ISUZU TROOPER 1998 Service Repair Manual

SUPPLEMENTAL RESTRAINT SYSTEM 9J±24
NOTE: Ensure that the pigtail adapter is firmly seated into
the pretensioner seat belt assembly connector. Failure to
fully seat the connectors may leave the shorting bar
located in the pretensioner seat belt assembly connector
functioning (shorted) and may result in nondeployment of
the pretensioner seat belt assembly.
13. Separate the two banana plugs on the SRS
deployment harness.
NOTE: When the pretensioner seat belt deploys, the
rapid gas expansion will create a substantial noise. Notify
all people in the immediate area that you intend to deploy
the pretensioner seat belt.
WARNING: D E P L O Y M E N T HARNESS SHALL
REMAIN SHORTED AND NOT BE CONNECTED TO A
POWER SOURCE UNTIL THE PRETENSIONER SEAT
BELT IS TO BE DEPLOYED. THE PRETENSIONER
SEAT BELT ASSEMBLY WILL IMMEDIATELY
DEPLOY THE PRETENSIONER SEAT BELT WHEN A
POWER SOURCE IS CONNECTED TO IT.
CONNECTING THE DEPLOYMENT HARNESS TO
THE POWER SOURCE SHOULD ALWAYS BE THE
LAST STEP IN THE PRETENSIONER SEAT BELT
ASSEMBLY DEPLOYMENT PROCEDURE. FAILURE
TO FOLLOW PROCEDURES IN THE ORDER LISTED
MAY RESULT IN PERSONAL INJURY.
14. Connect the SRS deployment harness wires to the
power source to immediately deploy the pretensioner
seat belt. Recommended application: 12 volts
minimum, 2 amps minimum. A vehicle battery is
suggested.
15. Disconnect the SRS deployment harness from the
power source.
16. Short the two SRS deployment harness leads
together by fully seating one banana plug into the
other.
17. In the unlikely event that the pretensioner seat belt
assembly did not deploy after following these
procedures, proceed immediately with Steps 21
through 24. If the pretensioner seat belt assembly did
deploy, proceed with Steps 15 through 20.
18.
WARNING: S A F E T Y P R ECAUTIONS MUST BE
OBSERVED WHEN HANDING A DEPLOYED
PRETENSIONER SEAT BELT ASSEMBLY. AFTER
DEPLOYMENT, THE METAL SURFACES OF THE
PRETENSIONER SEAT BELT ASSEMBLY WILL BE
VERY HOT. ALLOW THE INFLATOR MODULE TO
COOL BEFORE HANDLING ANY METAL PORTION
OF IT. DO NOT PLACE THE DEPLOYED
PRETENSIONER SEAT BELT ASSEMBLY NEAR ANY
FLAMMABLE OBJECTS. FAILURE TO FOLLOW
PROCEDURES MAY RESULT IN FIRE OR PERSONAL
INJURY.
AFTER A DRIVER PRETENSIONER SEAT BELT
ASSEMBLY HAS BEEN DEPLOYED, THE METAL
CANISTER AND SURROUNDING AREAS OF THE
DRIVER PRETENSIONER SEAT BELT ASSEMBLY
WILL BE VERY HOT. DO NOT TOUCH THE METAL
AREAS OF THE PRETENSIONER SEAT BELT
ASSEMBLY FOR ABOUT TEN MINUTES AFTER
DEPLOYMENT. IF THE DEPLOYED PRETENSIONERSEAT BELT ASSEMBLY MUST BE MOVED BEFORE
IT IS COOL, WEAR GLOVES AND HANDLE BY THE
PRETENSIONER SEAT BELT OR TRIM COVER.
19. Disconnect the pigtail adapter from the pretensioner
seat belt assembly as soon after deployment as
possible. This will prevent damage to the pigtail
adapter or SRS deployment harness due to possible
contact with the hot pretensioner seat belt assembly
canister. The pigtail adapter can be reused. They
should, however, be inspected for damage after each
deployment and replaced if necessary.
20. Dispose of the deployed pretensioner seat belt
assembly through normal refuse channels after it has
cooled for at least 30 minutes.
21. Wash your hands with mild soap and water afterward.
NOTE: The remaining steps are to be followed in the
unlikely event that the pretensioner seat belt assembly
did not deploy after following these procedures.
22. Ensure that the SRS deployment harness has been
disconnected from the power source and that its two
banana plugs have been shorted together by fully
seating one banana plug into the other.
23. Disconnect the pigtail adapter from the pretensioner
seat belt assembly.
24. Remove the undeployed pretensioner seat belt from
the special tool.
WARNING: W H E N S T O R I N G A L I V E
PRETENSIONER SEAT BELT ASSEMBLY OR WHEN
LEAVING A LIVE INFLATOR MODULE UNATTENDED
ON A BENCH OR OTHER SURFACE, ALWAYS PUT
THE PRETENSIONER SEAT BELT HORIZONTAL
PLACE. THIS IS NECESSARY SO THAT A FREE
SPACE IS PROVIDED TO ALLOW THE
PRETENSIONER SEAT BELT TO SHRINK IN THE
UNLIKELY EVENT OF ACCIDENTAL DEPLOYMENT.
FAILURE TO FOLLOW PROCEDURES MAY RESULT
IN PERSONAL INJURY.
25. Temporarily store the pretensioner seat belt
assembly with its deployment device facing up, away
from the surface upon which it rests.
Deployment Inside Vehicle (Pretensioner
Seat Belt Vehicle Scrapping Procedure)
Deployment inside vehicle is proper when the vehicle is to
be destroyed. This includes, but is not limited to, the
following situations:
1. The vehicle has completed its useful life.
2. The vehicle has been damaged beyond repair in a
nondeployment type accident.
3. The vehicle has been stripped or damaged beyond
repair in a theft.
NOTE: The vehicle will be salvaged for component parts
to be used on a vehicle with a different Vehicle
Identification Number (VIN) as opposed to being rebuilt
as same VIN. Never use pretensioner seat belt
components from another vehicle.
WARNING: FAILURE TO FOLLOW PROCEDURES IN
THE ORDER LISTED COULD RESULT IN PERSONAL
INJURY. NEVER CONNECT DEPLOYMENT WIRES

