fuse ISUZU TROOPER 1995 Workshop Manual
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Page 1637 of 1928
Supplemental Restraint System 9J-13
ON-VEHICLE SERVICE
SERVICE PRECAUTIONS
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 DERM in Driver-Passenger SRS can maintain
sufficient voltage to cause a deployment for up to 2
minutes after the ignition switch is turned
"OFF," the
battery is disconnected, or the fuse powering the DERM
is removed.
Many of the service procedures require removal of the
"AIR BAG" fuse, and disconnection of the inflator
modules from the deployment loop to avoid an accidental
deployment.
If the inflator module is disconnected from
the deployment loop as noted in the "Disabling the
SRS"
procedure that follows, service can begin immediately
without waiting for the 2-minute time period to expire.
DISABLING THE SRS
REMOVAL
Turn the ignition switch to "OFF"
1. Remove SRS fuse C-21, C-22, C-23 and C-24 from
left dash side lower fuse block.
2. Disconnect yellow 3-way connector at the base of
steering column.
3. Remove 1/P compartment door assembly, Refer to
"Passenger inflator module replacement" in section
9J-132.
4. Disconnect yellow 4-way connector behind the 1/P
compartment door assembly.
IMPORTANT
• With the "AIR BAG" fuse removed and ignition switch
"ON," if Fuse 21 left. the "AIR BAG" warning lamp will
be "ON." This is normal operation and does not
indicate an
SRS malfunction.
ENABLING THE SRS
INSTALLATION
Turn ignition switch to "LOCK" and remove key.
1. Connect yellow 4-way connector for passenger
inflator module.
2. 1/P compartment door assembly, Refer to
"Passenger inflator module replacemenf' in section
9J-3.
3. Connect yellow 2-way connector at the base of the
steering column.
4. Install "AIR BAG" fuse C-21, C-22, C-23 and C-24 to
left dash side lower fuse block.
Turn ignition switch to
"RUN" and verify that the "AIR
BAG"
warning lamp flashes seven times and then turns
"OFP' If it does not operate as described, perform the
"SRS Diagnostic System Check" in section 9J-2.
HANDLING/INSTALLATION/DIAGNOSIS
1. Inflator modules should not be subjected to
temperatures above
65°C{150°F).
2. Discriminating sensors, inflator modules, arming
sensors, or DERMs should not be used if they have
been dropped from a height
of 91.4 centimeters
{3feet).
3. When a discriminating sensor or arming sensor 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 discriminating sensors and
arming sensor to be located flat on the mounting
surface, parallel to the vehicle datum line.
It is
important that the sensor 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 "AIR
BAG"
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.
Page 1639 of 1928
INFLATOR
PROCEDURE
MODULE
SCRAPPING
'-""' During the course of a vehicle's useful life, certain
situations may arise which
will necessitate the disposal
of a live (undeployed) inflator module. This information
covers proper procedures for disposing of a
live inflator
module.
Before a live inflator module can be disposed of, it must
be
deployed. Live inflator modules must not be disposed
of through
normal refuse channels.
WARNING: FAILURE TO FOLLOW PROPER
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
INFLATOR MODULE DISPOSAL PROCEDURES
CAN RESULT IN AIR BAG DEPLOYMENT WHICH
MAY CAUSE PERSONAL INJURY. UNDEPLOYED
INFLATOR MODULES MUST NOT
BE DISPOSED OF
THROUGH
NORMAL REFUSE CHANNELS. THE
UNDEPLOYED INFLATOR MODULE 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 inflator
module, 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.
Supplemental Restraint System 9J-15
Page 1642 of 1928
9J-18 Supplemental Restraint System
NOTE: Ensure that the pigtail adapter is firmly seated
into the driver inflator module connector. Failure to fully
seat the connectors may leave the shorting bar located
in the
driver inflator module connector functioning
(shorted) and may result
in non-deployment of the driver
inflator module.
12. Verify that the area around the driver inflator module
is clear of all people and loose or flammable objects.
13. Verify that the driver inflator module is resting with its
trim cover facing up.
