jump cable CHEVROLET DYNASTY 1993 User Guide

STARTER CONTROL CIRCUIT TESTS
The starter control circuit has:
² Starter solenoid
² Starter relay (Fig. 2)
² Neutral starting and back-up switch with auto-
matic transmissions
² Clutch pedal mounted starter interlock switch
with manual transmissions
² Ignition switch
² Battery
² All related wiring and connections
CAUTION: Before performing any starter tests, the
ignition system must be disabled.
² VEHICLES EQUIPPED WITH A CONVEN-
TIONAL DISTRIBUTOR: Disconnect coil wire from
distributor cap center tower. Secure wire to a good
ground to prevent engine from starting (Fig. 6).
² VEHICLES EQUIPPED WITH DIRECT IGNI-
TION SYSTEM: Unplug the coils electrical connector
(Fig. 7).
STARTER SOLENOID TEST
WARNING: CHECK TO ENSURE THAT THE TRANS-
MISSION IS IN PARK OR NEUTRAL WITH THE
PARKING BRAKE APPLIED
(1) Verify battery condition. Battery must be in
good condition with a full charge before performing
any starter tests. Refer to Battery Tests. (2) Perform this starter solenoid test BEFORE per-
forming the starter relay test. (3) Raise the vehicle.
(4) Perform a visual inspection of the starter/
starter solenoid for corrosion, loose connections or
faulty wiring. (5) Lower the vehicle.
(6) Locate the starter relay as follows:
² On AC, AG, AJ and AY Bodies the relay is located
in the Power Distribution Center. This Center is mounted near the front of the left front strut tower
(Fig. 13). The position of the starter relay within this
Center will be shown on the Center cover.
² On AA/AP Bodies the relay is located on the front
of the left front strut tower (Fig. 14).
(7) Remove the starter relay from the connector.
(8) Connect a remote starter switch or a jumper
wire between the battery positive post and terminal
87 on the starter relay connector. To decide the
starter relay terminal numbers, refer to the Starter
Relay Tests.
² If engine now cranks, starter/starter solenoid is
good. Go to the starter relay test.
² If engine does not crank with this test, or solenoid
chatters, check wiring and connectors from starter
Fig. 12 Test Positive Battery Cable Resistance
Fig. 13 Starter Relay LocationÐAC, AG, AJ, and AY Bodies
Fig. 14 Starter Relay LocationÐAA/AP Body
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 15

GENERATOR TEST PROCEDURES ON VEHICLE INDEX
page page
Charging System Diagnostics (Fig. 1) ......... 19
Current Output Test ...................... 19 Output Wire Resistance Test
................ 19
CHARGING SYSTEM DIAGNOSTICS (Fig. 1)
OUTPUT WIRE RESISTANCE TEST
The generator output wire resistance test shows
the amount of voltage drop across the generator out-
put wire between the generator B+ terminal and the
positive battery post.
PREPARATION
Before starting test, make sure the vehicle has a
fully charged battery. Tests and procedures to check
for a fully charged battery is shown in the Battery
section. (1) Turn the ignition switch OFF.
(2) Disconnect battery NEGATIVE cable.
(3) Disconnect the generator B+ output wire from
the generator output battery terminal (Fig. 2). (4) Connect a 0-150 ampere scale (DC) ammeter in
series between B+ terminal and output wire (Fig. 2
and 3). Connect positive lead to B+ terminal, and
negative lead to output wire. (5) Using o-18 volt scale voltmeter, connect the
positive lead to the disconnected (B+) output wire
(Fig. 2). Connect the negative lead to positive battery
post. (6) Remove fresh air hose between Powertrain
Control Module and air cleaner if necessary. (7) Connect jumper wire between a good ground
and K20 circuit terminal at the back of the genera-
tor.
CAUTION: Do not connect the A142 circuit terminal
(Fig. 2) to ground the Fusible link will burn.
(8) Connect an engine tachometer and connect bat-
tery negative cable. (10) Connect a volt/amp tester equipped with a
variable carbon pile rheostat between battery termi-
nals (Fig. 4).
Caution: Be sure the carbon pile is in OFF position
before connecting leads.
TEST
(1) Start engine. Immediately after starting, re-
duce engine speed to idle. (2) Adjust engine speed and carbon pile to main-
tain 20 amperes flowing in the circuit. Observe volt-
meter reading. Voltmeter reading should not exceed
0.5 volts.