SUPPLEMENTAL RESTRAINT SYSTEM9J±25
TO ANY POWER SOURCE BEFORE CONNECTING
DEPLOYMENT WIRES TO THE PRETENSIONER
SEAT BELT ASSEMBLY LEADS. DEPLOYMENT
WIRES SHALL REMAIN SHORTED AND NOT BE
CONNECTED TO A POWER SOURCE UNTIL THE
PRETENSIONER SEAT BELT IS TO BE DEPLOYED.
THE PRETENSIONER SEAT BELT ASSEMBLY WILL
IMMEDIATELY DEPLOY THE PRETENSIONER SEAT
BELT WHEN A POWER SOURCE IS CONNECTED TO
IT. WEAR SAFETY GLASSES THROUGHOUT THIS
ENTIRE DEPLOYMENT AND DISPOSAL
PROCEDURE.
1. Turn ignition switch to ªLOCK,º remove key and put
on safety glasses.
2. Remove all loose objects from front seats.
3. Disconnect pretensioner seat belt assembly, yellow
2±pin connector located at the base of the seat.
4. Prepare SRS deployment harness.
5. Short the two SRS deployment harness leads
together by fully seating one banana plug into the
other.
6. Deployment harness shall remain shorted and not be
connected to a power source until the pretensioner
seat belt is to be deployed.
7. Route deployment harness out the driver side of the
vehicle.
8. Verify that the inside of the vehicle and the area
surrounding the vehicle are clear of all people and
loose or flammable objects.
9. Stretch the SRS deployment harness to their full
length.
10. Connect the deployment harness to the pretensioner
seat belt assembly, yellow 2-pin connector at the
base of the seat.
WARNING: DEPLOYMENT WIRES SHALL REMAIN
SHORTED AND NOT BE CONNECTED TO A POWER
SOURCE UNTIL THE PRETENSIONER SEAT BELT IS
TO BE DEPLOYED. THE PRETENSIONER SEAT
BELT ASSEMBLY WILL IMMEDIATELY DEPLOY THE
PRETENSIONER SEAT BELT WHEN A POWER
SOURCE IS CONNECTED TO IT. CONNECTING THE
DEPLOYMENT WIRES TO THE POWER SOURCE
SHOULD ALWAYS BE THE FINAL STEP IN THE
PRETENSIONER SEAT BELT ASSEMBLY
DEPLOYMENT PROCEDURE. FAILURE TO FOLLOW
PROCEDURES IN THE ORDER LISTED COULD
RESULT IN PERSONAL INJURY.
11. Notify all people in the immediate area that you intend
to deploy the pretensioner seat belt. The deployment
will be accompanied by a substantial noise which may
startle the uninformed.
12. Separate the two banana plugs on the SRS
deployment harness.
NOTE: When the pretensioner seat belt deploys, the
rapid gas expansion will create a substantial noise. Notify
all people in the immediate area that you intend to deploy
the pretensioner seat belt.13. Connect the SRS deployment harness wires to a
power source to immediately deploy the pretensioner
seat belt assembly. Recommended application: 12
volts minimum, 2 amps minimum. A vehicle battery is
suggested.
WARNING: DEPLOYMENT WIRES SHALL REMAIN
SHORTED AND NOT BE CONNECTED TO A POWER
SOURCE UNTIL THE PRETENSIONER SEAT BELT IS
TO IS TO BE DEPLOYED. THE PRETENSIONER
SEAT BELT ASSEMBLY WILL IMMEDIATELY
DEPLOY THE PRETENSIONER SEAT BELT WHEN A
POWER SOURCE IS CONNECTED TO IT.
CONNECTING THE DEPLOYMENT WIRES SHOULD
ALWAYS BE THE FINAL STEP IN THE
PRETENSIONER SEAT BELT ASSEMBLY
DEPLOYMENT PROCEDURE. FAILURE TO FOLLOW
PROCEDURES IN THE ORDER LISTED COULD
RESULT IN PERSONAL INJURY.
14. Short the two SRS deployment harness leads
together by fully seating one banana plug into the
other.
15. Disconnect the deployment harness to the
pretensioner seat belt assembly, yellow 2-pin
connector at the base of the seat.
16. In the unlikely event that the pretensioner seat belt
assembly did not deploy after following these
procedures, proceed immediately with Steps 18
through 19. If the pretensioner seat belt assembly
deployed as intended, proceed with Steps 14 through
17.
17. With both air bags and pretensioner seat belt
deployed, the vehicle may be scrapped in the same
manner as a non±SRS equipped vehicle.
NOTE: The remaining steps are to be followed in the
unlikely event that the pretensioner seat belt assembly
did not deploy after following these procedures.
18. Remove the undeployed pretensioner seat belt
assembly (s) from the vehicle. For pretensioner seat
belt assembly refer to in the ªPretensioner Seat Belt
Assembly Removalº in this manual.
19. Temporarily store the pretensioner seat belt
assembly with the deployment device facing up, away
from the surface upon which it rests.

