1998 ISUZU TROOPER warning

9J1±21
RESTRAINT CONTROL SYSTEM
DTC 19 Passenger Deployment Loop Short To B+
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests, ªIgnition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM monitors the voltages at ªDriver Bag Lowº
terminal ª4º and ªPassenger Bag Lowº terminal ª16º to
detect short to B+ in the air bag assembly circuits.
DTC Will Set When:
ªIgnition 1º is within the normal operating voltage range.
Once these conditions are met and the voltage at
ªPassenger Bag Lowº is above a specified value, DTC 19
will set. This test is run once each ignition cycle and
ªContinuous Monitoringº.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets
DTC 19 and also DTC 71.
DTC Will Clear When:
The SDM is replaced.
DTC Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:
2. This test determines whether the malfunction is in
the SDM.
3. This test isolates the malfunction to one side of the
passenger air bag assembly yellow 2±pin connector
behind glove box assembly.
4. This test determines whether the malfunction is in
IB07±YEL/GRN.
5. This test determines whether the malfunction is in
IB08±YEL/RED.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to B+ in the passenger air bag assembly circuit. Inspect
IB07±YEL/GRN and IB08±YEL/RED carefully for cutting
or chafing. If the wiring pigtail of the passenger air bag
assembly is damaged, the component must be replaced.
A careful inspection of IB07±YEL/GRN and
IB08±YEL/RED, including the passenger air bag
assembly pigtail is essential to ensure that the
replacement SDM will not be damaged.

9J1±23
RESTRAINT CONTROL SYSTEM
DTC 21 Driver Deployment Loop Resistance High
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests, ªIgnition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM then proceeds with the ªResistance
Measurement Testº ªDriver Bag Lowº terminal ª4º is
grounded through a current sink and the driver current
source connected to ªDriver Bag Highº terminal ª3º allows
a known amount of current to flow. By monitoring the
voltage difference between ªDriver Bag Highº and ªDriver
Bag Lowº, the SDM calculates the combined resistance
of the driver air bag assembly, SRS coil assembly,
harness wiring IB05±YEL and IB06±YEL/BLK, and
connector terminal contact.
DTC Will Set When:
The combined resistance of the driver air bag assembly,
SRS Coil assembly, harness wiring IB05±YEL and
IB06±YEL/BLK, and connector terminal contact is above
a specified value. This test run once each ignition cycle
during the ªResistance Measurement Testº when:
1. No ªhigher priority faultsº are detected during
ªTurn±ONº
2. ªIgnition 1º voltage is in the specified value.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets
DTC 21.
DTC Will Clear When:
The ignition switch is turned ªOFFº.
DTC Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:
2. This test determines whether the malfunction is in
the SDM.
3. This test verifies proper connection of the yellow
2±pin connector at the base of the steering column.
4. This test checks for proper contact and/or corrosion
of the 2±pin connector terminals at the base of
steering column.
5. This test isolate the malfunction to one side of the
SRS coil assembly yellow 2±pin connector located
at the base of the steering column.
6. This test determines whether the malfunction is due
to high resistance in the wiring.
7. This test determines whether the malfunction is in
the SRS coil assembly or the driver air bag
assembly.

RESTRAINT CONTROL SYSTEM 9J1±24
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at terminals ª1º and ª2º of the SRS coil 2±pin
connector at the base of the steering column, terminal ª1º
and ª2º of the driver air bag assembly 2±pin connector at
the top of the steering column, SDM terminals ª3º and ª4º
or a poor wire to terminal connection in IB05±YEL orIB06±YEL/BLK. The test for this diagnostic trouble code
is only run while the ªAIR BAGº warning lamp is
performing the bulb check, unless DTC 17 or DTC 26 is
detected. When a scan tool ªClear Codesº command is
issued and the malfunction is still present, the DTC will not
reappear until the next ignition cycle.
DTC 21 Driver Deployment Loop Resistance High
StepActionYe sNo
1Perform the ªSRS Diagnostic System Checkº.
Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Repeat the ªSRS
Diagnostic
System Checkº
21. When measurements are requested in this chart use
5±8840±0285±0 DVM with correct terminal adapter from
5±8840±0385±0.
2. Use scan tool data list function, read and record the driver
deployment loop resistance.
Is driver resistance more than 3.7 ohms?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Disconnect SRS coil assembly yellow 2±pin connector located
at base of steering column is seated properly.
Is the 2±pin connector connected properly?
Go to Step 4
Seat SRS coil
assembly 2±pin
connector
properly
Go to Step 8
41. Disconnect and inspect the SRS coil assembly yellow 2±Pin
connector located base of steering column.
2. If ok, reconnect the SRS coil assembly yellow 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 21 current?
Go to Step 5Go to Step 8
51. Ignition switch ªOFF.º
2. Disconnect SRS coil and passenger air bag assembly, yellow
2±pin connector located at the base of steering column and
behind the glove box assembly.
3. Connect SRS driver / passenger load tool 5±8840±2421±0
and appropriate adapter to SRS coil and passenger air bag
assembly harness connectors.
4. Ignition switch ªON.º
Is DTC 21 current?
Go to Step 6Go to Step 7
61. Ignition switch ªOff.º
2. There has been a increase in the total circuit resistance of the
driver deployment loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB05±YEL and IB06±YEL/BLK, and SDM connector
terminal ª3º and ª4º to locate the root cause.
Was a fault found?
Replace SRS
harness
Go to Step 8
Go to Chart A