RESULTS
If a higher voltage drop is shown, inspect, clean
and tighten all connections between generator B+
terminal and battery positive post. A voltage drop
test may be performed at each connection to locate a
connection with excessive resistance. If resistance
tests are satisfactory, reduce engine speed, turn off
carbon pile, and turn off ignition switch. (1) Disconnect battery negative cable.
(2) Remove test ammeter, voltmeter, carbon pile,
and tachometer. (3) Remove jumper wire.
(4) Connect generator output wire to generator B+
terminal. (5) Connect battery negative cable.
(6) Connect fresh air hose between Powertrain
Control Module and air cleaner if removed.
CURRENT OUTPUT TEST
The current output test decides whether the gener-
ator can deliver its rated current output. For gener-
ator identification and output amperage
specifications, refer to Generator Specifications. For generator maximum voltage at individual tem-
peratures, refer to Generator Output Voltage Specifi-
cations.
PREPARATION
Before starting any tests, make sure the vehicle
has a fully charged battery. Tests and procedures to
check for a fully charged battery is shown in Battery
section. (1) Disconnect battery negative cable.
(2) Disconnect output wire at the B+ terminal
(Figs. 2 and 5). (3) Connect a 0-150 ampere scale (DC) ammeter in
series between the B+ terminal and output wire.
Connect Positive lead to B+ terminal and negative
lead to output wire. (4) Using 0-18 voltmeter, connect positive lead to
B+ terminal (Figs. 2 and 5). Connect negative lead
to a good ground.
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 19

(5) Connect an engine tachometer and connect bat-
tery negative cable. (6) Connect a volt/amp tester equipped with a vari-
able carbon pile rheostat between battery terminals
(Fig. 6). Be sure carbon pile is in OFF position before
connecting leads. (7) Remove fresh air hose between Powertrain
Control Module computer and air cleaner if neces-
sary. (8) Full field the generator. Connect a jumper wire
between a good ground and K20 circuit terminal at
the back of the generator (Figs. 2 and 5).
CAUTION: Do not connect the A142 circuit terminal
(Fig. 2) to ground. Fusible link will burn.
TEST
(1) Start the engine. Immediately after starting,
reduce engine speed to idle.
Fig. 2 Generator Wiring Connections
Fig. 3 Generator Output Wire Resistance Test
Fig. 4 Volt/Amp Tester Connections
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 21

(2) Adjust the carbon pile and engine speed in
steps until an engine speed of 1250 rpm, and a volt-
meter reading of 15 volts is obtained.
CAUTION: Do not allow the battery voltage to ex-
ceed 16 volts. (3) The generator amperage must meet the output
requirements for the particular generator being
tested. Refer to Generator Specifications for genera-
tor identification and amperage outputs.
RESULTS
(1) If amperage reading is less than specified, and
generator output wire resistance is not found exces-
sive from the previous tests, generator should be re-
placed. Refer to Group 8B, Battery/Starter/Generator
Service, Generator Replacement. These generators
are not intended to be disassembled for service. It
must be replaced as an assembly. (2) After current output test is completed, reduce
engine speed, turn off carbon pile, and turn off igni-
tion switch. (3) Disconnect battery negative cable.
(4) Remove test ammeter, voltmeter, tachometer
and carbon pile. (5) Remove jumper wire between K20 circuit ter-
minal and ground. (6) Connect output wire to B+ terminal.
(7) Connect negative battery cable.
(8) Connect fresh air hose between powertrain con-
trol module and air cleaner if removed.
Fig. 5 Generator Current Output Test
Fig. 6 Volt/Amp Tester Connections
8A - 22 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS Ä

When testing secondary cables for punctures and
cracks with an oscilloscope follow the equipment
manufacturers instructions. If an oscilloscope is not available, secondary cables
can be tested as follows:
CAUTION: Do not leave any one spark plug cable
disconnected any longer than necessary during test-
ing. Excessive heat could damage the catalytic con-
verter. Total test time must not exceed ten minutes.
(a) With the engine not running, connect one end
of a test probe to a good ground. Use a probe made of
insulated wire with insulated alligator clips on each
end. (b) With engine running, move test probe along
entire length of all cables (approximately 0 to 1/8
inch gap). If punctures or cracks are present there
will be a noticeable spark jump from the faulty area
to the probe. Check the coil cable the same way.