SUPPLEMENTAL RESTRAINT SYSTEM 9J±26
Special Tools
WARNING: T O AV O I D D E P L O Y M E N T W H E N
TROUBLESHOOTING THE SRS, DO NOT USE
ELECTRICAL TEST EQUIPMENT SUCH AS A
BATTERY±POWERED OR AC±POWERED
VOLTMETER, OHMMETER, ETC., OR ANY TYPE OF
ELECTRICAL EQUIPMENT OTHER THAN THAT
SPECIFIED IN THIS MANUAL. DO NOT USE A
NONPOWERED PROBE±TYPE TESTER.
INSTRUCTIONS IN THIS MANUAL MUST BE
FOLLOWED CAREFULLY, OTHERWISE PERSONAL
INJURY MAY RESULT.
5±8840±2421±0 SRS Driver/Passenger
Load Tool
901RS146The SRS Driver/Passenger Load Tool 5±8840±2421±0 is
used only when called for in this section. It is used as a
diagnostic aid and safety device to prevent inadvertent air
bag assembly deployment.
The load tool has three yellow connectors attached to its
case.
The three small connectors are electrically functional and
serve as resistive load substitutions.
No more than two connectors are used at any time. One
of the small connectors is used to substitute for the load of
the driver air bag assembly when it is connected at the top
of the column to the SRS coil assembly. Another small
connector is used to substitute for the load of the driver air
bag assembly and the SRS coil assembly when it is
connected at the base of the column to the SRS wiring
harness. The third small connector is used to substitute
for the load of the passenger air bag assembly and
pretensioner seat belt assembly when connected to the
passenger air bag assembly and pretensioner seat belt
assembly harness connector.
By substituting the resistance of the load tool when called
for, a determination can be made as to whether an inflator
circuit component is causing system malfunction and
which component is causing the malfunction. The loadtool should be used only when specifically called for in the
diagnostic procedures.
NOTE: If comand to use 5±8840±2421±0 load tool when
repair the pretensioner seat belt, connect load tool
connector to use for driver air bag and/or passenger air
bag connector.
5±8840±0285±0 DVM
901RS153The 5±8840±0285±0 DVM is the preferred DVM for use in
SRS diagnosis and repair. However, 5±8840±0366±0
may be used if 5±8840±0285±0 is not available. No other
DVMs are approved for SRS diagnosis and repair.
Scan Tool
901RW176The Tech 2 is used to read and clear SRS Diagnostic
Trouble Codes (DTCs). Refer to the Tech 2 Operators,
Manual for specific information on how to use the Tech 2.