14. Notify all people
in the immediate area that you
intend to deploy the driver inflator module. The
deployment will be accompanied by a loud noise
which may startle the uninformed.
15.
Separate the two banana plugs on the SRS
deployment harness.
NOTE: When the air bag deploys, the driver inflator
module may jump about
30 em (one foot) vertically. This
is a normal reaction of the driver inflator module to the
force of the rapid gas expansion inside the air bag.
NOTE: When the air bag deploys, the rapid gas
expansion will create a loud noise. Notify all people
in the
immediate area that you intend to deploy the driver
inflator module.
16. Connect the
SRS deployment harness wires to the
power source to immediately deploy the driver
inflator module. Recommended application: 12 volts
minimum, 2 amps minimum. A vehicle battery is
suggested.
17. Disconnect the
SRS deployment harness from the
power source.
18.
Short the two SRS deployment harness leads
together by fully seating one banana plug into the
other.
19.
In the unlikely event that the driver inflator module did
not deploy after following these procedures, proceed
immediately with
Steps 24 through 27. If the driver
inflator module did deploy, proceed with
Steps 20
through 23.
20. Put on a pair of shop gloves to protect your hands
from possible irritation and heat when handling the
deployed driver inflator module.After the driver
inflator module has been deployed, the surface of the
air bag may contain a powdery residue. This power
consists primarily of cornstarch(used to lubricate the
bag as it inflates) and byproducts of the chemical
reaction.
Sodium hydroxide dust( similar to lye soap)
is produced as a byproduct
of the deployment
reaction.The sodium hydroxide then quickly reacts
with the atmospheric moisture and is converted to
sodium carbonate and sodium bicarbonate(baking
soda). Therefore, it is unlikely that sodium hydroxide
will be present after deployment. As a precaution,
however, gloves and safely glasses are
recommended to prevent any possible irritation of
the skin or eyes.
WARNING: SAFETY PRECAUTIONS MUST BE
OBSERVED WHEN
HANDING A DEPLOYED
INFLATOR MODULE. AFTER DEPLOYMENT, THE ~
METAL SURFACES OF THE INFLATOR MODULE
WILL BE VERY HOT. ALLOW THE INFLATOR
MODULE TO COOL BEFORE HANDLING ANY
METAL PORTION OF IT. DO NOT PLACE THE
DEPLOYED
INFLATOR MODULE NEAR ANY
FLAMMABLE OBJECTS.
FAILURE TO FOLLOW
PROCEDURES MAY RESULT
IN FIRE OR
PERSONAL INJURY.
After a driver inflator module has been deployed, the
metal canister and surrounding areas
of the driver
inflator module will
be very hot. Do not touch the metal
areas of the driver inflator module for about twenty
minutes after deployment.
If the deployed driver inflator
module must
be moved before it is cool, wear gloves and
handle by the air bag or trim cover.
21. Disconnect the pigtail adapter from the driver inflator
module 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 driver inflator module canister. The pigtail can be
reused. They should, however, be inspected for
damage after each deployment and replaced if
necessary.
22. Dispose of the deployed driver inflator module
through normal refuse channels after it has cooled
for at least
20 minutes. ~
23. Wash your hands with mild soap and water
afterward.
NOTE: The remaining steps are to be followed in the
unlikely event that the driver inflator module did not
deploy after following these procedures.
24. 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.
25. Disconnect the pigtail
adapter from the driver inflator
module.
WARNING: WHEN STORING A LIVE INFLATOR
MODULE OR WHEN LEAVING A LIVE INFLATOR
MODULE UNATTENDED ON A BENCH OR OTHER
SURFACE, ALWAYS FACE THE BAG AND
TRIM
COVER
UP AND AWAY FROM THE SURFACE. THIS
IS
NECESSARY SO THAT A FREE SPACE
ISRPROVIDED TO ALLOW THE AIR BAG TO
EXPAND IN THE UNLIKELY EVENT OF ACCIDENTAL
DEPLOYMENT. FAILURE TO FOLLOW
PROCEDURES MAY RESULT IN PERSONAL
INJURY.
