ISUZU TROOPER 1998 Service Repair Manual

RESTRAINT CONTROL SYSTEM 9J1±44
DTC 29 Passenger Pretensioner Loop Short To Ground
StepActionYe sNo
1Was 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. 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 passenger sense LO.
Is passenger sense LO less than 1.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Disconnect passenger pretensioner assembly yellow 2±pin
connector at the base of the passenger seat.
3. Leave driver pretensioner assembly connected.
4. Connect SRS driver / passenger load tool 5±8840±2421±0
and appropriate adapter to passenger pretensioner assembly
harness connector.
5. Ignition switch ªON.º
Is DTC 29 current?
Go to Step 4
Ignition switch
ªOFFº
Replace
passenger
pretensioner
assembly
Go to Step 6
41. Ignition switch ªOFFº.
2. Disconnect SRS driver / passenger load tool
3. Measure resistance on SDM harness connector from terminal
ª9º to terminal ª6º (ground).
Does 5±8840±0285±0 display ªOLº (Infinite)?
Go to Step 5
Replace SRS
harness or repair
chassis harness
Go to Step 6
5Measure resistance on SDM harness connector from terminal
ª10º to terminal ª6º (ground).
Does 5±8840±0285±0 display ªOLº (Infinite)?
Go to Chart A
Replace SRS
harness or repair
chassis harness
Go to Step 6
61. Reconnect all components and ensure all component are
properly mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Go to the ªSRS
Diagnostic
system Checkº
Go to Step 6

9J1±45
RESTRAINT CONTROL SYSTEM
DTC 31 Passenger Pretensioner 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. ªPassenger Belt Lowº terminal ª10º is grounded
through a resister and the passenger current source
connected to ªPassenger Belt Highº terminal ª9º allows a
known amount of current to flow. By monitoring the
voltage difference between ªPassenger Belt Highº and
ªPassenger Belt Lowº the SDM calculates the combined
resistance of the passenger air bag assembly, harness
wiring IB15±BLU/BLK and IB16±BLU/ORG connector
terminal contact.
DTC Will Set When:
The combined resistance of the passenger pretensioner
assembly, harness wiring IB15±BLU/BLK and
IB16±BLU/ORG, 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 a
diagnostic trouble code.
DTC Will Clear When:
The ignition switch 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 malfunction is in
the SDM.
3. This test verifies proper connection of the yellow
2±pin connector.
4. This test checks for proper contact and/or corrosion
of the yellow 2±pin connector terminals.
5. The test checks for a malfunctioning passenger
pretensioner assembly.
6. This test determines whether the malfunction is due
to high resistance in the wiring.
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at the passenger air bag assembly harness
connector terminals ª1º and ª2º, SDM terminal ª9º and
ª10º, or a poor wire to terminal connection in
IB15±BLU/BLK and IB16±BLU/ORG. This test for this
diagnostic trouble code is only run while the ªAIR BAGº

RESTRAINT CONTROL SYSTEM 9J1±46
warning lamp is performing the bulb check. When a scan
tool ªClear Codesº command is issued and themalfunction is still present, the DTC will not reappear until
the next ignition cycle.
DTC 31 Passenger Pretensioner loop Resistance High
StepActionYe sNo
1Was 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 passenger
pretensioner loop resistance.
Is passenger resist. more than 3.7 ohms?
Go to Step 3Go to Chart A
31. Ignition switch ªOff.º
2. Make sure the passenger pretensioner assembly yellow 2±pin
connector located at the base of the passenger seat.
Is the yellow 2±pin connector connected properly?
Go to Step 4
Seat passenger
pretensioner
assembly yellow
2±pin connector
properly
Go to Step 7
41. Disconnect and inspect the passenger pretensioner assembly
yellow 2±pin connector located at the base of the passenger
seat.
2. If ok, reconnect the passenger pretensioner assembly 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 31 current?
Go to Step 5Go to Step 7
51. Ignition switch ªOff.º
2. Disconnect passenger pretensioner assembly, yellow 2±pin
connector located at the base of the passenger seat.
3. Connect 5±8840±2421±0 SRS driver / passenger load tool
and appropriate adapters to passenger pretensioner
assembly harness connectors.
4. Ignition switch ªON.º
Is DTC 31 Current?
Go to Step 6
Ignition switch
ªOffº
Replace the
passenger
pretensioner
assembly
Go to Step 7
61. Ignition switch ªOff.º
2. There has been an increase in the total circuit resistance of the
passenger loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB15±BLU/BLK and IB16±BLU/ORG, and SDM
connector terminal ª9º and ª10º to locate the root cause.
Was a fault found?
Replace SRS
harness or repair
chassis harness
Go to Step 7
Go to Chart A
71. Reconnect all components ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was This step finished?
Repeat the ªSRS
Diagnostic
System Checkº
Go to Step 7

