiring
from headlamp switch to the cluster. (3) Check for defective headlamp switch.
(4) The electronic instrument cluster requires both
a marker feed and illumination feed to operate cor-
rectly.
SWITCH AND PANEL COMPONENT SERVICE
HEADLAMP/FOG LAMP SWITCH REPLACEMENT
(1) Remove cluster bezel (Fig. 40).
(2) Remove three screws securing headlamp switch
mounting plate to base panel (Fig. 41). (3) Pull headlamp/fog lamp switch mounting plate
rearward. Disconnect wiring connectors from head-
lamp switch and fog lamp switch pigtail (Fig. 42). (4) Remove knob and stem by depressing button on
bottom of the switch (Fig. 43). (5) Snap-out escutcheon.
(6) Remove fog lamp switch from escutcheon.
(7) Remove nut that attaches headlamp switch to
mounting plate (Fig. 44). (8) For installation reverse above procedures.
FOG LAMP SWITCH TEST
(1) Remove the fog lamp switch from mounting lo-
cation. (2) Disconnect the wiring harness from the switch
pigtail. (3) Using a Ohmmeter, test for continuity between
the terminals of the switch pigtail (Fig. 45). (4) If not OK, replace switch.
LOWER STEERING COLUMN COVERREPLACEMENT
(1) Disconnect park brake release rod from park
brake. (2) Remove fuse box access door and remove screw
from lower column cover (Fig. 46). (3) Remove screws from lower cover, four across
the top and two on bottom. (4) Remove lower steering column cover.
(5) For installation reverse above procedures.
LEFT LOWER INSTRUMENT PANEL SILENCER REPLACEMENT
(1) Remove screws from front of silencer (Fig. 47).
(2) Remove push nut.
(3) Remove silencer.
(4) For installation reverse above procedures.
RIGHT LOWER INSTRUMENT PANEL SILENCER REPLACEMENT
(1) On floor shift vehicles, remove console assem-
bly and center brace bracket. (2) On column shift vehicles, remove center brace
bracket. (3) Remove screws from front of silencer (Fig. 47).
(4) Remove three push nuts from rear of silencer.
(5) Remove lower right silencer.
(6) For installation reverse above procedures.
GLOVE BOX ASSEMBLY REPLACEMENT
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground. (2) Open glove box door and disconnect check
strap. (3) Remove glove box light and switch by squeez-
ing retaining tabs from behind switch mount and
slide rearward. Disconnect wiring connectors. (4) Remove 11 screws from glove box assembly
(Fig. 48). (5) Remove glove box assembly.
Fig. 36 Electronic Cluster
Ä INSTRUMENT PANEL AND GAUGES 8E - 15

(6) For installation reverse above procedures and
check operation of glove box door and adjust latch as
necessary.
GLOVE BOX LAMP AND SWITCH REPLACEMENT
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground. (2) Open glove box door. The lamp can be removed
without removing switch (3) Remove switch by squeezing retaining tabs
from behind switch mount and slide rearward. Dis-
connect wiring connectors. (4) Remove lamp and switch.
(5) For installation reverse above procedures.FOG LAMP RELAY REPLACEMENT
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground.
ART: 938e-92 ; SIZE (6) = 4-1/2h x 7-1/4w
Fig. 39 Cluster Connectors
Fig. 40 Cluster BezelFig. 41 Headlamp Switch Mounting Screws
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(2) Remove glove box assembly (Fig. 49). Refer to
Glove Box Assembly Replacement. (3) Remove screw from relay.
(4) Disconnect wiring.
(5) Remove relay. (6) For installation reverse above procedures.
REAR WINDOW DEFOGGER SWITCH
REPLACEMENT
(1) Remove left bezel by pulling straight back.
(2) Press tabs and pull switch rearward.
(3) Disconnect wiring and remove switch.
(4) For installation reverse above procedures.
INSTRUMENT PANEL CENTER BEZELREPLACEMENT
(1) Pull bezel straight back disengaging five clips.
(2) Disconnect ash receiver lamp and wiring from
bezel. (3) For installation reverse above procedures.
ASH RECEIVER/CUP HOLDER REPLACEMENT
(1) Remove center bezel. Disconnect ash receiver
lamp socket. (2) Remove four screws from center module and re-
move module.
Fig. 42 Headlamp Switch Wiring Connectors
Fig. 43 Headlamp Switch Knob and Stem
Fig. 44 Headlamp Switch Mounting Nut
Fig. 45 Fog Lamp Switch Test
Fig. 46 Lower Steering Column Cover
Ä INSTRUMENT PANEL AND GAUGES 8E - 19