•
Page 1643 of 1928
~ Supplemental Restraint System 9J-19
26. Temporarily store the driver inflator module with its inflator module can be found in the applicable service
vinyl trim cover facing
up, away from the surface manual or in a service bulletin.
upon which is rests.
27.
Call the Technical Assistance group for further
assistance.
DEPLOYMENT OUTSIDE VEHICLE
(PASSENGER INFLATOR MODULE)
WARNING: FAILURE TO FOLLOW PROPER SRS
INFLATOR MODULE DISPOSAL PROCEDURES
CAN RESULT IN AIR BAG DEPLOYMENT WHICH
MAY CAUSE PERSONAL INJURY. UNDEPLOYED
INFLATOR MODULES MUST NOT BE DISPOSED OF
THROUGH NORMAL REFUSE CHANNELS. THE
UNDEPLOYED INFLATOR MODULE 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 LOCALLAWS.
Deployment out of the vehicle is proper when the vehicle
is to be returned to service. This includes, for example,
situations
in which a functionally or cosmetically deficient
inflator module
is replaced. Deployment and disposal of
an inflator module is, of course, subject to any required
reterntion period.
For deployment
of a live inflator module out of the
·'-" vehicle, the deployment procedure must be followed
exactly.
ALWAYS wear safety glasses during this
deployment procedure until the deployed inflator module
is scrapped. Before performing the procedures you
should
be familiar with servicing the SRS system and
with proper handling of the inflator module. Procedures
should be read fully before they are performed.
The following procedure requires use of J-41434
SIR
Deployment Harness with the appropriate pigtail
adapter. The procedure also requires the use of J-41497
Passenger
Side SRS Module Deployment Fixture. Do
not attempt this procedure without J-41434 and adapter,
and J-41497.
WARNING: FAILURE TO FOLLOW PROCEDURES
IN THE ORDER LISTED MAY RESULT IN PERSONAL
INJURY.
NEVER CONNECT DEPLOYMENT
HARNESS TO ANY POWER SOURCE BEFORE
CONNECTING DEPLOYMENT HARNESS TO THE
INFLATOR MODULE. DEPLOYMENT HARNESS
SHALL REMAIN SHORTED AND NOT BE
CONNECTED TO A POWER SOURCE UNTIL THE
AIRBAG IS TO BE DEPLOYED. THE INFLATOR
MODULE WILL IMMEDIATELY DEPLOY THE
AIRBAG WHEN A POWER SOURCE IS CONNECTED
TO IT. WEAR SAFETY GLASSES THROUGHOUT
THIS ENTIRE DEPLOYMENT AND DISPOSAL
~ PROCEDURE.
NOTE: This information applies only to passenger
inflator modules. Information for disposing of a live driver
1. Turn ignition switch to "LOCK", remove key, and put
on safety glasses.
2. Inspect J-41434 SRS Deployment Harness and
appropriate pigtail adapter for damage.
If harness or
pigtail is damaged, discard and obtain a
replacement.
Page 1645 of 1928
WARNING: ENSURE THAT THE PIGTAIL ADAPTOR
IS FIRMLY SEATED INTO THE INFLATOR MODULE
CONNECTOR. FAILURE TO FULLY SEAT THE
CONNECTORS MAY LEAVE THE SHORTING BAR
LOCATED IN THE INFLATOR MODULE
CONNECTOR FUNCTIONING (SHORTING THE
DEPLOYMENT CIRCUIT) AND MAY RESULT IN
NONDEPLOYMENT OF THE INFLATOR MODULE.
12.
Verify that the area around the inflator module is clear
of all people and loose or flammable objects.
13.
Verify that the inflator module is firmly and properly
in J-41497.
14. Notify
all people in the immediate area of your
intention to deploy the inflator module. 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 that were shorted together in
Step 3.
NOTE: When air bag depolys, the rapid gas
expansion will create a substantial noise. Notify all
people in the immediate area that you intend to deploy
the inflator module.
WARNING: DEPLOYMENT HARNESS SHELL
REMAIN SHORTED AND NOT BE CONNECTED TO A
POWER SOURCE UNTIL THE AIR BAG IN TO BE
DEPLOYED. THE INFLATOR MODULE WILL
IMMEDIATELY DEPLOY THE AIR BAG WHEN A
POWER SOURCE IS CONNECTED TO IT.