Replace cracked, leaking or faulty cables.
When replacing cables, install the new high
tension cable and nipple assembly over cap or
coil tower. When entering the terminal into the
tower, push lightly, then pinch the large diam-
eter of nipple to release air trapped between the
nipple and tower. Continue pushing on the cable
and nipple until cables are properly seated in the
cap towers. A snap should be heard as terminal
goes into place. Use the same procedure to install cable in coil tower.
Wipe the spark plug insulator clean before reinstalling
cable and cover. Use the following procedure when removing the high
tension cable from the spark plug. First, remove the
cable from the retaining bracket. Then grasp the ter-
minal as close as possible to the spark plug. Rotate the
cover and pull the cable straight back. Pulling on the
cable itself will damage the conductor and termi-
nal connection. Do not use pliers and do not pull
the cable at an angle. Doing so will damage the
insulation, cable terminal or the spark plug in-
sulator. Wipe spark plug insulator clean before
reinstalling cable and cover. Resistance type cable is identified by the words
Electronic Suppression printed on the cable jacket.
Use an ohmmeter to check resistance type cable for
open circuits, loose terminals or high resistance as
follows: (a) Remove cable from spark plug.
(b) Lift distributor cap from distributor with
cables intact. Do not remove cables from cap. The
cables must be removed from the spark plugs. (c) Connect the ohmmeter between spark plug end
terminal and the corresponding electrode inside the
cap, make sure ohmmeter probes are in good contact.
Resistance should be within tolerance shown in the cable resistance chart. If resistance is
not within tolerance, remove cable at cap tower
and check the cable. If resistance is still not within
tolerance, replace cable assembly. Test all spark
plug cables in same manner.
To test coil to distributor cap high tension cable,
remove distributor cap with the cable intact. Do not
remove cable from the cap. Connect the ohmmeter
between center contact in the cap and remove the ca-
ble at coil tower and check cable resistance. If resis-
tance is not within tolerance, replace the cable.
SPARK PLUGS
Resistor spark plugs are used in all engines and
have resistance values of 6,000 to 20,000 ohms when
checked with at least a 1000 volt tester. Remove the spark plugs and examine them for
burned electrodes and fouled, cracked or broken por-
celain insulators. Keep plugs arranged in the order
in which they were removed from the engine. An iso-
lated plug displaying an abnormal condition indi-
cates that a problem exists in the corresponding
cylinder. Replace spark plugs at the intervals recom-
mended in Group O. Undamaged low milage spark plugs can be cleaned
and reused. Refer to the Spark Plug Condition sec-
tion of this group. After cleaning, file the center elec-
trode flat with a small point file or jewelers file.
Adjust the gap between the electrodes (Fig. 6) to the
dimensions specified in the chart at the end of this
section. Always tighten spark plugs to the specified torque.
Over tightening can cause distortion and change
spark plug gap. Tighten spark plugs to 28 N Im (20 ft.
lbs.) torque.
SPARK PLUG CONDITION
NORMAL OPERATING CONDITIONS
The few deposits present will be probably light tan
or slightly gray in color with most grades of commer-
cial gasoline (Fig. 7). There will not be evidence of
electrode burning. Gap growth will not average more
than approximately 0.025 mm (.001 in) per 1600 km
(1000 miles) of operation. Spark plugs that have nor-
mal wear can usually be cleaned, have the electrodes
filed and regapped, and then reinstalled. Some fuel refiners in several areas of the United
States have introduced a manganese additive (MMT)
CABLE RESISTANCE CHART
Ä IGNITION SYSTEMS 8D - 3

make sure that the spark plugs are firing. Inspect the
distributor rotor, cap, spark plug cables, and spark
plugs. If they are in proper working order, the ignition
system is not the reason why the engine will not start.
Inspect the fuel system and engine for proper opera-
tion.
FAILURE TO START TESTÐ2.5L TBI AND 3.0L
ENGINES
Before proceeding with this test make sure
Testing For Spark At Coil has been performed.
Failure to do this may lead to unnecessary diag-
nostic time and wrong test results.
WARNING: BE SURE TO APPLY PARKING BRAKE
AND/OR BLOCK WHEELS BEFORE PERFORMING
ANY TEST WITH THE ENGINE RUNNING.