9J1±47
RESTRAINT CONTROL SYSTEM
DTC 32 Passenger Pretensioner 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
pretensioner loop voltages are measured to ensure they
are within their respective normal voltage ranges. The
SDM then proceeds with the ªResistance Measurement
Testº. ªPassenger Belt Lowº terminal ª10º is grounded
through a resistor and the passenger current source
connected to ªPassenger Belt Highº terminal ª9º allows a
known amount of current to flow. By monitoring the
voltage difference between ªPassenger Belt Highº and
ªPassenger Belt Lowº, the SDM calculates the combined
resistance of the passenger air bag assembly, harness
wiring IB15±BLU/BLK and IB16±BLU/ORG connector
terminal contact.
DTC Will Set When:
The combined resistance of the passenger air bag
assembly, harness wiring IB15±BLU/BLK and
IB16±BLU/ORG, 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 a
diagnostic trouble code.
DTC Will Clear When:
The ignition switch 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 malfunction is in
the SDM.
3. This test verifies connection of the yellow 2±pin
connector.
4. This test cheeks for proper operation of the shorting
clip in the yellow 2±pin connector.
5. The test checks for a malfunction passenger
pretensioner assembly.
6. This test determines whether the malfunctioning is
due to shortening in the wiring.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
between IB15±BLU/BLK and IB16±BLU/ORG, or a
malfunctioning shorting clip on the passenger
pretensioner assembly which would require replacement
of the pretensioner assembly. The test for this diagnostic
trouble code is only run while ªAIR BAGº warning lamp is

RESTRAINT CONTROL SYSTEM 9J1±48
performing the bulb check. When a scan tool ªClear
Codesº command is issued and the malfunction is stillpresent, the DTC will not reappear until the next ignition
cycle.
DTC 32 Passenger Pretensioner loop Resistance Low
StepActionYe sNo
1Was 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. Using scan tool data list function, read and record the
passenger pretensioner loop resistance.
Is passenger resist. less than 1.4 ohms?
Go to Step 3Go to Chart A
31. Ignition switch ªOff.º
2. Make sure the passenger pretensioner assembly yellow 2±pin
connector located at the base of the passenger seat.
Is the yellow 2±pin connector connected properly?
Go to Step 4
Seat passenger
pretensioner
assembly yellow
2±pin connector
properly
Go to Step 7
41. Disconnect and inspect the passenger pretensioner assembly
yellow 2±pin connector located at the base of the passenger
seat.
2. If ok, reconnect the passenger pretensioner assembly 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 32 Current?
Go to Step 5Go to Step 7
51. Ignition switch ªOff.º
2. Disconnect passenger pretensioner assembly, yellow 2±pin
connector located at the base of the passenger seat.
3. Connect 5±8840±2421±0 SRS driver/passenger load tool and
appropriate adapters to passenger pretensioner assembly
harness connectors.
4. Ignition switch ªON.º
Is DTC 32 current?
Go to Step 6
Ignition switch
ªOffº
Replace the
passenger
pretensioner
assembly
Go to Step 7
61. Ignition switch ªOff.º
2. There has been a decrease in the total circuit resistance of the
passenger pretensioner loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB15±BLU/BLK and IB16±BLU/ORG, and SDM
connector terminal ª9º and ª10º to locate the root cause.
Was a fault found?
Replace SRS
harness or repair
chassis harness
Go to Step 7
Go to Chart A
71. Reconnect all components, ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Repeat the ªSRS
Diagnostic
System Checkº
Go to Step 7

9J1±49
RESTRAINT CONTROL SYSTEM
DTC 33 Passenger Pretensioner Loop Short To Voltage
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
pretensioner loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM monitors the voltages at ªDriver Belt Lowº
terminal ª10º and ªPassenger Belt Lowº terminal ª22º to
detect short to B+ in the pretensioner 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 pretensioner Lowº is above a specified value,
DTC 33 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 33.
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 malfunction is in
the SDM.
3. This test isolates the malfunction to one side of the
passenger pretensioner assembly yellow 2±pin
connector at the base of the passenger seat.
4. This test determines whether the malfunction is in
IB15±BLU/BLK.
5. This test determines whether the malfunction is in
IB16±BLU/ORG.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to B+ in the passenger pretensioner assembly circuit.
Inspect IB15±BLU/BLK and IB16±BLU/ORG carefully for
cutting or chafing. If the wiring pigtail of the passenger
pretensioner assembly is damaged, the component must
be replaced. A careful inspection of IB15±BLU/BLK and
IB16±BLU/ORG, including the passenger pretensioner
assembly pigtail is essential to ensure that the
replacement SDM will not be damaged.