CONNECTING
THE DEPLOYMENT HARNESS TO
THE POWER SOURCE SHOULD ALWAYS BE THE
LAST STEP IN THE INFLATOR MODULE
DEPLOYMENT PROCEDURE. FAILURE TO
FOLLOW PROCEDURES IN THE ORDER LISTED
MAY RESULT IN PERSONAL INJURY.
16. Connect the SRS Deployment Harness wires to the
power source to immediately deploy the inflator
module.
17. Disconnect the
SRS Deployment Harness from the
power source.
18.
Short the two SRS Deployment Harness leads
together by fully seating one banana plug into the
other.
19.
In the unlikely event that the inflator module did not
deploy after following these procedures, proceed
immediately with
Steps 24 through 27. If the inflator
module deployed
as intended, proceed with Steps 20
through 23.
20. Put on a pair of shop gloves to protect your hands
from possible irritation and heat when handling the
deployed inflator module. After the inflator module
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 byproducts of the chemical reaction.
Supplemental Restraint System 9J-21
Sodium hydroxide dust (similar to lye soap) is
produced as a byproduct of the deployment reaction.
The sodium hydroxide quickly reacts with the
atmospheric moisture and is convertered to sodium
carbonate and sodium bicarbonate (baking soda).
Therefore, it is unlikely that sodium hydroxide will
be
present for very long after deplyment. As a
precaution, however, gloves and safety glasses are
recommended to prevent any possible irritation of
the skin or eyes.
WARNING: SAFETY PRECAUTIONS MUST BE
OBSERVED WHEN HANDLING A DEPLOYED
INFLATOR MODULE. AFTER DEPLOYMENT, THE
METAL
SURFACES OF THE INFLATOR MODULE
WILL BE HOT. ALLOW THE INFLATOR MODULE TO
COOL
BEFORE HANDLING ANY METAL PORTION
OF
IT. DO NOT PLACE THE DEPLOYED INFLATOR
MODULE NEAR ANY FLAMMABLE OBJECTS.
FAILURE TO FOLLOW PROCEDURES MAY RESULT
IN FIRE OR PERSONAL INJURY.
AFTER AN INFLATOR MODULE HAS BEEN
DEPLOYED, THE METAL CANISTER AND
SURROUDING AREAS OF THE INFLATOR MODULE
WILL BE HOT. DO NOT TOUCH THE METAL AREAS
OF
THE INFLATOR MODULE FOR ABORT TWENTY
MINUTES AFTER DEPLOYMENT. IF THE DEPLOYED
INFLATOR MODULE MUST BE MOVED BEFORE IT
IS COOL,
WEAR GLOVES AND HANDLE BY THE AIR
BAG ITSELF.
21. Disconnect the pigtail adapter from the inflator
module as soon after deployment as possible to
avoid damage to the pigtail adaptor or SRS
Deployment Harness from contacting the hot inflator
module canister. The pigtail adapter and SIR
Deployment Harness are designed to be reused.
They should, however, be inspected for damage
after each deployment and replaced if necessary.
22. Dispose
of the deployed inflator module trough
normal refuse channels afterit has cooled for at least
20 minutes.
23. Wash
your hands with mild soap and water
afterward.
NOTE: The remaining steps are to be followed in the
unlikely event that the inflator module did not deploy after
following the above procedures.
24. Ensure that the
SRS Deplyment Harness has been
disconnected from the the power source and that its
two banana plugs have been shorted together by
fully seating one banana plug into the other.
25. Disconnect the pigtail adapter from the inflator
module.
WARNING: WHEN STORING A LIVE INFLATOR
MODULE OR WHEN LEAVING A LIVE INFLATOR
MODULE UNATTENDED ON A BENCH OR OTHER
SURFACE, ALWAYS
FACE THE BAG UP AND AWAY
FROM THE SURFACE. THIS IS NECESSARY SO
THAT A FREE SPACE IS PROVIDED TO ALLOW THE
Page 1646 of 1928
9J-22 Supplemental Restraint System
AIR BAG TO EXPAND IN THE UNLIKELY EVENT OF
ACCEIDENTAL DEPLOYMENT. FAILURE TO
FOLLOW PROCEDURES MAY RESULT IN
PERSONAL INJURY.
