1998 ISUZU TROOPER wheel

9AÐ8 SEAT BELT SYSTEM
760RW025
Legend
(1) Rear Seat Belt Upper Anchor Bolt Cover and
Anchor Bolt
(2) Quarter Upper Trim Cover
(3) Dust Cover
(4) Retractor(5) Rear Seat Belt Lower Anchor Bolt Cover and
Anchor Bolt
(6) Luggage Side Trim Cover
(7) Rear End Floor Trim Cover
(8) Rear Seat Belt Assembly
Rear Seat Belt and Associated Parts (Short Wheel Base)
1
82
34
56
7
Removal
1. Disconnect the battery ground cable.
2. Remove the rear seat belt lower anchor bolt cover (1)
and anchor bolt (2).1
2
755RW038

9AÐ10 SEAT BELT SYSTEM
Third Seat Belt and Associated Parts (Long Wheel Base)
65 1
2
3
4
7
760RW027
Legend
(1) Third Seat Belt Upper Anchor Bolt Cover and
Anchor Bolt
(2) Third Seat Belt Assembly
(3) Dust Cover(4) Retractor
(5) Luggage Side Trim Cover
(6) Third Seat Belt Lower Anchor Bolt Cover and
Anchor Bolt
(7) Rear End Floor Trim Cover
Removal
1. Disconnect the battery ground cable.
2. Remove the rear end floor trim cover.
3. Remove the luggage side trim cover.
cRefer to Luggage Side and Quarter Upper Trim
Panel removal steps in Exterior/Interior Trim
section.
4. Remove the third seat belt anchor bolt cover and
anchor bolt (Upper Side).
5. Remove the seat belt lower anchor bolt and remove
the retractor from dust cover slit to remove the third
seat belt.
1
755RW043

SEAT BELT SYSTEM 9AÐ13
Rear Center Seat Belt Buckle Assembly
Rear Center Seat Belt Buckle Assembly and Associated Parts
2
2
1
4
3
3
760RW026
Legend
(1) Long Wheel Base
(2) Rear Seat Belt Buckle Assembly(3) Seat Lock Cover
(4) Short Wheel Base
Removal
1. Remove the catch portions(2) & (3) of the seat lock
assembly(4) from the cover, and then remove the seat
lock cover(1).
2. Remove the rear seat buckle assembly.
Installation
1. Fix the rear seat belt buckle assembly(1) to the
rotation stopper and tighten the anchor bolt to the
specified torque.
Torque: 39 Nám (4.0 kgám/29 lb ft)
2. Install the seat lock cover.
1
2 4
3
760RW016
1
760RW013