RESTRAINT CONTROL SYSTEM 9J1±26
DTC 22 Driver Deployment Loop Resistance Low
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests ªIgnition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM then proceeds with the ªResistance
Measurement Testº ªDriver Bag Lowº terminal ª4º is
grounded through a current sink and the driver current
source connected to ªDriver Bag Highº terminal ª3º allows
a known amount of current to flow. By monitoring the
voltage difference between ªDriver Bag Highº and ªDriver
Bag Lowº the SDM calculates the combined resistance of
the driver air bag assembly, SRS coil assembly, harness
wiring IB05±YEL and IB06±YEL/BLK and connector
terminal contact.
DTC Will Set When:
The combined resistance of the driver air bag assembly,
SRS Coil assembly, harness wiring IB05±YEL and
IB06±YEL/BLK and connector terminal contact is above a
specified value. This test is run once each ignition cycle
during the ªResistance Measurement Testº when:
1. No ªhigher priority faultsº are detected during
ªTurn±ONº
2. ªIgnition 1º voltage is in the specified value.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets
DTC 22.
DTC Will Clear When:
The ignition switch is turned ªOFF.º
DTC Chart Test Description:
Number(s) below refer to circled number(s) on the
diagnostic chart:
2. This test determines whether the malfunction is in
the SDM.
3. This test verifies proper connection of the yellow
2±pin connector at the base of the steering column.
4. This test checks for proper operation of the shorting
clip in the yellow 2±pin connector.
5. This test isolate the malfunction to one side of the
SRS coil assembly yellow 2±pin connector located
at the base of steering column.
6. This test determines whether the malfunction is due
to shortening in the wiring.
7. This test determines whether the malfunction is in
the SRS coil assembly or the driver air bag
assembly.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
between IB05±YEL or IB06±YEL/BLK or a

9J1±27
RESTRAINT CONTROL SYSTEM
malfunctioning shorting clip on the driver air bag
assembly or SRS coil assembly which would require
replacement of the component. The test for this
diagnostic trouble code is only run while the ªAIR BAGº
warning lamp is performing the bulb check, unless DTC17 or DTC 26 is detected. When a scan tool ªClear
Codesº command is issued and the malfunction is still
present, the DTC will not reappear until the next ignition
cycle.
DTC 22 Driver Deployment Loop Resistance Low
StepActionYe sNo
1Perform the ªSRS Diagnostic System Check.º
Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Checkº
21. When measurements are requested in this chart use
5±8840±0285±0 DVM with correct terminal adapter from
5±8840±0385±0.
2. Use scan tool data list function, read and record the driver
deployment loop resistance.
Is driver deployment loop resistance less than 1.7 OHMS?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Make sure the SRS coil assembly yellow 2±pin connector
located at the base of steering column is seated properly.
Is the 2±pin connector connected properly?
Go to Step 4
Seat driver air
bag assembly
2±pin connector
properly
Go to Step 8
41. Disconnect and inspect the SRS coil assembly yellow 2±pin
connector located base of steering column.
2. If ok, reconnect the SRS coil assembly yellow 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 22 current?
Go to Step 5Go to Step 8
51. Ignition switch ªOFF.º
2. Disconnect SRS coil and passenger air bag assembly, yellow
2±pin connector located at the base of steering column and
behind the glove box assembly.
3. Connect SRS driver / passenger load tool 5±8840±2421±0
and appropriate adapter to SRS coil and passenger air bag
assembly harness connectors.
4. Ignition switch ªON.º
Is DTC 22 current?
Go to Step 6Go to Step 7
61. Ignition switch ªOFF.º
2. There has been a decrease in the total circuit resistance of the
driver deployment loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB05±YEL and IB06±YEL/BLK, and SDM connector
terminal ª3º and ª4º to locate the root cause.
Was a fault found?
Replace SRS
harness
Go to Step 8
Go to Chart A