26. Temporarily store the inflator module with the bag
facing up, away from the surface upon which it rests.
27.
Call the Technical Assistance group for further
assistance.
DEPLOYMENT INSIDE VEHICLE(VEHICLE
SCRAPPING PROCEDURE)
Deployment inside vehicle is proper when the vehicle is
to be destroyed or
salvaged for component parts. 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
non-deployment type accident.
3. The vehicle has been stripped or damaged beyond
repair
in a theft.
4. 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 SRS components
from another
vehicle. This is done to ensure SRS
system integrity since only new SRS system
components.
WARNING: FAILURE TO FOLLOW PROPER SRS
INFLATOR MODULE DISPOSAL PROCEDURES
CAN RESULT IN AIR BAG DEPLOYMENT WHICH
MAY CAUSE PERSONAL INJURY. UNDEPLOYED
INFLATOR MODULES MUST NOT BE DISPOSED OF
THROUGH NORMAL REFUSE CHANNELS. THE
UNDEPLOYED INFLATOR MODULE CONTAINS
SUBSTANCES THAT CAL 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 LAWS.
1. Turn ignition switch to "LOCK," remove key and put
on safety glasses.
2. Remove all loose objects from front seats.
3. Disconnect driver inflator module, yellow 3-way
connector located at the base of the steering column.
4. Cut the driver inflator module yellow 2-way harness
connector from the
vehicle leaving at least 16 cm(six
inches) of wire at the connector.
5. Strip 13 mm(1/2 inch) of insulation from each wire
lead of the connector.
6. Cut two 900 cm(30 feet) deployment wires from
0.8mm2(18 gauge) or thicker
multi-strand wire. These
wires
will be used to fabricate the driver
deployment harness.
7. Strip 13 mm(1/2 inch) of insulation from both ends of
the wires cut
in the previous step.
8. Short the wires by twisting together one end from
each. Deployment wires
shall remain shorted and
not
be connected to a power source until the air bag
is to be
deployed.
WARNING: FAILURE TO
FOLLOW PROCEDURES
IN
THE ORDER LISTED COULD RESULT IN
PERSONAL INJURY. NEVER CONNECT
DEPLOYMENT WIRES TO ANY POWER SOURCE
BEFORE CONNECTING DEPLOYMENT WIRES TO
THE INFLATOR MODULE LEADS. DEPLOYMENT
WIRES SHALL REMAIN SHORTED AND NOT BE
CONNECTED TO A POWER SOURCE UNTIL THE
AIR BAG IS TO BE DEPLOYED. THE INFLATOR
MODULE WILL IMMEDIATELY DEPLOY THE AIR
BAG WHEN A POWER SOURCE IS CONNECTED TO
IT. WEAR SAFETY GLASSES THROUGHOUT THIS
ENTIRE DEPLOYMENT AND DISPOSAL
PROCEDURE.
9. Twist together one connector wire lead to one
deployment wire. The connection should be
mechanically secure.
10. Bend twisted connection made in the previous step
flat and wrap tightly with electrical tape to insulate ~
and secure.
11. Twist together, bend and tape the remaining
connector wire lead to the remaining deployment
wire.
12. Connect the deployment harness to the driver
inflator module, yellow 2-way connector at the base
of the steering
column. Route deployment harness
out the driver side of the
vehicle.
WARNING:
DEPLOYMENT WIRES SHALL REMAIN
SHORTED
AND NOT BE CONNECTED TO A POWER
SOURCE UNTIL THE AIR BAG IS TO BE DEPLOYED.
THE INFLATOR MODULE WILL IMMEDIATELY
DEPLOY THE AIR BAG WHEN A POWER SOURCE IS
CONNECTED TO IT.