(1) Battery voltage must be at least 12.4 volts to
perform test. (2) Crank the engine for 5 seconds while monitoring
the voltage at the coil positive (+) terminal (Fig. 2 or
Fig. 3). If the voltage remains near zero during the
entire period of cranking, refer to Group 14 for On-
Board Diagnostic checks. Also, refer to the DRBII scan
tool and the appropriate Powertrain Diagnostic Proce-
dures manual. These checks will help diagnose prob-
lems with the PCM and auto shutdown relay. (3) If voltage is at near-battery voltage and drops to
zero after 1-2 seconds of cranking, refer to On-Board
Diagnostic in Group 14. Also, refer to the DRBII scan
tool and the appropriate Powertrain Diagnostic Proce-
dures manual. These tests will help check the distribu-
tor reference pickup circuit to the PCM. (4) If voltage remains at near battery voltage during
the entire 5 seconds, with the key off,remove the
PCM 60-way connector. Check the 60-way connector
for any terminals that are pushed out or loose. (5) Remove the connector to coil (+) and connect a
jumper wire between battery (+) and coil (+). (6) Using the special jumper (Fig. 4), momentarily ground terminal #19 of the 60-way connector (Fig.
5). A spark should be generated when the ground is
removed.
(7) If spark is generated, replace the PCM.
(8) If no spark is seen, use the special jumper to
ground the coil (-) terminal directly. (9) If spark is produced, inspect wiring harness for
an open condition.
Fig. 2 Coil TerminalsÐ2.2L TBI, 2.5L TBI and 2.5L MPI Engines
Fig. 3 Coil TerminalsÐ3.0L Engine
Fig. 4 Special Jumper to Ground Coil Negative
Fig. 1 Checking for Spark
8D - 12 IGNITION SYSTEMS Ä

(2) With engine running, move test probe along
entire length of all cables (approximately 0 to 1/8
inch gap). If punctures or cracks are present there
will be a noticeable spark jump from the faulty area
to the probe. Cracked, leaking or faulty cables should
be replaced. Use the following procedure when removing the
high tension cable from the spark plug. First, remove
the cable from the retaining bracket. Then grasp the
terminal as close as possible to the spark plug. Ro-
tate the cover (boot) slightly and pull straight back.
Do not use pliers and do not pull the cable at an
angle. Doing so will damage the insulation, cable
terminal or the spark plug insulator. Wipe spark
plug insulator clean before reinstalling cable
and cover. Resistance cables are identified by the words Elec-
tronic Suppression .
Use an ohmmeter to check cables for opens, loose
terminals or high resistance. (a) Remove cable from spark plug.
(b) Remove cable from the coil tower.
(c) Connect the ohmmeter between spark plug
end terminal and the coil end terminal. Resistance
should be within tolerance shown in the cable re-
sistance chart. If resistance is not within tolerance,
replace cable assembly. Test all spark plug cables
in same manner.
SPARK PLUG SERVICE
When replacing the spark plug cables, route the ca-
bles correctly and secure them in the appropriate re-
tainers. Incorrectly routed cables can cause the radio
to reproduce ignition noise. It can also cause cross ig-
nition of the spark plugs or short circuit the cables to
ground.
SPARK PLUG REMOVAL
Always remove cables by grasping at boot, rotating
the boot 1/2 turn, and pulling straight back in a
steady motion. (1) Prior to removing the spark plug spray com-
pressed air around the spark plug hole and the area
around the spark plug. (2) Remove the spark plug using a quality socket
with a rubber or foam insert. (3) Inspect the spark plug condition. Refer to
Spark Plug Condition in this section.
SPARK PLUG GAP ADJUSTMENT
Check the spark plug gap with a gap gauge. If the
gap is not correct, adjust it by bending the ground
electrode (Fig. 6).
SPARK PLUG INSTALLATION
(1) To avoid cross threading, start the spark plug
into the cylinder head by hand. (2) Tighten spark plugs to 28 N Im (20 ft. lbs.)
torque. (3) Install spark plug cables over spark plugs.
IDLE RPM TEST
WARNING: BE SURE TO APPLY PARKING BRAKE
AND/OR BLOCK WHEELS BEFORE PERFORMING
ANY ENGINE RUNNING TESTS.