9J1±29
RESTRAINT CONTROL SYSTEM
DTC 24 Driver Deployment Loop Short To Ground
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests, ªIgnition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM monitors the voltage at ªDriver Bag Lowº
terminal ª4º and ªpassenger Bag Lowº terminal ª16º to
detect shorts to ground in the air bag assembly circuits.
DTC Will Set When:
Neither of the two air bag assemblies is open.
ªIgnition 1º is within the normal operating voltage range.
This test is run once each ignition cycle and ªContinuous
Monitoringº. Once these conditions are met and the
voltage at ªDriver Bag Lowº is below a specified value,
DTC 24 will set.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
The malfunction is no longer occurring and the ignition is
turned ªOFFº.
DTC Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:
2. This test determines whether the SDM is
malfunctioning
3. This test isolates the malfunction to one side of the
SRS coil assembly yellow 2±pin connector at the
base of the steering column.
4. This test determines whether the malfunction is in
IB05±YEL.
5. This test determines whether the malfunction is in
IB06±YEL/BLK.
6. This test determines whether the malfunction is in
the SRS coil assembly or the driver air bag
assembly.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to ground in the driver air bag assembly circuit. Inspect
IB05±YEL and IB06±YEL/BLK carefully for cutting or
chafing.

9J1±31
RESTRAINT CONTROL SYSTEM
DTC 25 Driver Deployment Loop Short To B+
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests, ªIgnition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM monitors the voltage at ªDriver Bag Lowº
terminal ª4º and ªPassenger Bag Lowº terminal ª16º to
detect shorts to B+ in the air bag assembly circuits.
DTC Will Set When:
ªIgnition 1º is in the normal operating voltage range. This
test is run once each ignition cycle and ªContinuous
monitoringº. Once these conditions are met and the
voltage at ªDriver Bag Lowº is above a specified value,
DTC 25 will set.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets
DTC 25 and also DTC 71
DTC Will Clear When:
The SDM is replaced.
DTC Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:2. This test determines whether the SDM is
malfunctioning.
3. This test isolates the malfunction to one side of the
driver air bag assembly yellow 2±pin connector at
the base of steering column.
4. This test determines whether the malfunction is in
IB05±YEL.
5. This test determines whether the malfunction is in
IB06±YEL/BLK.
6. This test determines whether the malfunction is in
the SRS coil assembly or the driver air bag
assembly.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to B+ in the driver air bag assembly circuit. Inspect
IB05±YEL and IB06±YEL/BLK carefully for cutting or
chafing. If the wiring pigtail of the driver air bag assembly
and SRS coil assembly is damaged, the components
must be replaced. A careful inspection of IB05±YEL and
IB06±YEL/BLK, including the SRS coil assembly and
driver air bag assembly is essential to ensure that the
replacement SDM will not be damaged.

9J1±33
RESTRAINT CONTROL SYSTEM
DTC 26 Driver Deployment Loop Open
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests, ªIgnition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges.
During ªContinuous Monitoringº diagnostics, a fixed
amount of current is following in the deployment loop.
This produces proportional voltage drops in the loop. By
monitoring the voltage difference between ªDriver Bag
Highº and ªDriver Bag Lowº, the SDM calculates the
combined resistance of the driver air bag assembly, SRS
coil assembly, harness wiring IB05±YEL and
IB06±YEL/BLK, and connector terminal contact.
DTC Will Set When:
The voltage difference between ªDriver Bag Highº
terminal ª3º and ªDriver Bag Lowº terminal ª4º is above or
equal to a specified value for 500 milliseconds during
ªContinuous Monitoringº.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
The voltage difference between ªDriver Bag Highº
terminal ª3º and ªDriver Bag Lowº terminal ª4º is below aspecified value for 500 milliseconds during ªContinuous
Monitoringº.
DTC Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:
2. This test determines whether the malfunction is in
the SDM.
3. This test verifies proper connection of the yellow
2±pin connector at the base of the steering column.
4. This test checks for proper contact and/or corrosion
of the yellow 2±pin connector at the base of the
steering column.
5. This test isolates the malfunction to one side of the
SRS coil assembly yellow 2±pin connector located
at the base of steering column.
6. This test determines whether the open is in the
wiring.
7. This test determines whether the malfunction is in
the SRS coil assembly or the driver air bag
assembly.
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at the driver air bag assembly harness 2±pin
connector terminals ª1º and ª2º at the top of the steering
column, SRS coil assembly harness 2±pin connection
terminals ª1º and ª2º, SDM terminals ª3º and ª4º, or an
open in IB05±YEL and IB06±YEL/BLK.