SUPPLEMENTAL RESTRAINT SYSTEM9J±27
5±8840±0385±0 Connector Test Adapter
Kit
901RS151The 5±8840±0385±0 Connector Test Adapter Kit must be
used whenever a diagnostic procedure requests
checking or probing a terminal. Using the appropriate
adapter will ensure that no damage to the terminal will
occur from the DVM prove, such as spreading or bending.
The adapter will also give an idea of whether contact
tension is sufficient, helping to find an open or intermittent
open due to poor terminal contact.
5±8840±2468±0 SRS Deployment Tool
901RW106The 5±8840±2468±0 SRS Deployment Tool must be
used for deployment of the undeployed air bag, and/or
pretensioner seat belt.
5±8840±2420±0 SRS Deployment Fixture
901RW199The 5±8840±2420±0 SRS Deployment Fixture must be
used for deployment of the undeployed passenger side
air bag.
5±8840±2469±0 SRS Adapter for Load
Tool.
901RW107The 5±8840±2469±0 SRS Adapter for Load Tool must be
used with 5±8840±2421±0 SRS Driver/Passenger Load
Tool.

SUPPLEMENTAL RESTRAINT SYSTEM 9J±28
Tech 2 Scan Tool
From 98 MY, Isuzu dealer service departments are
recommended to use Tech 2. Please refer to Tech 2 scan
tool user guide.
901RW200
Legend
(1) PCMCIA Card
(2) RS 232 Loop Back Connector
(3) SAE 16/19 Adaptor
(4) DLC Cable
(5) Tech±2
Getting Started

Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:
1. Insert the Isuzu 98 System PCMCIA card (1) into the
Tech 2 (5).
2. Connect the SAE 16/19 adapter (3) to the DLC cable
(4).3. Connect the DLC cable to the Tech 2 (5)
4. Make sure of the vehicle ignition is off.
5. Connect the Tech 2 SAE 16/19 adapter to the vehicle
ALDL/DLC connector.
060RW220
Legend
(1) For RHD model
(2) For LHD model
6. Turn on the vehicle ignition switch.
7. Verify the Tech 2 power up display.
060RW009
NOTE: The RS232 Loop back connector is only used to
diagnosis Tech 2. Refer to user guide of the Tech 2.

SUPPLEMENTAL RESTRAINT SYSTEM9J±29
Operating Procedure
The power up screen is displayed when you power up the
tester with the Isuzu systems PCMCIA card. Follow the
operating procedure below.
060RX038
060RW019

