Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1697

SUPPLEMENTAL RESTRAINT SYSTEM

9J–45

Main Data and Specifications

Fastener Tightening Specification

Application

N·m

kg·m

Ib Ft

Ib In

SDM

10

1.0

—

87

Driver air bag fixing bolt

8.8

0.9

—

78

Steering wheel fixing bolt

34

3.5

25

—

Steering column (dash panel side fixing bolts)

20

2.0

15

—

Steering column (Cross beam side fixing nuts)

17

1.7

13

—

Steering column (Universal joint fixing bolt)

31

3.2

23

—

Passenger Air Bag fixing bolts and nuts

6

0.6

—

52

SUPPLEMENTAL RESTRAINT SYSTEM

9J–46

SRS Air Bag System Inspection
Standards For Repair

Parts Name

Inspection

Standard

Part

Replacem

ent

Collision

ent

Standard

Trouble

Driver Air bag As-
sembly

f

f

1. Air bag has deployed due to collision.
2. Pad surface has crack or scratch.
3. Connector has cracks.
4. Harness is disconnected or scratched.

Passenger Air bag
Assembly

f

f

5. Air bag is soaked in water, oil etc.
6. Air bag has fallen from a height of about 10 cm (3.3) feet.
7. Trouble diagnosis in Workshop Manual resulted in part

replacement.

Sensing and
Diagnostic Module
(SDM)

f

f

1. Air bag has deployed due to collision.
2. SDM is crack or deformed.
3. Connector has cracks.
4. SDM has fallen from a height of about 100 cm (3.3 feet).
5. Trouble diagnosis in Workshop Manual resulted in part

replacement.

SRS Coil
Assembly

f

f

1. Burn or melt due to overheat.
2. Case is cracked or deformed.
3. Trouble diagnosis in Workshop Manual resulted in part

replacement.

SRS Harness

f

f

1. Air bag circuit wire harness is disconnected or damaged.
2. Connector has cracks.
3. Trouble diagnosis in Workshop Manual resulted in part

replacement.

Steering Wheel

f

1. Bracket is deformed.
2. A new air bag cannot be installed with ease.
3. When a new air bag is installed, pad interferes with the steering

wheel, and clearance is uneven.

Steering Column

f

1. Capsule is broken.
2. The fitting of column collapses.
3. Bellows pipe is deformed.

Instrument Panel &
Knee bolster &
Cover Glove box.
Seat Seat Belt
Wood shield Glass

f

1. Dent, bend, cracks, and deform.

Mounts

f

1. Repair or replace if dent, bend, cracks, and deform are found.
2. Retighten to specified torque if loose.

Inspection Standards
In cases of collision: When any type of collision has
occurred regardless of air bag deployment.
In cases of trouble code: When trouble code has been
detected by TECH 2 in case of the AIR BAG WARNING
LIGHT failing to work or remaining lighted.

9J1–1

RESTRAINT CONTROL SYSTEM

RODEO

RESTRAINTS

SRS CONTROL SYSTEM

CONTENTS

Service Precaution

9J1–1

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

Diagnostic Information

9J1–2

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

Plotting Snapshot Graph

9J1–7

. . . . . . . . . . . . . . . . . 

Parts For Electrical Circuit

9J1–10

. . . . . . . . . . . . . . . . 

System Schematic

9J1–11

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

SRS Diagnostic System Check

9J1–11

. . . . . . . . . . . . 

Chart A  SDM Integrity Check

9J1–14

. . . . . . . . . . . . . 

Chart B “AIR BAG” Warning Lamp Comes
 “ON” Steady

9J1–16

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

Chart C  “AIR BAG” Warning Lamp Does
 Not Comes “ON” Steady

9J1–18

. . . . . . . . . . . . . . . . . 

DTC 15  Passenger Deployment Loop
 Resistance High

9J1–21

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

DTC 16  Passenger Deployment Loop
 Resistance Low

9J1–24

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

DTC 17  Passenger Deployment Loop
 Open

9J1–27

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

DTC 18  Passenger Deployment Loop Short
 To Ground

9J1–29

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

DTC 19  Passenger Deployment Loop Short
 To Voltage

9J1–31

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

DTC 21  Driver Deployment Loop Resistance
 High

9J1–33

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

DTC 22  Driver Deployment Loop Resistance
 Low

9J1–36

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

DTC 24  Driver Deployment Loop Short
 To Ground

9J1–39

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

DTC 25  Driver Deployment Loop Short
 To Voltage

9J1–41

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

DTC 26  Driver Deployment Loop Open

9J1–44

. . . . 

