Isuzu KB P190. Manual — part 1414

SUPPLEMENTAL RESTRAINT SYSTEM 9A-21

On–Vehicle Service

Service Precaution

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 UNNECESSARY SRS
REPAIRS.

The SRS control unit in Driver–Passenger SRS can
maintain sufficient voltage to cause a deployment for
up to 15 seconds after the ignition switch is turned
“OFF,” the battery is disconnected, or the fuse
powering the SRS control unit is removed.

Many of the service procedures require removal of the
“SRS” 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 “Disabling
the SRS” 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 “LOCK” and remove the
key.

1. Remove the SRS fuse “SRS”, from the side of the

driver’s side of the instrument panel fuse block or
disconnect the battery.

2. Disconnect the yellow connector at the base of the

steering column.

3.

Remove the glove box assembly, refer to
“Passenger Air Bag Assembly Replacement” in
this manual.

4. Disconnect the yellow connector behind the glove

box assembly.

CAUTION: With the “SRS” fuse removed and
ignition switched “ON”, the “SRS” warning lamp
will be “ON”. This is normal operation and does
not indicate an SRS malfunction.

Enabling The SRS

Installation

CAUTION: Never use the air bag assembly from
another vehicle or different model year air bag
assembly.

Use only a new air bag assembly matched to the
TFR/S which is being repaired.

Turn the ignition switch to “LOCK” and remove the
key.

1. Connect the yellow connector passenger air bag

assembly.

2.

Install the glove box assembly. Refer to
“Passenger air bag assembly replacement” in this
manual.

3. Connect the yellow connector at the base of the

steering column.

4. Install the “AIR BAG” fuse “SRS” to the side of the

driver’s side of the instrument panel fuse block or
connect the battery.

Turn the ignition switch to “ON” and verify that the
“SRS” warning lamp flashes seven times and then
turns to “LOCK”. If it does not operate as described,
perform the “SRS Diagnostic System Check” in this
manual.

Handling / Installation / Diagnosis

1. The air bag assembly should not be subjected to

temperatures above 65

°

C (150

°

F).

2. The air bag assembly, and SRS control unit,

should not be used if they have been dropped from
a height of 100 centimeters (3.28 feet) or more.

3. When the SRS control unit is replaced, it must be

oriented with the arrow on the sensor pointing
toward the front of the vehicle. It is very important
for the SRS control unit to be located flat on the
mounting surface, parallel to the vehicle datum
line. It is important that the SRS control unit
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 “SRS Diagnostic System Check” must be the

starting point of any SRS diagnostics. The “SRS
Diagnostic System Check” will verify proper “SRS”
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 replacement.

9A-22 SUPPLEMENTAL RESTRAINT SYSTEM

Air Bag Assembly Handling /

Shipping / Scrapping

Live (Undeployed) Air Bag Assembly

Special care is necessary when handling and storing a
live (undeployed) air bag assembly. The rapid gas
generation produced during deployment of the air bag
could cause the air bag assembly, or an object in front
of the air bag assembly, to be thrown through the air in
the unlikely event of an accidental deployment.

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WARNING: WHEN CARRYING A LIVE AIR BAG
ASSEMBLY, MAKE SURE THE BAG OPENING IS
POINTED AWAY FROM YOU. IN CASE OF AN
ACCIDENTAL DEPLOYMENT, THE BAG WILL
THEN DEPLOY WITH MINIMAL CHANCE OF
INJURY. NEVER CARRY THE AIR BAG ASSEMBLY
BY THE WIRES OR CONNECTOR ON THE
UNDERSIDE OF THE MODULE.

827RS044

Air Bag Assembly Shipping Procedure
For Live (Undeployed) Air Bag
Assemblies

Service personnel should refer to the latest Service
Bulletins for proper SRS air bag assembly shipping
procedures.

Deployed Air Bag Assembly (Driver Side)

You should wear gloves and safety glasses. After the
air bag assembly has been deployed, the surface of
the air bag may contain a powdery residue. This
powder consists primarily of cornstarch (used to
lubricate the bag as it inflates) and by-products of the
chemical reaction. Sodium hydroxide dust (similar to
lye soap) is produced as a by-product of the
deployment reaction. The sodium hydroxide then
quickly reacts with atmospheric moisture and is
converted to sodium carbonate and sodium
bicarbonate (baking soda). Therefore, it is unlikely that
sodium hydroxide will be present.

SUPPLEMENTAL RESTRAINT SYSTEM 9A-23

Air Bag Assembly Scrapping Procedure

During the course of a vehicle's useful life, certain
situations may arise which will necessitate the disposal
of a live (undeployed) air bag assembly. This
information covers proper procedures for disposing of
a live air bag assembly.

Before a live air bag assembly can be disposed of, it
must be deployed. A live air bag assembly must not
be disposed of through normal refuse channels.

WARNING: FAILURE TO FOLLOW PROPER
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) AIR
BAG ASSEMBLY DISPOSAL PROCEDURES CAN
RESULT IN AIR BAG DEPLOYMENT WHICH MAY
CAUSE PERSONAL INJURY. AN UNDEPLOYED
AIR BAG ASSEMBLY MUST NOT BE DISPOSED
OF THROUGH NORMAL REFUSE CHANNELS.
THE UNDEPLOYED AIR BAG ASSEMBLY
CONTAINS SUBSTANCES THAT CAN CAUSE
SEVERE ILLNESS OR PERSONAL INJURY IF THE
SEALED CONTAINER IS DAMAGED DURING
DISPOSAL. DISPOSAL IN ANY MANNER
INCONSISTENT WITH PROPER PROCEDURES
MAY BE A VIOLATION OF FEDERAL, STATE, AND /
OR LOCAL LAW.