CONNECTING THE DEPLOYMENT WIRES TO THE
POWER
SOURCE SHOULD ALWAYS BE THE FINAL
STEP IN
THE INFLATOR MODULE DEPLOYMENT
PROCEDURE. FAILURE TO FOLLOW
PROCEDURES IN THE ORDER LISTED COULD
RESULT IN PERSONAL INJURY.
13. Disconnect passenger inflator module, yellow 2-way
connector located behind 1/P compartment door
assembly.
14. Cut the passenger inflator module harness
connector from the vehicle leaving at least 16 cm(six
inches) of wire at the connector).
Page 1656 of 1928
9J-32 Supplemental Restraint System (SRS)
SRS DIAGNOSTIC SYSTEM CHECK
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
NON-POWERED 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 find and repair
SRS malfunctions. To get the
best results, it is important to use the diagnostic charts
and
follow the sequence listed below:
A. PERFORM THE "SRS DIAGNOSTIC SYSTEM
CHECK."
The "SRS Diagnostic System Check" must be the
starting point of any
SRS diagnostics. The "SRS
Diagnostic System Check" checks for proper "AIR
BAG"
warning lamp operation, the ability of the
DERM to communicate through the
"Serial Data" line
and whether SRS diagnostic trouble codes exist.
B. 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 malfunctions.
Bypassing these procedures may result
in extended
diagnostic time, incorrect diagnosis and incorrect
parts replacement.
C. 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 ensure
that the repair has been made correctly and that no
other malfunctions exist.
CIRCUIT DESCRIPTION
When the ignition switch is first turned "ON,""Ignition 1"
voltage is applied from the "C-22·C-23" fuse to the
DERM at the
"Ignition 1" input terminals "A9" and "A10"
and from the "C-21" fuse to the DERM at the "Redundant
Indicator Ignition 1" input terminal "B2". The DERM
responds by flashing the
"AIR BAG" warning lamp seven
times while performing tests on the
SRS.When the
engine is being cranked,
"Starter'' voltage is applied from
the
"C-1" fuse to the DERM at the "Crank" input terminal
"B10".The DERM responds by grounding the "SRS
Indicator"
output terminal "B 1" until "Starter" voltage is
removed from the "Crank" input. This results in the "AIR
BAG" warning lamp being "ON" steady during
cranking.After cranking, the DERM will flash the "AIR
BAG"
warning lamp six times and perform tests on the
SRS.
NOTES ON SYSTEM CHECK CHART ~
1. The "AIR BAG" warning lamp should flash seven
times after ignition is first turned
"ON."
2. The "AIR BAG" warning lamp should remain "ON"
steady during cranking.
3. When the "AIR BAG" warning lamp flashes four
times during
"Bulb Check" this indicates a
malfunction
in the redundant lamp driver circuitry.
These malfunctions are diagnosed by
DTC 62 chart.
4. After cranking, the "AIR BAG" warning lamp should
flash six times then go
"OFF."
5. Improper operation of the "AIR BAG" warning lamp
is indicated. This test differentiates a warning lamp
stays
"ON" condition from a warning lamp does not
come
"ON" condition.
6. This test checks for the proper operation of the
"Serial Data" line. This test will also determine
whether history diagnostic trouble codes are stored
and, if so, identify them.
7. This test checks for proper operation of the
"Serial
Data"
line. This test will also identify the stored
diagnostic trouble codes and
whether they are
current or history.
~
DIAGNOSTIC AIDS
The order in which diagnostic trouble codes are
diagnosed is very important. Failure to diagnose the
diagnostic trouble codes in the order specified may result
in extended diagnostic time, incorrect diagnosis and
incorrect parts replacement.
Page 1658 of 1928
9J-34 Supplemental Restraint System
TABLE A
DERM INTEGRITY CHECK
CIRCUIT DESCRIPTION
When the DERM recognizes "Ignition 1" voltage, applied
to terminals "A9" and "A10", is in the normal operating
voltage range, the "AIR BAG" warning lamp is flashed 7
timestoverifyoperation. At this time the DERM performs
"Turn-ON" tests followed by "Continuous Monitoring"
tests. When no malfunctions are detected the DERM
proceeds to the
"Initiator Assembly Resistance Test."