SUPPLEMENTAL RESTRAINT SYSTEM9J±1
RESTRAINTS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
CONTENTS
Service Precaution 9J±1. . . . . . . . . . . . . . . . . . . . . .
General Description 9J±2. . . . . . . . . . . . . . . . . . . . .
SRS Component And Wiring Location View 9J±4.
Component Description 9J±4. . . . . . . . . . . . . . . . . .
Definitions 9J±7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis 9J±8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS Connector Body Face Views 9J±9. . . . . . . . .
Repairs And Inspections Required After
An Accident 9J±9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
On±Vehicle Service 9J±10. . . . . . . . . . . . . . . . . . . . . .
Air Bag Assembly Handling / Shipping
/ Scrapping 9J±11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pretensioner Seat Belt Handling / Shipping
/ Scrapping. 9J±11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 9J±26. . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Precautions for SRS Component
Service 9J±30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS Connectors 9J±31. . . . . . . . . . . . . . . . . . . . . . . .
Sensing And Diagnostic Module (SDM) 9J±33. . . .
Service Precautions 9J±33. . . . . . . . . . . . . . . . . . .
Removal 9J±33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9J±33. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Air Bag Assembly 9J±35. . . . . . . . . . . . . . . . .
Service Precautions 9J±35. . . . . . . . . . . . . . . . . . .
Removal 9J±35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9J±36. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering Wheel 9J±37. . . . . . . . . . . . . . . . . . . . . . . . . Service Precautions 9J±37. . . . . . . . . . . . . . . . . . .
Removal 9J±37. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9J±38. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS Coil Assembly 9J±39. . . . . . . . . . . . . . . . . . . . . .
Service Precautions 9J±39. . . . . . . . . . . . . . . . . . .
Removal 9J±39. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9J±41. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS Coil Replacement Procedure 9J±42. . . . . . . . .
Removal 9J±42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Disconnect the horn terminal 9J±43. . . . .
How to Connect Horn Terminal 9J±43. . . . . . . . . .
Installation 9J±44. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering Column 9J±44. . . . . . . . . . . . . . . . . . . . . . . .
Service Precautions 9J±44. . . . . . . . . . . . . . . . . . .
Removal 9J±44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9J±46. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Passenger Air Bag Assembly 9J±48. . . . . . . . . . . . .
Service Precautions 9J±48. . . . . . . . . . . . . . . . . . .
Removal 9J±48. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9J±48. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pretensioner Seat Belt (If so equipped) 9J±49. . . .
Service Precaution 9J±49. . . . . . . . . . . . . . . . . . . .
Parts Location 9J±49. . . . . . . . . . . . . . . . . . . . . . . .
Removal 9J±49. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9J±49. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications 9J±50. . . . . . . . . . . . .
Service Precaution
WARNING: I F S O E Q U IPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

SUPPLEMENTAL RESTRAINT SYSTEM 9J±2
General Description
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.
Restraint Devices
827RW006
Legend
(1) Deployed Air Bag
(2) Knee Bolster
(3) Seat Belt
The Supplemental Restraint System (SRS) helps
supplement the protection offered by the driver and front
passenger seat belts by deploying an air bag from the
center of the steering wheel and from the top of the right
side of the instrument panel.
The air bag deploys when the vehicle is involved in a
frontal crash of sufficient force up to 30 degrees off the
centerline of the vehicle. To further absorb the crash
energy there is a knee bolster located beneath the
instrument panel for both the driver and passenger, and
the steering column is collapsible.
827RW005

SUPPLEMENTAL RESTRAINT SYSTEM9J±5
1. Energy Reserve Ð The SDM maintains 24±Volt Loop
Reserve (24VLR) energy supply to provide
deployment energy when ignition voltage is lost in a
frontal crash.
2. Frontal Crash Detection Ð The SDM monitors
vehicle velocity changes to detect frontal crashes
which are severe enough to warrant deployment.
3. Air Bag Deployment Ð When a frontal crash of
sufficient force is detected, the SDM will cause
enough current to flow through the air bag assembly
to deploy the air bag.
4. Malfunction Detection Ð The SDM performs
diagnostic monitoring of SRS electrical components
and sets a diagnostic trouble code when a
malfunction is detected.
5. Frontal Crash Recording Ð The SDM records
information regarding SRS status during frontal
crash.
6. Malfunction Diagnosis Ð The SDM displays SRS
diagnostic trouble codes and system status
information through the use of a scan tool.
7. Driver Notification Ð The SDM warns the vehicle
driver of SRS malfunctions by controlling the ªAir
Bagº warning lamp.
The SDM is connected to the SRS wiring harness by a
24±pin connector. This harness connector uses a
shorting clip across certain terminals in the contact area.
This shorting clip connects the ªAIR BAGº warning lamp
to ground when the SDM harness connector is
disconnected or CPA (Connector Position Assurance) is
not inserted even if completely connected. This will
cause the ªAIR BAGº warning lamp to come ªONº steady
whenever the ignition switch is at the ON or START
positions with the SDM disconnected.
827RW044
Legend
(1) SDM
(2) SRS Harness
(3) Connector Position Assurance
ªAir Bagº Warning Lamp
Ignition voltage is applied to the ªAIR BAGº warning lamp
when the ignition switch is at the ON or START positions.
The SDM controls the lamp by providing ground with a
lamp driver. The ªAIR BAGº warning lamp is used in the
SRS to do the following:
1. Verify lamp and SDM operation by turn on 3.5
seconds and then turns ªOFFº when the ignition
switch is first turned ªONº.
2. Warn the vehicle driver of SRS electrical system
malfunctions which could potentially affect the
operation of the SRS. These malfunctions could
result in nondeployment in case of a frontal crash or
deployment for conditions less severe than intended.
The ªAIR BAG º warning lamp is the key to driver
notification of SRS malfunctions. For proper lamp
operation, refer to the ªSRS Diagnostic System Checkº in
this section.
821RW037
SRS Coil Assembly
The SRS coil assembly consists of two current carrying
coils. This is attached to the steering column and allow
rotation of the steering wheel while maintaining
continuous contact of the driver deployment loop to the
driver air bag assembly.
There is a shorting clip on the yellow 2±pin connector near
the base of steering column which connects the SRS coil
to the SRS wiring harness.
The shorting clip shorts to the SRS coil and driver air bag
assembly when the yellow 2±pin connector is
disconnected. The circuit to the driver air bag assembly is
shorted in this way to help prevent unwanted deployment
of the air bag when servicing the steering column or other
SRS components.

