Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1686

SUPPLEMENTAL RESTRAINT SYSTEM

9J–1

RODEO

RESTRAINTS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

CONTENTS

Service Precaution

9J–1

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General Description

9J–2

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SRS Component and Wiring Location View

9J–4

Component Description

9J–4

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Definition

9J–7

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Diagnosis

9J–8

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SRS Connector Body Face Views

9J–9

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Repairs and Inspections Required After
 an Accident

9J–9

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On–Vehicle Service

9J–10

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Air Bag Assembly Handling / Shipping /
 Scrapping

9J–11

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Special Tools

9J–26

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Service Precaution

9J–28

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Sensing and Diagnostic Module (SDM)

9J–30

. . . . 

Service Precautions

9J–30

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Removal

9J–30

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Installation

9J–31

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Driver Air Bag Assembly

9J–32

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Service Precautions

9J–32

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Removal

9J–32

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Installation

9J–32

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Steering Wheel

9J–33

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Service Precautions

9J–33

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Removal

9J–33

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Installation

9J–34

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SRS Coil Assembly

9J–35

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Service Precaution

9J–35

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Removal

9J–35

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How to Disconnect the horn terminal

9J–37

. . . . . 

How to Connect  Horn Terminal

9J–37

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Installation

9J–38

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Steering Column

9J–40

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Service Precaution

9J–40

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Removal

9J–40

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

9J–42

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Passenger Air Bag Assembly

9J–44

. . . . . . . . . . . . . 

Service Precaution

9J–44

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Removal

9J–44

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Installation

9J–44

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Main Data and Specifications

9J–45

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SRS Air Bag System Inspection Standards
 For Repair

9J–46

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Service Precaution

WARNING: THIS VEHICLE HAS 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.

SECTION

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

827RS035

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.

827RX050

SUPPLEMENTAL RESTRAINT SYSTEM

9J–3

System Description

The SRS consists of the Sensing and Diagnostic Module
(SDM), the driver air bag assembly, the SRS coil
assembly, the passenger air bag assembly, and the “AIR
BAG“ warning lamp in the instrument cluster.   The SDM,
SRS coil assembly (driver side only), driver air bag
assembly, passenger air bag assembly and connector
wire make up the deployment loops.  The function of the
deployment loops is to supply current through air bag
assembly, which will cause deployment of the air bags in
the event of a frontal crash of sufficient force, up to 30

degrees off the centerline of the vehicle.  The air bag
assemblies are only supplied enough current to deploy
when the SDM detects vehicle velocity changes severe
enough to warrant deployment.
The SDM contains a sensing device which converts
vehicle velocity change to an electrical signal.   The
electrical signal generated is processed by the SDM and
then compared to a value stored in memory.   When the
generated signal exceeds the stored value, the SDM will
cause current to flow through the air bag assembly
deploying the air bags.

D09R100002

SUPPLEMENTAL RESTRAINT SYSTEM

9J–4

SRS Component and Wiring Location
View

810RW003

Legend

(1) Battery
(2) Relay & Fuse Box
(3) Passenger Air Bag Assembly
(4) SDM
(5) Meter Assembly
(6) SRS Coil Assembly
(7) Driver Air Bag Assembly
(8) Starter Switch
(9) Fuse Box, SRS, METER

Component Description

SDM (Sensing and Diagnostic Module)

WARNING: DURING SERVICE PROCEDURES, BE
VERY CAREFUL WHEN HANDLING A SDM.   NEVER
STRIKE OR JAR THE SDM.  NEVER POWER UP THE
SRS WHEN THE SDM IS NOT RIGIDLY ATTACHED TO
THE VEHICLE.   ALL SDM AND MOUNTING
BRACKET FASTENERS MUST BE CAREFULLY
TORQUED AND THE ARROW MUST BE POINTED
TOWARD THE FRONT OF THE VEHICLE TO ENSURE
PROPER OPERATION OF THE SRS.  THE SDM
COULD BE ACTIVATED WHEN POWERED WHILE
NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH
COULD CAUSE DEPLOYMENT AND RESULT IN
PERSONAL INJURY.

The SDM is designed to perform the following functions in
the Supplemental Restraint System (SRS):

1. Energy Reserve — 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 — The SDM monitors

vehicle velocity changes to detect frontal crashes
which are severe enough to warrant deployment.

3. Air Bag Deployment — 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 — The SDM performs

diagnostic monitoring of SRS electrical components
and sets a diagnostic trouble code when a
malfunction is detected.

5. Frontal Crash Recording — The SDM records

information regarding SRS status during frontal
crash.

6. Malfunction Diagnosis — The SDM displays SRS

diagnostic trouble codes and system status
information through the use of a scan tool.

7. Driver Notification — The SDM warns the vehicle

driver of SRS malfunctions by controlling the “Air
Bag” warning lamp.