2002 ISUZU AXIOM ignition

9J1±27
RESTRAINT CONTROL SYSTEM
DTC 21 Driver Deployment Loop Resistance High
StepActionYe sNo
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Check.º
21. When measurements are requested in this chart use J±39200
DVM with correct terminal adapter from J±35616±A.
2. Use scan tool data list function, read and record the driver
deployment loop resistance.
Is driver deployment loop resistance more than 4.4 ohms?
Go to Step 3 Go to Chart A .
31. Ignition switch ªOFF.º
2. Disconnect driver air bag 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 5
Ignition switch
ªOFF.º
Go to
Step 8
51. Ignition switch ªOFF.º
2. Disconnect SRS coil and passenger air bag assembly yellow
2±pin connectors located at the base of steering column and
behind the glove box assembly.
3. Connect SRS driver / passenger load tool J±41433 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 6 Go 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 CKTs IB05±YEL/IB06±GRN and 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 .
71. Ignition switch ªOFF.º
Disconnect SRS driver / passenger load tool from SRS coil
assembly harness connector.
Connect SRS driver / passenger load tool J±41433 on the top
of steering column.
Reconnect SRS coil assembly harness connector as the base
of steering column.
Ignition switch ªON.º
Is DTC 21 current?
Ignition switch
ªOFF.º
Replace SRS
COIL
ASSEMBLY.
Refer to in this
section 9J±24.
Go to
Step 8
Ignition switch
ªOFF.º
Replace driver air
bag assembly.
Go to
Step 8
8Reconnect all components, ensure all component are properly
mounted.
Clear diagnostic trouble codes.
Was this step finished?
Repeat the ªSRS
Diagnostic
System Check.º
Go to Step 8 .

RESTRAINT CONTROL SYSTEM 9J1±28
DTC 22 Driver Deployment Loop Resistance Low
D09R200001
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 CKTs
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 CKTs 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

9J1±29
RESTRAINT CONTROL SYSTEM
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 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 shorting 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 CKT IB05±YEL or IB06±YEL/BLK or a
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 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.

RESTRAINT CONTROL SYSTEM 9J1±30
DTC 22 Driver Deployment Loop Resistance Low
StepActionYe sNo
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Check.º
21. When measurements are requested in this chart use J±39200
DVM with correct terminal adapter from J±35616±A.
2. Use scan tool data list function, read and record the driver
deployment loop resistance.
Is driver resist. less than 1.9 ohms?
Go to Step 3 Go 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 driver air bag assembly yellow 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 22 current?
Go to Step 5
Ignition switch
ªOFF.º
Go to
Step 8
51. Ignition switch ªOFF.º
2. Disconnect SRS coil and passenger air bag 2±pin connectors
located at the base of steering column and behind the glove
box assembly.
3. Connect SRS driver / passenger load tool J±41433 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 6 Go 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 CKTs 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 .
71. Ignition switch ªOFF.º
2. Disconnect SRS driver / passenger load tool from SRS coil
assembly harness connector.
3. Connect SRS driver / passenger load tool J±41433 to the top
of steering column.
4. Reconnect SRS coil assembly harness connector as the base
of steering column.
5. Ignition switch ªON.º
Is DTC 22 current?
Ignition switch
ªOFF.º
Replace SRS coil
assembly.
Refer to in this
section 9J±24.
Go to
Step 8
Ignition switch
ªOFF.º
Replace driver air
bag assembly.
Go to
Step 8
81. Reconnect all components, ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Repeat the ªSRS
Diagnostic
System Check.º
Go to Step 8

9J1±31
RESTRAINT CONTROL SYSTEM
DTC 24 Driver Deployment Loop Short To Ground
D09R200001
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 ªOFF.º
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
CKT IB05±YEL.