(3) Remove four screws from ash receiver/cup
holder housing. (4) For installation reverse above procedures.
AIR CONDITIONING CONTROLREPLACEMENT
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground. (2) Remove center bezel. Disconnect ash receiver
lamp socket. (3) Remove glove box assembly. Refer to Glove Box
Assembly Replacement. (4) Reach through glove box opening and discon-
nect vacuum lines. (5) Remove two control mounting screws (Fig. 50).
(6) Slide control rearward, disconnect cable, and
electrical wiring. (7) Remove unit.
(8) For installation reverse above procedures.
CIGAR LIGHTER ASSEMBLY REPLACEMENT
(1) Remove center bezel. Disconnect ash receiver
lamp socket. (2) Remove two screws from bezel of the lighter as-
sembly. (3) Pull assembly rearward and disconnect wiring.
(4) For installation reverse above procedures.
TRAVELER/MESSAGE CENTER REPLACEMENT
(1) Remove cluster bezel.
(2) Remove four mounting screws.
(3) Pull unit rearward and disconnect wiring.
(4) For installation reverse above procedures.
INSTRUMENT PANEL
INSTRUMENT PANEL TOP COVER REPLACEMENT
(1) Lift up rearward edge of instrument panel top
cover. (2) Pull panel rearward to remove.
(3) To install: position top cover and snap into
place, pull rearward for proper fit.
INSTRUMENT PANEL REPLACEMENT
CAUTION: Disconnect negative battery cable, in en-
gine compartment, before servicing instrument
panel.
(1) Disconnect battery negative cable and isolate
or remove fuse #2 prior to removing switch or wires
may short to ground. (2) Remove left and right A-pillar trim.
(3) Remove left and right cowl side trim.
(4) Remove glove box assembly. Refer to Glove Box
Assembly Replacement. (5) Remove four relays above glove box assembly.
(6) Reach through glove box opening and discon-
nect A/C control vacuum lines, radio noise suppressor
wires, and blower motor/cycling switch wires. (7) Remove hood release handle.
(8) Remove lower steering column cover.
(9) Remove lower left instrument panel silencer
and reinforcement. (10) Remove instrument panel center bezel.
(11) Remove floor console. Refer to Group 23,
Body. (12) Remove radio, A/C control, cigar lighter, and
message center/traveler. (13) Disconnect demister hoses.
(14) Remove instrument panel top cover (Fig. 51).
(15) Disconnect battery to assure no air bag sys-
tem fault codes are stored. (16) Remove cluster refer to Cluster Assembly.
(17) Remove radio and rear window defogger be-
zels. (18) Lower steering column.
(19) Loosen instrument panel pivot bolts.
(20) Remove screws which attach instrument panel
to windshield fence line. (21) Allow panel to roll down slightly and discon-
nect remaining electrical connections. (22) With the aid of a helper remove panel pivot
bolts and remove panel from vehicle. (23) For installation reverse above procedures.
INTERIOR LAMP REPLACEMENT
The dome, overhead console and door lamps, if
equipped operate when the doors are open or head-
lamp switch is placed in courtesy position. The front
header reading lamp operates only when the lamp
push buttons are ON.
DOME LAMP
Pry either the forward or rearward edge of the lens
away from the bezel and replace lamp.
FRONT HEADER READING LAMP
Pull lamp from headliner. Disconnect wiring and
replace lamp.
Fig. 50 A/C Control
Ä INSTRUMENT PANEL AND GAUGES 8E - 21