In situations which require deployment of a live air bag
assembly, deployment may be accomplished inside or
outside the vehicle. The method employed depends
upon the final disposition of the particular vehicle, as
noted in “Deployment Outside Vehicle” and
“Deployment Inside Vehicle” in this section.

Deployment Outside Vehicle (Driver Air
Bag Assembly)

Deployment outside the vehicle is proper when the
vehicle is to be returned to service. This includes, for
example, situations in which the vehicle will be
returned to useful service after a functionally or
cosmetically deficient air bag assembly is replaced.
Deployment and disposal of a malfunctioning air bag
assembly is, of course, subject to any required
retention period.

For deployment of a live (undeployed) air bag
assembly outside the vehicle, the deployment
procedure must be followed exactly. Always wear
safety glasses during this deployment procedure until
a deployed air bag assembly is scrapped or until an
undeployed air bag assembly is shipped. Before
performing the procedures you should be familiar with
servicing the SRS and with proper handling of the air
bag assembly. Procedures should be read fully before
they are performed.

The following procedure requires use of a 5-8840-
2468-06 SRS deployment harness with appropriate
pigtail adapter. Do not attempt the procedure without
a 5-8840-2468-0 adapter.

WARNING: FAILURE TO FOLLOW PROCEDURES
IN THE ORDER LISTED MAY RESULT IN
PERSONAL INJURY. NEVER CONNECT THE
DEPLOYMENT HARNESS TO ANY POWER
SOURCE BEFORE CONNECTING THE
DEPLOYMENT HARNESS TO THE DRIVER AIR
BAG ASSEMBLY. DEPLOYMENT HARNESS
SHALL REMAIN SHORTED AND NOT BE
CONNECTED TO A POWER SOURCE UNTIL THE
AIR BAG IS TO BE DEPLOYED. THE AIR BAG
ASSEMBLY WILL IMMEDIATELY DEPLOY THE AIR
BAG WHEN A POWER SOURCE IS CONNECTED
TO IT. WEAR SAFETY GLASSES THROUGHOUT
THIS ENTIRE DEPLOYMENT AND DISPOSAL
PROCEDURE.

NOTE: This information applies only to driver air bag
assembly. Refer to “Deployment Outside Vehicle
(Passenger Air Bag assembly)” in this section for
information on passenger air bag assembly scrapping.

1. Turn the ignition switch to “LOCK”, remove the key

and put on safety glasses.

2.

Inspect the 5-8840-2468-0 SRS Deployment
Harness and appropriate pigtail adapter for
damage. If the harness or pigtail adapter is
damaged, discard and obtain a replacement.

3. Short the two SRS deployment harness leads

together by fully seating one banana plug into the
other. The SRS deployment harness shall remain
shorted and not be connected to a power source
until the air bag is to be deployed.

827RS004

4. Connect the appropriate pigtail adapter to the SRS

deployment harness.

5. Remove the driver air bag assembly from the

vehicle. Refer to “Inflator Module Removal” in this
manual.

9A-24 SUPPLEMENTAL RESTRAINT SYSTEM

WARNING: WHEN STORING A LIVE AIR BAG
ASSEMBLY OR WHEN LEAVING A LIVE AIR BAG
ASSEMBLY UNATTENDED ON A BENCH OR
OTHER SURFACE, ALWAYS FACE THE AIR BAG
AND TRIM COVER UP AND AWAY FROM THE
SURFACE. THIS IS NECESSARY SO THAT A FREE
SPACE IS PROVIDED TO ALLOW THE AIR BAG TO
EXPAND IN THE UNLIKELY EVENT OF
ACCIDENTAL DEPLOYMENT. FAILURE TO
FOLLOW PROCEDURES MAY RESULT IN
PERSONAL INJURY.

6. Place the driver air bag assembly on a work bench

or other surface away from all loose or flammable
objects with its trim cover facing up, away from the
surface.

RTW79ASH001101

7. Clear a space on the ground about 183 cm (six

feet) in diameter where the driver air bag assembly
is to be deployed. A paved, outdoor location
where there is no activity is preferred. If an
outdoor location is not available, a space on the
shop floor where there is no activity and there is
sufficient ventilation is recommended. Ensure no
loose or flammable objects are within the
deployment area.

RTW79ASH001201

8. Place the driver air bag assembly, with its trim

cover facing up, on the ground in the space just
cleared.

9. Stretch the SRS deployment harness and pigtail

adapter from the driver air bag assembly to its full
length.

10. Place a power source near the shorted end of the

SRS deployment harness. Recommended
application: 12 volts minimum, 2 amps minimum.
A vehicle battery is suggested.

11. Connect the driver air bag assembly to the pigtail

adapter on the SRS deployment harness. The
deployment harness shall remain shorted and not
be connected to a power source until the air bag is
to be deployed. The driver air bag assembly will
immediately deploy the air bag when a power
source is connected to it.

NOTE: Ensure that the pigtail adapter is firmly seated
into the driver air bag assembly connector. Failure to
fully seat the connectors may leave the shorting bar
located in the driver air bag assembly connector
functioning (shorted) and may result in no deployment
of the driver air bag assembly.

12. Verify that the area around the driver air bag

assembly is clear of all people and loose or
flammable objects.

13. Verify that the driver air bag assembly is resting

with its trim cover facing up.

14. Notify all people in the immediate area that you

intend to deploy the driver air bag. The
deployment will be accompanied by a substantial
noise which may startle the uninformed.

15.

Separate the two banana plugs on the SRS
deployment harness.