RESTRAINT CONTROL SYSTEM 9J1±32
5. This test determines whether the malfunction is in
CKT 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
CKTs IB05±YEL and IB06±YEL/BLK carefully for cutting
or chafing.
DTC 24 Driver Deployment Loop Short To Ground
StepActionYe sNo
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Check.º
21. When measurements are requested in this chart use J±39200
DVM with correct terminal adapter from J±35616±A.
2. Ignition switch ªOFF.º
3. Connect scan tool data link connector. Follow directions as
given in the scan tool operator's manual.
Ignition switch ªON.º
4. Read driver sense LO.
Is driver sense LO less than 1.5 volts?
Go to Step 3 Go to Chart A .
31. Ignition switch ªOFF.º
2. Disconnect SRS coil assembly yellow 2±pin connector located
at base of the steering column. Leave passenger air bag
assembly connected.
3. Connect SRS driver / passenger load tool J±41433 and
appropriate adapter to SRS coil assembly harness connector.
4. Ignition switch ªON.º
Is DTC 24 current?
Go to Step 4 Go to Step 6
41. Ignition switch ªOFF.º
2. Disconnect SDM.
3. Disconnect SRS driver / passenger load tool.
4. Measure resistance on SDM harness connector ª3º to terminal
ª6º (ground).
Does J±39200 display ª0Lº (infinite)?
Go to Step 5
Replace SRS
harness.
Go to
Step 7
5Measure resistance on SDM harness connector from terminal ª4º
to terminal ª6º (ground).
Does J±39200 display ª0Lº (infinite)?
Go to Chart A .
Replace SRS
harness.
Go to
Step 7
61. Ignition switch ªOFF.º
2. Disconnect SRS driver / passenger load tool J±41433 from
SRS coil assembly harness connector.
3. Connect SRS driver / passenger load tool J±41433 and
appropriate adapter J±35616±A to driver air bag assembly
harness connector. Located top of the steering column.
4. Reconnect SRS coil assembly harness connector as the base
of steering column.
5. Ignition switch ªON.º
Is DTC 24 current?
Ignition switch
ªOFF.º
Replace SRS coil
assembly.
Refer to in this
section 9J±24.
Go to
Step 7
Ignition switch
ªOFF.º
Replace driver air
bag assembly.
Go to
Step 7
71. Reconnect all components, ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Repeat the ªSRS
Diagnostic
System Check.º
Go to Step 7

9J1±33
RESTRAINT CONTROL SYSTEM
DTC 25 Driver Deployment Loop Short To Voltage
D09R200001
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
SRS coil assembly yellow 2±pin connector at the
base of steering column.
4. This test determines whether the malfunction is in
CKT IB05±YEL.
5. This test determines whether the malfunction is in
CKT IB06±YEL/BLK.

9J1±35
RESTRAINT CONTROL SYSTEM
DTC 25 Driver Deployment Loop Short To Ignition
CAUTION: When DTC 25 has been set, it is necessary to replace the SDM. Setting DTC 25 will also cause DTC
71 to set. When a scan tool ªCLEAR CODESº command is issued and the malfunction is no longer present,
DTC 71 will remain current. Ensure that the short to voltage condition is repaired prior to installing a
replacement SDM to avoid damaging the SDM.
Step
ActionYe sNo
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Check.º
21. When measurements are requested in this chart use J±39200
DVM with correct terminal adapter from J±35616±A.
2. Ignition switch ªOFF.º
3. Connect scan tool data link connector. Follow directions as
given in the scan tool operator's manual.
4. Ignition switch ªON.º
5. Read driver sense LO.
Is driver sense LO more than 3.5 volts?
Go to Step 3 Go to Chart A .
31. Ignition switch ªOFF.º
2. Disconnect SRS coil assembly yellow 2±pin connector at the
base of the steering column. Leave passenger air bag
assembly connected.
Connect SRS driver / passenger load tool J±41433 and
appropriate adapter to SRS coil assembly harness connector.
3. Ignition switch ªON.º
Is driver sense LO more than 3.5 volts?
Go to Step 4 Go to Step 6
41. Ignition switch ªOFF.º
2. Disconnect SDM.
3. Disconnect SRS drive / passenger load tool.
4. Measure resistance on SDM harness connector from terminal
ª3º to terminal ª12º (Ignition 1).
Does J±39200 display ª0Lº (infinite)?
Go to Step 5
Replace SRS
harness.
Go to
Step 7
5Measure resistance on SDM harness connector from terminal ª4º
to terminal ª12º (Ignition 1).
Does J±39200 display ª0Lº (infinite)?
Go to Chart A .
Replace SRS
harness.
Go to
Step 7
61. Ignition switch ªOFF.º
2. Connect SRS driver / passenger load tool J±41433 and
appropriate adapter J±35616±A to driver air bag assembly
harness connector located of top of the steering column.
3. Reconnect SRS coil assembly harness connector as the base
of steering column.
4. Ignition switch ªON.º
Is driver sense LO more than 3.5 volts?
Ignition switch
ªOFF.º
Replace SRS coil
assembly.
Go to
Step 7
Ignition switch
ªOFF.º
Replace driver air
bag assembly.
Go to
Step 7
71. Reconnect all components, ensure all components are
properly mounted.
2. Ignition switch ªON.º
Is passenger sense LO less than 3.5 volts?
Replace SDM.
Go to
Step 8 Go to Chart A .
81. Reconnect all components, ensure all components are
properly mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Repeat the ªSRS
Diagnostic
System Check.º
Go to Step 8