DOOR LAMPS
Pry along top edge of lens and pivot lens out of
lamp. Replace lamp. To remove lamp remove door
trim panel and disconnect all wiring. Flex the tabs of
the lamp retaining bracket and remove lamp.
DOOR KEY CYLINDER LED LAMP
(1) Remove door trim panel. Refer to Group 23,
Body. (2) Assure window is in full up position.
(3) Disconnect LED lamp wiring pig tail and note
wire routing for installation. Use care when remov-
ing lamp so not to disengage lamp retaining clip
from key cylinder (Fig. 52). (4) For installation reverse above procedures.
TRUNK LAMP
The lamp is easily accessible without removing any
components.
Fig. 51 Instrument Panel
Fig. 52 Door Key Cylinder LED Lamp
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MESSAGE CENTER
The message center is a car graphic warning lamp
module. This conventional warning system and lo-
cated above the headlamp switch.
ELECTRONIC DIGITAL CLOCK
The electronic digital clock is in the radio. The
clock and radio each use the display panel built into
the radio. A digital readout indicates the time in
hours and minutes whenever the ignition switch is in
the ON or ACC position. When the ignition switch is in the OFF position, or
when the radio frequency is being displayed, time
keeping is accurately maintained. The procedure for setting the clock varies slightly
with each radio. The correct procedure is described
under the individual radio operating instructions re-
ferred to in the Owner's Manual supplied with the
vehicle.
AIR BAG WARNING SYSTEM
For testing of this system refer to Group 8M, Re-
straint Systems.
MECHANICAL CLUSTER AND GAUGE SERVICE
CAUTION: Disconnect negative battery cable, in en-
gine compartment, before servicing instrument
panel. When power is required for test purposes,
reconnect battery cable for the test only.
Disconnect negative battery cable after test and be-
fore continuing service procedures.
SENDING UNIT TEST
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.
CHECK GAUGES WARNING LAMP TESTS
The check gauges warning lamp is illuminated by
the low oil pressure sending unit switch or the body
controller when there is high temperature or charg-
ing system failure. To test the lamp, turn ignition key to the ON po-
sition without starting the vehicle. The low oil pres-
sure switch is grounded and the light will be on
indefinitely. If the lamp fails to light, pull the cluster and check
the following: (a) Continuity between ground and check gauge
pin J (Fig. 3). (b) Proper contact between the gauge pins and
wiring harness and printed circuit board pins. (c) If there is ground and proper pin contact, re-
place lamp. (d) If there is no continuity, check the low oil
pressure sending unit switch (Fig. 4 and 5).
To test the switch disconnect the switch electrical
connector. Attach positive lead of an ohmmeter to
the switch terminal for the gray (GY) wire and the
negative lead to an engine ground. With the engine
Fig. 3 Mechanical Cluster Connectors
8E - 24 INSTRUMENT PANEL AND GAUGES Ä

(3) Remove lower steering column cover (Fig. 10
through 14).
(4) Place gear shift lever in neutral or park.
(5) Remove guide tube from behind fuse block and
disconnect cable eyelet from column actuating arm. (6) Release lock bar on column insert, squeeze legs
together and remove from column (Fig. 13). (7) Secure insert and cable guide out of the way.
(8) Remove the rear window defogger bezel and ra-
dio bezel. (9) Remove the upper steering column cover.
(10) Remove the four screws attaching cluster
housing to the base panel (Fig. 15). (11) Pull cluster rearward, reach behind cluster
and disconnect the two wiring harnesses. (12) Remove cluster assembly. INSTALLATION
(1) Connect wiring harnesses.
(2) Install cluster assembly while routing trans-
mission range indicator guide tube through access
hole in base panel (Fig. 10 through 14). Release
guide tube from behind fuse block. (3) Insert flange of column insert into column,
squeeze legs together with tabs under column jacket
and engage lock bar to secure insert (Fig. 13). (4) Hook cable eyelet to steering column actuator
check pointer, should indicate neutral. Do not kink
Fig. 10 Transmission Range Indicator
Fig. 11 Transmission Range Indicator Step 1
Fig. 12 Transmission Range Indicator Step 2
Fig. 13 Transmission Range Indicator Step 3
Ä INSTRUMENT PANEL AND GAUGES 8E - 27

or bind the transmission range indicator guide tube
and position guide tube in original location.(5) Adjust with tool if necessary to center pointer
on N (Neutral) and check in other gears (Fig. 14). (6) Install upper and lower steering column cover.
(7) Install the rear window defogger bezel and ra-
dio bezel. (8) Install cluster bezel.
(9) Reconnect battery.
REMOVALÐCLUSTER WITHOUT TRANSMISSION RANGE
INDICATOR FROM STEERING COLUMN
(1) Remove cluster bezel (Fig. 10).
(2) Remove four screws attaching cluster to base
panel. (3) Pull cluster rearward carefully, reach behind
and disconnect the two harness connectors. (4) Carefully rotate cluster and remove the two
transmission range indicator screws. (5) Remove cluster assembly.
(6) For installation reverse above procedures. (a) Do not kink guide tube when installing clus-
ter. (b) Replace guide tube behind fuse block.
GAUGES
It is not necessary to remove instrument cluster
from vehicle for gauge replacement. When removing
gauge assemblies from cluster, gauge must be pulled
straight out, not twisted, or damage to gauge pins
may result.
MULTIPLE GAUGE MALFUNCTION
If all the instrument cluster gauges appear to be
malfunctioning, remove the cluster assembly.
² Check for good pin contact
² Check for ignition voltage between the IGN cavity
D and ground.
² If there is ignition voltage
² Check for continuity between the wire harness
ground cavity G and ground.
² If there is continuity, replace the print circuit
board (Fig. 16).
GAUGE INOPERATIVE (FIG. 17 THROUGH 20)
(1) Remove gauge in question.
(2) With the ignition key ON, check for ignition
voltage at ignition pin of gauge. Check for ground at
ground pin of gauge. Refer to the individual gauge
circuit test for proper pin. (a) If no voltage or ground at gauge pins. Check
cavity D red cluster connector for ignition voltage
or cavity G for ground. (b) If no voltage or ground, repair as necessary.
Refer to 8W, Wiring Diagrams.
Fig. 15 Cluster With Mask and Lens Removed
Fig. 14 Transmission Range Indicator Step 4
8E - 28 INSTRUMENT PANEL AND GAUGES Ä