SUPPLEMENTAL RESTRAINT SYSTEM9J±7
Steering Column
The steering column absorbs energy and is designed to
compress in a frontal crash to decrease the chance of
injury to the driver.
431RW019
Knee Bolster
The knee bolsters are used to absorb energy to protect
knees and control the forward movement of the vehicle's
front seat occupants during a frontal crash, by limiting leg
movement.
740RT015
Definitions
Air Bag
An inflatable cloth cushion designed to deploy in certain
frontal crashes. It supplements the protection offered by
the seat belts by distributing the impact load more evenly
over the vehicle occupant's head and torso.
Asynchronous
Performed in a nonperiodic fashion, (i.e., no defined time
or interval).B+
Battery voltage, (B+) The voltage available at the battery
at the time of the indicated measurement. With the key
ªONº and the engine not running, the system voltage will
likely be between 12 and 12.5 volts. At idle, the voltage
may be 14 to 16 volts. The voltage could be as low as 10
volts during engine cranking.
Bulb Check
The SDM will cause the ªAIR BAGº warning lamp to turn
on 3.5 seconds and then go ªOFFº whenever the ignition
switch transitions to the ON position from any other
ignition switch position and no malfunctions are detected.
ªContinuous Monitoringº
Tests performed by the SDM on the SRS every 100
milliseconds while ªIgnition 1º voltage is in the normal
operating voltage range at the SDM.
Data Link Connector (DLC)
Formerly ªDLCº a connector which allows communication
with an external computer, such as a scan tool.
Datum Line
A base line parallel to the plane of the underbody or frame
from which all vertical measurements originate.
Deploy
To inflate the air bag.
Deployment Loops
The circuits which supply current to the air bag
assemblies to deploy the air bag.
Diagnostic Trouble Code (DTC)
Formerly ªCodeº, a numerical designator used by the
SDM to indicate specific SRS malfunctions.
Driver Current Source
An output of the SDM which applies current into the driver
air bag assembly circuit during the ªInitiator Assembly
Resistance Testº.
Driver Air Bag Assembly
An assembly located in the steering wheel hub consisting
of an inflatable bag, an inflator and an initiator.
EEPROM
Electrically Erasable Programmable Read Only Memory.
Memory which retains its contents when power is
removed from the SDM.
Ignition Cycle
The voltage at the SDM ªIgnition 1º inputs, with ignition
switch ªONº, is within the normal operating voltage range
for at least ten seconds before turning ignition switch
ªOFFº.
Ignition 1
A battery voltage (B+) circuit which is only powered with
the ignition switch in the ON, or START positions.
Initiator
The electrical component inside the air bag assembly
which, when sufficient current flows, sets off the chemical
reaction that inflates the air bag.
ªInitiator Assembly Resistance Testº
Tests performed once each ignition cycle when no
malfunctions are detected during ªTurn±ONº or
ªContinuous Monitoringº. This test checks for the correct
SDM configuration for the vehicle, shorts to ªIgnition 1º in