SUPPLEMENTAL RESTRAINT SYSTEM 9J±30
Service Precautions for SRS
Component Service
CAUTION: When fasteners are removed, always
reinstall them at the same location from which they
were removed. If a fastener needs to be replaced, use
the correct part number fastener for that application.
If the correct part number fastener is not available, a
fastener of equal size and strength (or stronger) may
be used. fasteners that are not reused, and those
requiring thread locking compound will be called
out. The correct torque value must be used when
installing fasteners that require it. If the above
conditions are not followed, parts or system damage
could result.
WARNING: WHEN PERFORMING SERVICE ON OR
AROUND SRS COMPONENTS OR SRS WIRING,
FOLLOW THE PROCEDURES LISTED BELOW TO
TEMPORARILY DISABLE THE SRS. FAILURE TO
FOLLOW PROCEDURES COULD RESULT IN
POSSIBLE AIR BAG DEPLOYMENT, PERSONAL
INJURY OR OTHERWISE UNNEEDED SRS REPAIRS.
The SDM in Driver±Passenger SRS can maintain
sufficient voltage to cause a deployment for up to 15
seconds after the ignition switch is turned ªOFF,º the
battery is disconnected, or the fuse powering the SDM is
removed.
Many of the service procedures require removal of the
ªC±21º fuse, and disconnection of the air bag assembly
from the deployment loop to avoid an accidental
deployment. If the air bag assembly is disconnected from
the deployment loop as noted in the ªDisabling the SRSº
procedure that follows, service can begin immediately
without waiting for the 15 second time period to expire.
Disabling The SRS
Removal
Turn the ignition switch to ªOFFº and turn the steering
wheel so that the vehicle's wheels are pointing straight
ahead.
1. Remove SRS fuse ªC±21º from left dash side lower
fuse block or disconnect battery.
2. Disconnect yellow 2±pin connector at the base of
steering column.
3. Remove glove box assembly; Refer to ªPassenger air
bag assembly replacementº in this section.
4. Disconnect passenger air bag assembly yellow 2±pin
connector behind the glove box assembly.
CAUTION: W i t h t h e ª C±21º fuse removed and
ignition switch ªON,º the ªAIR BAGº warning lamp
will be ªON.º This is normal operation and does not
indicate an SRS malfunction.
Enabling The SRS
Installation
Turn ignition switch to ªLOCKº and remove key.
1. Connect yellow 2±pin connector passenger air bag
assembly.2. Install glove box assembly. Refer to ªPassenger Air
Bag Assembly Replacementº in this section.
3. Connect yellow 2±pin connector at the base of the
steering column.
4. Install ªAIR BAGº fuse ªC±21º to left dash side lower
fuse block or connect battery.
Turn ignition switch to ªONº and verify that the ªAIR BAGº
warning lamp turn on 3.5 seconds and then turns ªOFF.º If
it does not operate as described, perform the ªSRS
Diagnostic System Checkº in this section.
Handling / Installation / Diagnosis
1. Air bag assembly should not be subjected to
temperatures above 93
C (200
F).
2. Air bag assembly, and SDM should not be used if they
have been dropped from a height of 100 centimeters
(3.28 feet) or more.
3. When a SDM is replaced, it must be oriented with the
arrow on the SDM pointing toward the front of the
vehicle. It is very important for the SDM to be located
flat on the mounting surface, parallel to the vehicle
datum line. It is important that the SDM mounting
surface is free of any dirt or other foreign material.
4. Do not apply power to the SRS unless all components
are connected or a diagnostic chart requests it, as
this will set a diagnostic trouble code.
5. The ªSRS Diagnostic System Checkº must be the
starting point of any SRS diagnostics. The ªSRS
Diagnostic System Checkº will verify proper ªAIR
BAGº warning lamp operation and will lead you to the
correct chart to diagnose any SRS malfunctions.
Bypassing these procedures may result in extended
diagnostic time, incorrect diagnosis, and incorrect
parts replacements.
Inspections Required After An Accident
CAUTION: C e r t a i n S R S c o mponents must be
replaced after a frontal crash involving air bag
deployment.
In all types of accidents regardless of ªAir Bagº
deployment, visually inspect all of the following
components and replace as required:
Ð Driver air bag assembly
Ð Passenger air bag assembly
Ð Driver pretensioner assembly
Ð Passenger pretensioner assembly
Ð Steering wheel
Ð SRS coil assembly
Ð Steering column
Ð Knee bolster and instrument panel mounting
attachments
Ð Driver seat and belt
Ð Passenger seat and belt
Ð SDM
SDM always should be checked according to ªSDM
Replacement Guidelines.º

