ISUZU TROOPER 1998 Service Repair Manual

RESTRAINT CONTROL SYSTEM 9J1±54
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at terminals ª3º and ª4º of the driver
pretensioner assembly 2±pin connector at the base of the
driver seat. SDM terminals ª21º and ª22º or a poor wire to
terminal connection in IB13±BLU/RED orIB14±BLU/YEL. The test for this diagnostic trouble code
is only run while the ªAIR BAGº warning lamp is
performing the bulb check. 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 41 Driver Pretensioner 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
pretensioner loop resistance.
Is driver resistance more than 3.7 ohms?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Disconnect driver pretensioner assembly yellow 2±pin
connector located at base of the driver seat.
Is the 2±pin connector connected properly?
Go to Step 4
Driver
pretensioner
assembly 2±pin
connector
properly
Go to Step 7
41. Disconnect and inspect the driver pretensioner assembly
yellow 2±Pin connector located base of the driver seat.
2. If ok, reconnect the driver pretensioner assembly yellow 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 41 current?
Go to Step 5Go to Step 7
51. Ignition switch ªOFF.º
2. Disconnect driver pretensioner assembly, yellow 2±pin
connector located at the base of the driver seat.
3. Connect SRS driver / passenger load tool 5±8840±2421±0
and appropriate adapter to driver pretensioner assembly
harness connectors.
4. Ignition switch ªON.º
Is DTC 41 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 pretensioner loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB13±BLU/RED and IB14±BLU/YEL, and SDM
connector terminal ª21º and ª22º 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±55
RESTRAINT CONTROL SYSTEM
DTC 42 Driver 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 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 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 42.
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 driver seat.
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
pretensioner assembly yellow 2±pin connector
located at the base of driver seat.
6. This test determines whether the malfunction is due
to shortening in the wiring.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
between IB13±BLU/RED or IB14±BLU/YEL or a
malfunctioning shorting clip on the driver pretensioner
assembly which would require replacement of the
component. The test for this diagnostic trouble code is

RESTRAINT CONTROL SYSTEM 9J1±56
only run while the ªAIR BAGº warning lamp is performing
the bulb check. When a scan tool ªClear Codesºcommand is issued and the malfunction is still present,
the DTC will not reappear until the next ignition cycle.
DTC 42 Driver Pretensioner 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
pretensioner loop resistance.
Is driver pretensioner loop resistance less than 1.4 OHMS?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Make sure the driver pretensioner assembly yellow 2±pin
connector located at the base of the driver seat is connected
properly.
Is the 2±pin connector connected properly?
Go to Step 4
Seat driver
pretensioner
assembly 2±pin
connector
properly
Go to Step 7
41. Disconnect and inspect the driver pretensioner assembly
yellow 2±pin connector located base of the driver seat.
2. If ok, reconnect the driver pretensioner assembly yellow 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 42 current?
Go to Step 5Go to Step 7
51. Ignition switch ªOFF.º
2. Disconnect driver pretensioner assembly, yellow 2±pin
connector located at the base of driver seat.
3. Connect SRS driver / passenger load tool 5±8840±2421±0
and appropriate adapter to driver pretensioner assembly
harness connectors.
4. Ignition switch ªON.º
Is DTC 42 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 pretensioner loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB13±BLU/RED and IB14±BLU/YEL, and SDM
connector terminal ª21º and ª22º 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±57
RESTRAINT CONTROL SYSTEM
DTC 44 Driver 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 following in the pretensioner loop.
This produces proportional voltage drops in the loop. 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 voltage difference between ªDriver Belt Highº
terminal ª21º and ªDriver Belt Lowº terminal ª22º 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 Belt Highº
terminal ª21º and ªDriver Belt Lowº terminal ª22º is belowa 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 at the base of the driver seat.
4. This test checks for proper contact and/or corrosion
of the yellow 2±pin connector at the base of the
driver seat.
5. This test isolates the malfunction to one side of the
driver pretensioner assembly yellow 2±pin
connector located at the base of driver seat.
6. This test determines whether the open is in the
wiring.
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at the driver pretensioner assembly harness
2±pin connector terminals ª3º and ª4º at the top of the
steering column, SDM terminals ª21º and ª22º, or an open
in IB13±BLU/RED and IB14±BLU/YEL.