Engine idle set rpmshould be tested and recorded
as it is when the vehicle is first brought into shop
for testing. This will assist in diagnosing complaints
of engine stalling, creeping and hard shifting on ve-
hicles equipped with automatic transaxle. Refer to the
Throttle Body Minimum Airflow procedures in Group
14.
IGNITION TIMING PROCEDURE
Ignition timing cannot be changed or set on Turbo
III, 3.3L or 3.8L engines. For diagnostic information,
refer to the DRBII scan tool and the appropriate
Powertrain Diagnostics Procedures manual.
CABLE RESISTANCE CHART
Fig. 6 Setting Spark Plug GapÐTypical
Ä IGNITION SYSTEMS 8D - 41

(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

TESTING PROCEDURES
MULTI-FUNCTION SWITCH TESTS AA, AC, AP, AND AY BODIES
The multi-function switch contains electrical cir-
cuitry for turn signal, cornering lamps (optional),
hazard warning, headlamp beam select, headlamp
optical horn, windshield wiper, pulse wipe, and wind-
shield washer switching. This integrated switch as-
sembly is mounted to the left hand side of the
steering column. Should any function of the switch
fail, the entire switch assembly must be replaced. Re-
fer to Fig. 1 for diagnosis. To test the switch, first disconnect the negative
battery cable, then remove the upper and lower col-
umn covers to gain access to the switch connector.
Remove switch connector. Using an ohmmeter, test
for continuity (no resistance) between the terminals
of the switch as shown in the following continuity
charts (Fig 2 or 3).
DUAL-FUNCTION SWITCH TESTSÐAG AND AJ BODIES
The dual-function switch contains electrical cir-
cuitry for hazard warning switching, and circuitry
and electronics for turn signal cancellation. The
switch assembly is mounted to the left hand side of
the steering column. To test the hazard warning portion of the switch,
first disconnect the negative battery cable, then re-
move the upper and lower steering column covers to
gain access to the switch connector. Remove switch
connector (Fig. 4). Using an ohmmeter, test for con-
tinuity between the terminals of the switch as shown
in the following continuity chart (Fig. 5). To test the cancellation portion of the switch:
(1) Reconnect battery and switch connector (Fig.
5). (2) Connect voltmeter positive lead (+) to pin 8
and negative lead (-) to ground. (3) Place ignition switch to the ON position. Volt-
meter should read battery voltage. If no voltage is
present, check feed wire to pin 8. If battery voltage is
present continue with switch test.
RIGHT CANCELLATION TEST (1) Connect one side of a jumper wire to pin 3 and
the other end of jumper wire to ground. (2) Connect the positive lead (+) of a voltmeter to
pin 5 and the negative lead (-) to ground.
CAUTION: Do not allow pin 5 to become grounded
during test, switch failure will result.
(3) With the ignition switch in the ON position,
push the cancellation pawl down and read the volt-
meter. (4) The voltmeter should show at least 9 volts. (5) If voltage is 0 to 8 volts the cancellation switch
is defective. If voltage is 9 volts or more the cancel-
lation switch is working correctly.
LEFT CANCELLATION TEST
(1) Connect one side of a jumper wire to pin 4 and
the other end of jumper wire to ground. (2) Connect the positive lead (+) of a voltmeter to
pin 5 and the negative lead (-) to ground.
CAUTION: Do not allow pin 5 to become grounded
during test, switch failure will result.
(3) With the ignition switch in the ON position,
push the cancellation pawl up and read the voltme-
ter. (4) The voltmeter should show at least 9 volts.
(5) If voltage is 0 to 8 volts the cancellation switch
is defective. If voltage is 9 volts or more the cancel-
lation switch is working correctly.
REMOTE TURN SIGNAL SWITCH TESTÐAA AND AJ BODIES
The remote turn signal switch is located on the left
side of the instrument panel switch pod. To test, re-
move switch pod assembly from instrument panel.
Using an ohmmeter, test for continuity between the
terminals of the switch as shown in the following
continuity chart (Fig. 6). The white 7 way connector
next to the 14 way connector must be connected
when performing continuity checks.
CANCELLATION SOLENOID TESTÐAG AND AJ BODIES
To test the turn signal cancellation solenoid:
(1) Remove switch pod from instrument panel.