SUPPLEMENTAL RESTRAINT SYSTEM 9J±8
the deployment loops, high resistance or opens in the
ªDriver Side Highº, ªDriver Side Lowº, ªPassenger Side
Highº and ªPassenger Side Lowº circuits and measures
the resistance of the inflator assembly consisting of 1)
Initiators, 2) SRS coil assembly (driver side only), 3)
Connectors and associated wiring.
Normal Operating Voltage Range
The voltage measured between the SDM ªIgnition 1º
terminals and ªGroundº terminals is between 9 and 16
volts.
Passenger Current Source
An output of the SDM which applies current into the
passenger air bag assembly circuit during the ªInitiator
Assembly Resistance Testº.
Passenger Air Bag Assembly
An assembly located in the right side of the instrument
panel consisting of an inflatable bag, an inflator and an
initiator.
Scan Tool
An external computer used to read diagnostic information
from on±board computers via the data link connector.
SDM
Sensing and Diagnostic Module which provides reserve
energy to the deployment loops, deploys the air bags
when required and performs diagnostic monitoring of all
SRS components.
Serial Data
Information representing the status of the SRS.
SRS
Supplemental Restraint System.
SRS Coil Assembly
An assembly of two current±carrying coils in the driver
deployment loop that allows the rotation of the steering
wheel while maintaining the continuous contact of the
driver deployment loop to the driver air bag assembly.
SRS Wiring Harness
The wires and connectors that electrically connect the
components in the SRS.
ªTurn±ONº
Test which the SDM performs on the SRS once during
each ignition cycle immediately after ªIgnition 1º voltage
is applied to the SDM and before ªContinuous
Monitoringº.
Diagnosis
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.
Diagnostic Trouble Codes
The ªSRS Diagnostic System Checkº must always be the
starting point of any SRS diagnosis. The ªSRS
Diagnostic System Checkº checks for proper ªAIR BAGº
warning lamp operation and checks for SRS diagnostic
trouble codes using the scan tool.
1. Current diagnostic trouble codes ± Malfunctions that
are presently being detected. Current diagnostic
trouble codes are stored in RAM (Random Access
Memory).
2. History diagnostic trouble codes ± All malfunctions
detected since the last time the history memory was
cleared. History diagnostic trouble codes are stored
in EEPROM.
Scan Tool Diagnostics
A scan tool is used to read current and history diagnostic
trouble codes and to clear all diagnostic trouble codes
after a repair is completed. The scan tool must be
updated to communicate with the SRS through a
replaceable cartridge before it can be used for SRS
diagnostics. To use the scan tool, connect it to the data
link connector and turn the ignition switch ªONº. The scan
tool reads serial data from the SDM ªSerial Dataº line
terminal ª24º to the data link connector terminal ª9º.
Use Of 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 NON
POWERED PROBE±TYPE TESTER. INSTRUCTIONS
IN THIS MANUAL MUST BE FOLLOWED
CAREFULLY, OTHERWISE PERSONAL INJURY MAY
RESULT. YOU SHOULD BE FAMILIAR WITH THE
TOOLS LISTED IN THIS SECTION UNDER THE
HANDLING SRS SPECIAL TOOLS.
You should be able to measure voltage and resistance.
You should be familiar with proper use of a scan tool such
as the Tech 2 Diagnostic Computer, SRS
Driver/Passenger Load Tool 5±8840±2421±0, Connector
Test Adapter Kit 5±8840±0385±0, and the DVM (Digital
Multimeter) 5±8840±0285±0.