RESTRAINT CONTROL SYSTEM 9J1±58
DTC 44 Driver 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. Use scan tool data list function, read and record the driver
pretensioner circuit differential voltage.
Is driver pretensioner VDIF more than 4.25 volts?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Make sure the driver pretensioner assembly yellow 2±pin
connector located at the base of the driver seat is seated
properly.
Is the yellow 2±pin connector connected properly?
Go to Step 4
Seat driver
pretensioner
assembly 2±pin
connector
Go to Step 7
41. Disconnect and inspect the driver pretensioner assembly
yellow 2±pin connector located base of the driver seat.
2. If ok, reconnect the driver pretensioner assembly yellow 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 44 current?
Go to Step 5Go to Step 7
51. Ignition switch ªOFFº.
2. Disconnect driver pretensioner assembly, yellow 2±pin
connectors located at the base of the driver seat.
3. Connect SRS driver/passenger load tool 5±8840±2421±0 and
appropriate adapter to driver pretensioner assembly harness
connectors.
4. Ignition switch ªON.º
Is DTC 44 current?
Go to Step 6Go to Step 7
61. Ignition switch ªOFF.º
2. There has been an open circuit in the driver pretensioner loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB13±BLU/RED and IB14±BLU/YEL, and SDM
connector terminal ª21º and ª22º 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±59
RESTRAINT CONTROL SYSTEM
DTC 45 Driver Pretensioner 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
pretensioner loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM monitors the voltage at ªDriver Belt Lowº
terminal ª22º and ªpassenger Belt Lowº terminal ª10º to
detect shorts to ground in the air bag assembly circuits.
DTC Will Set When:
Neither of the air bag and the pretensioner belt are 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 Belt Lowº is below a specified value,
DTC 45 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
driver pretensioner assembly yellow 2±pin
connector at the base of the driver seat.
4. This test determines whether the malfunction is in
IB13±BLU/RED.
5. This test determines whether the malfunction is in
IB14±BLU/YEL.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to ground in the driver pretensioner assembly circuit.
Inspect IB13±BLU/RED and IB14±BLU/YEL carefully for
cutting or chafing.

RESTRAINT CONTROL SYSTEM 9J1±60
DTC 45 Driver 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 driver belt sense LO.
Is driver belt sense LO less than 1.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Disconnect driver pretensioner assembly yellow 2±pin
connector located at base of the driver seat, leave passenger
pretensioner assembly connected.
3. Connect SRS driver / passenger load tool 5±8840±2421±0
and appropriate adapter to driver pretensioner assembly
harness connector.
4. Ignition switch ªON.º
Is DTC 45 current?
Go to Step 4Go 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 ª21º 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
ª22º 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 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±61
RESTRAINT CONTROL SYSTEM
DTC 46 Driver 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 voltage at ªDriver Belt Lowº
terminal ª22º and ªPassenger Belt Lowº terminal ª10º to
detect shorts to B+ in the pretensioner 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 Belt Lowº is above a specified value,
DTC 46 will set.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets
DTC 46.
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
driver pretensioner assembly yellow 2±pin
connector at the base of the driver seat.
4. This test determines whether the malfunction is in
IB13±BLU/RED.
5. This test determines whether the malfunction is in
IB14±BLU/YEL.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to B+ in the driver pretensioner assembly circuit. Inspect
IB13±BLU/RED and IB14±BLU/YEL carefully for cutting
or chafing. If the wiring pigtail of the driver pretensioner
assembly is damaged, the components must be
replaced. A careful inspection of IB13±BLU/RED and
IB14±BLU/YEL, including the driver pretensioner
assembly is essential to ensure that the replacement
SDM will not be damaged.

RESTRAINT CONTROL SYSTEM 9J1±62
DTC 46 Driver Pretensioner Loop Short To Ignition
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.
Ignition switch ªOFF.º
Connect scan tool data link connector. follow directions as
given in the scan tool operator's manual.
2. Ignition switch ªON.º
3. Read driver belt sense LO .
Is driver belt sense LO more than 3.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Disconnect driver pretensioner assembly yellow 2±pin
connector at the base of the driver seat, leave passenger
pretensioner assembly connected.
3. Connect SRS driver /passenger load tool 5±8840±2421±0 and
appropriate adapter to driver pretensioner assembly harness
connector.
4. Ignition switch ªON.º
Is DTC 46 current?
Go to Step 4
Ignition switch
ªOFFº
Replace driver
pretensioner
assembly
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 ª21º to
terminal ª12º (ignition).
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
ª22º to terminal ª12º (ignition).
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 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±63
RESTRAINT CONTROL SYSTEM
DTC 52 Pretensioner Deployment Event Commanded
D09RW014
Circuit Description:
The SDM contains a sensing device which converts
vehicle velocity changes to an electrical signal. The
electrical signal generated is processed by the SDM and
then compared to a value stored in memory. When the
generated signal exceeds the stored value, the SDM will
cause current to flow through the pretensioner assembly
deploying the pretensioners and causing DTC 52 to set.
DTC Will Set When:
The SDM detects a frontal crash, up to 30 degrees off the
centerline of the vehicle, of sufficient force to warrant
deployment of the air bags and pretensioner seat belt.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp records
ªCrash Dataº, and sets a diagnostic trouble code.
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. If pretensioner assembly (s) has not deployed, DTC
52 may have falsely set.
3. If DTC 52 has set with no signs of frontal impact, the
diagnostic trouble code has falsely set.