DTC 51  Deployment Event Commanded

9J1–47

. . . 

DTC 53  Deployment Commanded With
 Deployment Loop Fault Or Energy Reserves
 Out Of Range

9J1–49

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

DTC 61  Warning Lamp Circuit Failure

9J1–51

. . . . . 

DTC 71  Internal SDM Fault

9J1–53

. . . . . . . . . . . . . . 

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

RESTRAINT CONTROL SYSTEM

9J1–2

Diagnostic Information

Diagnostic Procedures

WARNING: WHEN FASTENERS ARE REMOVED,
ALWAYS REINSTALL THEN 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: TO AVOID DEPLOYMENT WHEN
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.

The diagnostic procedures used in this section are
designed to aid in finding and repairing SRS problems.
Outlined below are the steps to find and repair SRS
problems quickly and effectively.  Failure to carefully
follow these procedures may result  in extended
diagnostic time, incorrect diagnosis and incorrect parts
Replacement.

1. Perform The “SRS Diagnostic System Check.”

The “Supplemental Restraint System (SRS) Diagnostic
System Check” should always be the starting point of any
SRS diagnostics.  The “SRS Diagnostic System  Check”
checks for proper “AIR BAG” warning lamp operation and
checks for SRS trouble codes using both “Flash Code”
and  “Scan Tool” Methods.

2. Refer To The Proper Diagnostic Chart As Directed

By The “SRS Diagnostic System Check.”

The “SRS Diagnostic System Check” will lead you to the
correct chart to diagnose any SRS problems.  Bypassing
these procedures  may result in extended diagnostic time,
incorrect diagnosis and incorrect parts Replacement.

3. Repeat the “SRS Diagnostic System Check” After

Any Repair Or Diagnostic Procedures Have Been
Performed.

Performing the “SRS Diagnostic System Check” after all
repair or diagnostic procedures will assure that the repair
has been  made correctly and that no other conditions
exist.

Diagnostic Codes

The Sensing and Diagnostic Module (SDM) maintains a
history record of all diagnostic codes that have been
detected since the SRS codes were last cleared during
service.

1. Active Codes—Faults that are presently detected this

ignition cycle.  Active codes are stored in Random
Access Memory (RAM).

2. History Codes—All faults detected since the last time

the history fault memory was cleared.  History codes
are stored in Electronically Erasable Programmable
Read only Memory (EEPROM).

How To Read Trouble Codes

All codes (Active and history) can be read (or cleared) by
using a scan tool or equivalent.
If a Diagnostic Trouble Code (DTC) is not available, have
the vehicle serviced by dealer.

How To Clear Trouble Codes

Trouble codes can only be cleared by using a scan tool.  If
a scan tool is not available then inform the owner of the
stored codes and suggest that the codes are cleared
upon the next visit to a dealership.

Scan Tool Diagnostics

A scan tool can be used to read current and history codes
and to clear all history codes after a repair is complete.
The scan tool must be updated to communicate with the
SRS through a replaceable cartridge for SRS
diagnostics.  To use the scan tool, connect it to the Data
Link Connector (DLC) and turn the ignition switch “ON”.
Then follow the manufacturer’s directions for
communication with the SRS.  The scan tool reads serial
data from the Sensing and Diagnostic Module (SDM)
“Serial Data” output (terminal 24) to the DLC.

Basic Knowledge Required

Before using this section of the Service Manual, there is
some basic knowledge which will be required.  Without
this knowledge, you will have trouble using the diagnostic
procedures  in this section.  Use care to prevent harm or
unwanted deployment.  Read all cautions in the service
manual and on warning labels attached to SRS
components.

Basic Electrical Circuits

You should understand the basic theory of electricity
including series and parallel circuits, and understand the
voltage drops across series resistors.  You should know
the meaning of voltage (volts), current (amps), and
resistance (ohms).  You should understand what happens
in a circuit with an open or a shorted wire.  You should be
able to read and understand a wiring diagram.