When a malfunction
is detected the DERM sets a current
diagnostic
trouble code and illuminates the "AIR BAG"
warning lamp. The DERM will clear current diagnostic
trouble codes and move them to a history file when the
malfunction is no
longer detected and/or the ignition
switch is
cycled, except for DTC 51. DTC 51 can only be
cleared using a scan tool "Clear Codes" command.
TO IGNITION SWITCH
FUSEl SRS C-24 lOA .... R D
CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic table.
1. This test confirms a current malfunction. If no current
malfunction is occurring(history DTC set) the
"Diagnostic Aids" for the appropriate diagnostic
trouble code should be referenced. The DERM
should not be replaced for a history diagnostic
trouble code.
2. This test checks for a malfunction introduced into the
SRS during the diagnostic process. It is extremely
unlikely
that a malfunctioning DERM would cause a
new malfunction to occur during the diagnostic
process.
3. When all circuitry outside the DERM has been found
to operate
properly, as indicated by the appropriate
diagnostic chart, then and
only then should the
DERM be
replaced.
IGNITION!
IGNITION
1
DRIVER 36VLR PASS.36VLR PASS. SOURCE SENSE
PASS SlOE HIGH
PASS SIDE LOW
SPARE/LPS
--------------------~&--~/
..
Page 1660 of 1928
9J-36 Supplemental Restraint System
TABLE B
"AIR BAG" WARNING LAMP COMES "ON" STEADY
CIRCUIT DESCRIPTION
When the ignition switch is first turned "ON," "Ignition 1"
voltage is applied from the "C-21" fuse to "Redundant
Indicator Ignition 1 ,"terminal "B2", and to the "AIR BAG"
warning lamp which is connected to "SRS Indicator,"
terminal "B1". The "C-22·C-23" fuses apply system
voltage to the
"Ignition 1" inputs, terminals "A9" and
"A10". The DERM responds by flashing the "AIR BAG"
warning lamp 7 times. If "Starter" is outside of the normal
operating voltage range, the
"AIR BAG" warning lamp
will
come "ON" solid with no DTCs set. When the engine
is being cranked,
"Ignition 1" voltage is applied from the
"C-1" fuse to the DERM at the "Crank" input. The DERM
responds by grounding the
"SRS" Indicator" output until
"Starter" voltage is removed from the "Crank'' input. This
results in the
"AIR BAG" warning lamp being "ON" during
cranking.After cranking, the DERM
will flash the "AIR
BAG" warning lamp 6 times.
CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic table.
1. An open "C-22-C-23" fuses would cause the "AIR
BAG" warning lamp to come "ON" steady.
2. A disconnected DERM harness connector will cause
the warning
lamp to come "ON" steady via the
shorting clip from terminal "A1" to terminal "81".
3. This test checks whether the short to ground caused
the
"C-1" fuse to open.
4. This test checks for an open in the ground circuitry
to the DERM.
5. This test determines whether the short to ground is
due to a malfunctioning dual pole arming sensor or
a short
in the wiring.
6. This test checks for an open in the "Ignition 1"
circuitry to the DERM.
7. This test checks for a short from the "SRS Indicator''
circuit to ground.
8. This test checks for a short from the "Crank" input
circuit to 8+.
SRS-1 JOINT CONNECTION TO IGNITION FUSE SRS C·23 10A 1!015 '12 10 IGNITION I IGNITION 1 SWITCH
FUSE~ SRS C-24 10A .... R D
PASS.3eVLR PASS. SOURCE SENSE
PASS SlOE HIGH
PASS SlOE LOW
SERIAL DATA
SRS INDICATOR
..
Page 1661 of 1928
Supplemental Restraint S~m 9J-37
TABLE B
"AIR BAG" WARNING LAMP COMES "ON" STEADY
STEP ACTION YES NO
1 WHEN MEASUREMENTS ARE REQUESTED IN THIS CHART USEJ-39200 DVM GotoStep2. GotoStep3. WITH CORRECTTERMINALADAPTER FROMJ-35616-A. WHEN A CHECK FOR PROPER CONNECTION IS REQUESTED. IGNITION SWITCH "OFF."