(2) Connect one end of a jumper wire to the posi-
tive terminal of the battery, the other end to pin 6 of
the turn signal switch 14 way connector. (3) Place turn signal switch in the left turn mode.
(4) Take a second jumper wire and connect one end
to a good ground. Momentarily touch the other end of
the jumper wire to pin 11 or 14. The solenoid should
energize, and return the switch to its center OFF po-
sition. (5) Place turn signal switch in the right turn
mode. (6) Repeat step 4. The solenoid should energize,
and return the switch to its center OFF position. (7) If switch does not return to center in either di-
rection, the switch is defective.
MULTI-FUNCTION SWITCHÐAA, AC, AP AND AY
BODIES
REMOVAL
(1) Disconnect negative battery cable.
(2) Tilt column only remove tilt lever.
8J - 2 TURN SIGNALS AND HAZARD WARNING FLASHER Ä

POWER SEATS
CONTENTS
page page
ADJUSTER ............................. 3
CIRCUIT BREAKER TEST .................. 1
ENTHUSIAST SEAT ....................... 4
GENERAL INFORMATION .................. 1
HARNESS VOLTAGE TEST ................. 1
HORIZONTAL AND VERTICAL TRANSMISSIONS ....................... 3
MEMORY CONTROL MODULE REPLACEMENT ....................... 19
MOTOR ................................ 3
MOTOR TESTS .......................... 1
POWER MEMORY SEAT, RECLINER AND MIRRORS ............................. 5 POWER MEMORY SEAT, RECLINER AND
MIRRORS DIAGNOSIS ................... 9
POWER RECLINER MECHANISM ........... 18
POWER RECLINER MOTOR AND CABLE ..... 17
RECLINER SWITCH REPLACEMENT ......... 19
RECLINER SWITCH TEST ................. 19
SEAT ASSEMBLY ........................ 3
SWITCH REPLACEMENT REMOVAL .......... 5
SWITCH TEST ........................... 5
SWITCH TEST ........................... 3
TEST PROCEDURES ...................... 6
TEST PROCEDURES ...................... 1
GENERAL INFORMATION
Power seats can be adjusted in six different direc-
tions up, down, forward, back, tilt forward, or tilt
rearward. A three armature permanent magnet reversible mo-
tor is coupled through cables to worm gear box assem-
blies located in the seat tracks, providing the various
seat movements. The electrical circuit is protected by a 30 amp circuit
breaker located on the fuse block.
TEST PROCEDURES
Before any testing is attempted the battery should be
carefully charged and all connections and terminals
cleaned and tightened to insure proper continuity and
grounds. With dome lamp on, apply switch in direction of
failure. If dome lamp dims the seat motor is trying to
work indicating mechanical jamming. If dome lamp
does not dim, then proceed with the following electrical
tests.
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 circuit breaker
for battery voltage. If only one terminal checks at
battery voltage, circuit breaker is defective and must
be replaced. If neither terminal shows battery voltage,
check for open or shorted circuit to circuit breaker.
HARNESS VOLTAGE TEST
The following test will determine whether or not
voltage is continuous through the body harness to the
switch. (1) Remove power seat switch from mounting posi-
tion and disconnect switch from wiring harness. (2) Connect one lead of test light to ground terminal,
black wire (BK) of center section, and touch other test
light lead to red wire (RD) terminal. (3) If test light comes on, harness to switch is good.
If test light does not come on, perform circuit breaker
test.
MOTOR TESTS
AA BODY
(1) Remove switch from mounting position and dis-
connect from harness. (2) To check the center motor, connect a jumper wire
between pin 5 and pin 3 (Fig. 1). Connect a second
jumper wire between pin 7 and pin 4 If motor does not
operate, reverse the jumpers, pin 5 to pin 4 and pin 7 to
pin 3. If motor still does not operate check wiring
between switch connector and motor assembly. If wir-
ing checks good replace motor assembly. (3) To check the front motor, connect a jumper wire
between pin 5 and pin 1 (Fig. 1). Connect a second
jumper wire between pin 7 and pin 8. If motor does not
operate, reverse the jumpers, pin 5 to pin 8 and pin 7 to
pin 1. If motor still does not operate check wiring
between switch connector and motor assembly. If wir-
ing checks good replace motor assembly.
(4) To check the rear motor, connect a covered jumper
wire between pin 5 and pin 6 (Fig. 1). Connect a second
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