1998 ISUZU TROOPER Service Repair Manual

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Page 3529 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±42
DTC 71 Internal SDM Fault
WARNING:DURING SERVICE PROCEDURES. BE VERY CAREFUL WHEN HANDLING A SENSING AND
DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR JAR THE SDM. NEVER

Page 3530 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±43
RESTRAINT CONTROL SYSTEM
DTC 29 Passenger Pretensioner Loop Short To Ground
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose cri

Page 3531 of 3573

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

Page 3532 of 3573

ISUZU TROOPER 1998 Service Repair Manual 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 cri

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

Page 3533 of 3573

ISUZU TROOPER 1998 Service Repair Manual 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

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

Page 3534 of 3573

ISUZU TROOPER 1998 Service Repair Manual 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 crit

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

Page 3535 of 3573

ISUZU TROOPER 1998 Service Repair Manual 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
c

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

Page 3536 of 3573

ISUZU TROOPER 1998 Service Repair Manual 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 cr

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