REMOVE AND INSPECT "C-22·C-23" FUSE.
IS FUSE GOOD?
2 INSPECT DERM HARNESS CONNECTOR CONNECTION TO DERM. GotoStep4. PROPERLY CONNECT
IS IT SECURELY CONNECTED TO THE DERM? DERM HARNESS
CONNECTOR TO DERM. INSTALL C-22·C-23 FUSE. GotoStep11.
3 REPLACEC-22·C-23 FUSE.JGNITION SWITCH "ON," WAIT 10SECONDS, THEN INSTALL C-22·C-23 Go to StepS.
IGNITION SWITCH "OFF."
FUSE.
REMOVE
AND INSPECT C-22·C-23 FUSE. IS FUSE GOOD? GotoStep11.
4 DISCONNECT DERM.CHECK FOR PROPER CONNECTION TO DERM AT Go to StepS REPLACE /SRS
TERMINALS "A1", "A9", "A10" AND "A12". HARNESS. IF OK, THEN MEASURE RESISTANCE FROM DERM HARNESS CONNECTOR RECONNECT DERM. TERMINAL "A1" TO "A2". INSTALL C-22·C-23 IS
RESISTANCE 5.00 OR LESS?
FUSE. Go to Step11.
5 DISCONNECT DUAL POLE ARMING SENSOR. REPLACE DUAL POLE REPLACE SRS REPLACE C-22·C-23 FUSE.
ARMING SENSOR. HARNESS.
IGNITION SWITCH "ON," WAIT 10 SECONDS, THEN IGNITION SWITCH "OFF .. INSTALL C-22·C-23 RECONNECT DUAL POLE
REMOVE AND INSPECT C-22·C-23 FUSE. FUSE. ARMING
IS FUSE GOOD? GotoStep11. SENSOR. REPLACE C-22·C-23 FUSE. Go to Step11.
6 INSTALL C-22·C-23 FUSE. IGNITION SWITCH GotoStep7. IGNITION SWITCH "ON."
"OFF."
MEASURE VOLTAGE FROM DERM HARNESS REPLACE SRS
CONNECTOR TERMINAL "A1"(GROUND) TO TERMINAL "A9". HARNESS.
IS VOLTAGE 1 VOLT OR LESS? RECONNECT DERM. INSTALL C-22·C-23 FUSE. GotoStep11.
7 INSTALL C-22·C-23 FUSE.DISCONNECT DRIVER AND PASSENGER GotoStep11. Go to StepS.
INFLATOR MODULES, YELLOW 2-WAY OR 4-WAY CONNECTORS LOCATED NEAR THE BASE OF STEERING COLUMN AND BEHIND THE liP COMPARTMENT DOOR ASSEMBLY.
CONNECT DERM HARNESS CONNECTOR TO J41433 SRS
DRIVER/PASSENGER LOAD TOOL.
IGNITION SWITCH "ON."
DOES "AIR
BAG" WARNING LAMP COME "ON"?
8 IGNITION SWITCH "OFF."
IGNITION SWITCH "OFF .. Go to Step10.
DISCONNECT SRS DRIVER/PASSENGER LOAD TOOL. Go to CHART A. IGNITION SWITCH "ON."
MEASURE VOLTAGE ON DERM HARNESS CONNECTOR FROM TERMINAL
"B10" TO TERMINAL "A1"(GROUND). IS VOLTAGE 1 VOLT OR LESS?
9 IGNITION SWITCH "OFF." GotoStep11. DISCONNECT SRS DRIVER/PASSENGER LOAD TOOL. REPLACE SRS HARNESS.
10 IGNITION SWITCH "OFF." Go to Step11. REPLACE SRS HARNESS.
11 RECONNECT ALL SRS COMPONENTS,
GO TO THE "SRS DIAGNOSTIC SYSTEM CHECK" ENSURE ALL COMPONENTS ARE PROPERLY MOUNTED.
REPEAT THE "SRS DIAGNOSTIC SYSTEM CHECK."