SUPPLEMENTAL RESTRAINT SYSTEM9J±31
CAUTION: Refer to ªSDM Replacement Guidelinesº
below for important information on SDM
replacement in both deployment and
non±deployment crashes.
Inspect SRS coil assembly wiring and steering wheel for
any sign of scorching, melting, or damage due to
excessive heat. If coil assembly wire or steering wheel is
damaged, replace them. The steering column and wheel
must be dimensionally checked to determine if they are
damaged. Refer to steering wheel of in this manual.
Never use SRS parts from another vehicle. This does not
include remanufactured parts purchased from an
authorized Isuzu Retailer; they may be used for SRS
repairs.
Do not attempt to repair the SDM, the SRS harness, the
SRS coil assembly, the air bag assembly, the steering
wheel, or the steering column. Service of these items is
replacement only. Verify replacement part numbers.
CAUTION: P r o p e r o p e r a t i o n o f t h e S D M a n d
supplemental restraint system (SRS) requires that
any repairs to the vehicle structure return it to its
original production configuration.
SRS Connectors
CAUTION:The special yellow color connectors are
used for supplemental restraint system air bag circuit.
When removing the oable harnese, do not pull the cables
otherwile, cable disconnection may occur. When connect
the SRS connector, insert the connector completely.
Imperfect locking may cause malfunction of SRS circuit.
Removal
To remove the connector, hold the cover insulator (1) and
pull it. The cover insulator slides and lock will be released.
Do not hold the socket insulator (2).
827RW028

SUPPLEMENTAL RESTRAINT SYSTEM 9J±32
Installation
To install the connector, hold the socket insulator (1) and
insert it. The cover insulator slides and connector will be
locked. Do not hold the cover insulator (2).
827RW027

SUPPLEMENTAL RESTRAINT SYSTEM9J±33
Sensing And Diagnostic Module (SDM)
Service Precautions
WARNING:DURING SERVICE PROCEDURES, BE
VERY CAREFUL WHEN HANDLING SDM. NEVER
STRIKE OR JAR SDM. UNDER SOME
CIRCUMSTANCES, IT COULD CAUSE
DEPLOYMENT AND RESULT IN PERSONAL INJURY
OR IMPROPER OPERATION OF THE
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) . SDM
MOUNTING BRACKET BOLTS MUST BE
CAREFULLY TORQUED TO ASSURE PROPER
OPERATION. NEVER POWER UP THE SRS WHEN
SDM IS NOT RIGIDLY ATTACHED TO THE VEHICLE.
THE SDM COULD BE ACTIVATED WHEN POWERED
WHILE NOT RIGIDLY ATTACHED TO THE VEHICLE
WHICH COULD CAUSE DEPLOYMENT AND RESULT
IN PERSONAL INJURY.
WARNING: PROPER OPERATION OF THE SENSING
AND DIAGNOSTIC MODULE (SDM) REQUIRES THE
SDM TO BE RIGIDLY ATTACHED TO THE VEHICLE
STRUCTURE AND THAT THE ARROW ON THE
SENSOR BE POINTING TOWARD THE FRONT OF
THE VEHICLE.
SDM is specifically calibrated and is keyed to the SDM
location SRS wiring harness. Caution should be used to
ensure proper location of the SDM. The keying of the
SDM to its location and wiring harness connectors should
never be modified in the field.
Removal
1. Disable the SRS (Refer to ªDisabling the SRSº in this
section).
2. Remove the transmission knob (for M/T) and transfer
lever knob.
3. Remove the front console assembly and disconnect
wiring harness connector.
4. Pull CPA (Connector Position Assurance) out and
push connector lock down to disconnect the SDM
harness connector.
5. Remove the three SDM fixing bolts and remove SDM.
827RW044
Legend
(1) SDM
(2) SRS Harness
(3) Connector Position Assurance
Installation
1. Install the SDM on bracket and fixing bolts and tighten
the fixing bolts to the specified torque.
Torque: 10 N´m (1.0 Kg´m/87 Ib in)
2. Connect the SDM harness connector and after that,
put CPA into connector.
3. Install the front console.
4. Install the transmission knob (for M/T) and transfer
lever knob.