RESTRAINT CONTROL SYSTEM 9J1±50
DTC 33 Passenger Pretensioner Loop Short To Voltage
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. 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 passenger belt sense LO.
Is passenger belt sense LO more than 3.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch ªOFFº.
2. Disconnect passenger pretensioner assembly yellow 2±pin
connector at the base of the passenger seat.
3. Leave driver pretensioner assembly connected.
4. Connect SRS driver / passenger load tool 5±8840±2421±0
and appropriate adapter to passenger air bag assembly
harness connector.
5. Ignition switch ªON.º
Is DTC 33 current?
Go to Step 4
Ignition switch
ªOFFº
Replace
passenger
pretensioner
assembly
Go to Step 6
41. Ignition switch ªOFF.º
2. Disconnect SRS driver / passenger load tool.
3. Measure resistance on SDM harness connector from terminal
ª9º to terminal ª12º (ignition).
Does 5±8840±0285±0 display ªOLº (infinite)?
Go to Step 5
Replace SRS
harness
Go to Step 6.
5Measure resistance on SDM harness connector from terminal
ª10º and terminal ª12º (ignition).
Does 5±8840±0285±0 display ªOLº (infinite)?
Go to Chart A
Replace SRS
harness
Go to Step 6
61. Reconnect all components ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Repeat the ªSRS
Diagnostic
System Checkº
Go to Step 6

9J1±51
RESTRAINT CONTROL SYSTEM
DTC 34 Passenger Pretensioner 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
pretensioner loop voltages are measured to ensure they
are within their respective normal voltage ranges. During
ªContinuous Monitoringº diagnostics, a fixed amount of
current is flowing in the deployment loop. This produces
proportional voltage drops in the loop. By monitoring the
voltage difference between ªPassenger Belt Highº and
ªPassenger Belt Lowº, the SDM calculates the combined
resistance of the passenger pretensioner assembly,
harness wiring IB15±BLU/BLK AND IB16±BLU/ORG,
and connector terminal contact.
DTC Will Set When:
The voltage difference between ªPassenger pretensioner
Highº terminal ª9º and ªPassenger pretensioner Lowº
terminal ª10º 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 ªPassenger Belt Highº
terminal ª9º and ªPassenger Belt Lowº terminal ª10º isbelow a specified 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.
4. This test cheeks for proper contact and/or corrosion
of the shorting clip in the yellow 2±pin connector
terminals.
5. The test checks for a malfunctioning passenger
pretensioner assembly.
6. This test determines whether the open in the wiring.
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at the passenger pretensioner assembly
harness connector terminalsª1º and ª2º, SDM terminals
ª9º and ª10º, or an open in IB15±BLU/BLK and
IB16±BLU/ORG.

RESTRAINT CONTROL SYSTEM 9J1±52
DTC 34 Passenger Pretensioner Loop Open
StepActionYe sNo
1Was 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. Using scan tool data list function, read and record the
passenger pretensioner differential voltage.
Is passenger pretensioner VDIF 0.425 volts or more?
Go to Step 3Go to Chart A
31. Ignition switch ªOFFº.
2. Make sure the passenger pretensioner assembly yellow 2±pin
connector located at the base of the passenger seat.
Is the yellow 2±pin connector connected properly?
Go to Step 4
Seat passenger
pretensioner
assembly yellow
2±pin connector
properly
Go to Step 7
41. Disconnect and inspect the passenger pretensioner assembly
yellow 2±pin connector located at the base of the passenger
seat.
2. If ok, reconnect the passenger pretensioner assembly 2±pin
connector.
3. Ignition switch ªONº.
Is DTC 34 current?
Go to Step 5Go to Step 7
51. Ignition switch ªOff.º
2. Disconnect the passenger pretensioner assembly, yellow
2±pin connector located at the base of the passenger seat.
3. Connect 5±8840±2421±0 SRS driver / passenger load tool
and appropriate adapters to passenger pretensioner
assembly harness connectors.
4. Ignition switch ªON.º
Is DTC 34 current?
Go to Step 6
Ignition switch
ªOffº
Replace the
passenger
pretensioner
assembly
Go to Step 7
61. Ignition switch ªOff.º
2. There has been an open circuit resistance in the passenger
pretensioner loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB15±BLU/BLK and IB16±BLU/ORG, and SDM
connector terminal ª9º and ª10º to locate the root cause.
Was a fault found?
Replace SRS
harness or repair
chassis harness
Go to Step 7
Go to Chart A
71. Reconnect all components ensure all component are properly
mounted.
2. Clear diagnostic trouble codes.
Was this step finished?
Go to the ªSRS
Diagnostic
System Checkº
Go to Step 7

9J1±53
RESTRAINT CONTROL SYSTEM
DTC 41 Driver Pretensioner 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
pretensioner loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM then proceeds with the ªResistance
Measurement Testº ªDriver Belt Lowº terminal ª22º is
grounded through a current sink and the driver current
source connected to ªDriver Belt Highº terminal ª21º
allows a known amount of current to flow. By monitoring
the voltage difference between ªDriver Belt Highº and
ªDriver Belt Lowº, the SDM calculates the combined
resistance of the driver pretensioner assembly, harness
wiring IB13±BLU/RED and IB14±BLU/YEL, and
connector terminal contact.
DTC Will Set When:
The combined resistance of the driver pretensioner
assembly, harness wiring IB13±BLU/RED and
IB14±BLU/YEL, 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 41.
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 driver seat.
4. This test checks for proper contact and/or corrosion
of the 2±pin connector terminals at the base of the
driver seat.
5. This test isolate the malfunction to one side of the
pretensioner assembly yellow 2±pin connector
located at the base of the driver seat.
6. This test determines whether the malfunction is due
to high resistance in the wiring.