(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

ELECTRONIC CLUSTER
SELF DIAGNOSTIC SYSTEM
The electronic clusters have an internal diagnostics
routing to isolate problems within the cluster or CCD
Bus. Using the cluster Self-Diagnostic Test will deter-
mine whether the problem is within the cluster or
outside of cluster (Fig. 29 and 30). Successful completion of the Self Diagnostic Test
indicates that the problem is in the CCD Bus, inter-
facing modules, connectors, or sensors outside of the
cluster. Refer to Fig. 31 for terminal listing.
CONDITION: CLUSTER DISPLAYS DO NOT ILLUMINATE AFTER VEHICLE IS STARTED
PROCEDURE
(1) Check fuses and verify battery and ignition
voltage at cluster connector. (2) Check ground from cluster connector to instru-
ment panel ground stud.
CONDITION: CLUSTER ASTERISK (*) FLASHES, CLUSTER DISPLAYS NOTINDICATING CORRECT DATA.
PROCEDURE
CCD bus problem. Use the Body Chassis Diagnos-
tic Manual to diagnose CCD Bus.
CONDITION: SPEEDOMETER AND ODOMETER ARE INOPERATIVE OR OPERATESINTERMITTENTLY
PROCEDURE
(1) If speedometer reads 0, or odometer is blank,
and cluster asterisk is flashing, use the Body Chassis
Diagnostic Manual to diagnose CCD Bus problem. (2) If cluster asterisk is not flashing, check for de-
fective vehicle speed sensor or speed sensor wiring.
CONDITION: OIL GAUGE, FUEL GAUGE, TEMPERATURE GAUGE, OR VOLTAGE GAUGEINOPERATIVE
PROCEDURE
If any gauge gives no indication and cluster aster-
isk is flashing, use the Body Chassis Manual to diag-
nose CCD Bus problem. If cluster asterisk is not flashing:
(1) Check for defective sending unit or wiring. (a) Sending units and wiring can be checked by
grounding the connector leads, at the sending unit,
in the vehicle. (b) With the ignition in the ON position, a
grounded input will cause the oil, fuel, or temper-
ature gauge to read maximum. (2) If the problem is with the oil, temperature, or
fuel gauge, check the body controller. If the problem
is with the voltage gauge, check the powertrain con-
trol module operation.
CONDITION: CLUSTER DISPLAY DOES NOT DIM WHEN HEADLAMP SWITCH ISACTIVATED AND RHEOSTAT ROTATED
PROCEDURE
If the cluster asterisk is flashing, Refer to the Body
Chassis Diagnostic Manual to diagnose the CCD Bus. If the cluster asterisk is not flashing:
(1) Check fuses in headlamp circuit.
(2) Check for loose connections or defective wiring
for headlamp switch to body controller. (3) Check for defective headlamp switch. The elec-
tronic instrument cluster receives the display inten-
sity status from the body controller via the CCD Bus.
CONDITION: SEAT BELT WARNING LAMP DOES NOT ILLUMINATE
PROCEDURE
Turn on ignition. Lamp should illuminate for six
seconds. If not: (1) Check for burned out lamp and retest.
(2) Replace cluster.
CONDITION: LOW WASHER, DOOR/DECK, OR MALFUNCTION INDICATOR (CHECK ENGINE)LAMP, DO NOT ILLUMINATE
PROCEDURE
(1) Perform cluster self-diagnostics to determine if
lamp will illuminate. If lamp does not, check for
burned out lamp, replace and retest. (2) If cluster asterisk is flashing, Refer to the Body
Chassis Diagnostic Manual to diagnose CCD Bus. (3) If cluster asterisk is not flashing:(a) For low washer fluid or door/deck, check in-
puts to body controller. (b) For malfunction indicator (check engine),
check powertrain control module operation.
CONDITION: ODOMETER DISPLAY IS BLANK. THE ODOMETER VALUE IS NO LONGERRETAINED IN THIS ELECTRONIC CLUSTER.THIS TAKES PLACE IN THE BODYCONTROLLER
PROCEDURE
(1) If cluster asterisk is flashing, Refer to the Body
Chassis Diagnostic Manual to diagnose CCD Bus. (2) If cluster asterisk is not flashing, perform clus-
ter self-diagnostics. If code 921 appears in the odom-
eter display, replace body controller for odometer
failure.
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