1998 ISUZU TROOPER Service Repair Manual

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Page 3497 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±10
Chart C ªAIR BAGº Warning Lamp Does Not Come ªONº Steady
D09RW014
Circuit Description:
When the ignition switch is first turned ªONº, ªIgnition 1º
voltage is

Page 3498 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±11
RESTRAINT CONTROL SYSTEM
Chart C ªAIR BAGº Warning Lamp Does Not Come ªONº Steady
StepActionYe sNo
11. When measurements are requested in this chart,use
5±8840±0285±0 DVM with correct

9J1±11
RESTRAINT CONTROL SYSTEM
Chart C ªAIR BAGº Warning Lamp Does Not Come ªONº Steady
StepActionYe sNo
11. 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. Remove and inspect ªC±10º fuse (meter) to the ªAIR BAGº
warning lamp.
Is fuse good?
Go to Step 2Go to Step 7
21. Ignition switch ªOFF.º
2. Disconnect SRS coil and passenger air bag assemblies.
Yellow 2±pin connector located at base of steering column and
behind the glove box assembly.
3. Disconnect SDM.
4. Ignition switch ªON.º
5. Measure voltage on SDM harness connector from terminal ª7º
to terminal ª6º (ground).
Is system voltage present on terminal ª7º?
Go to Step 4Go to Step 3
31. Ignition switch ªOFF.º
2. Remove instrument meter cluster.
3. Check for proper connection to instrument cluster at
IB04±WHT/RED terminal.
4. If ok, then remove and inspect ªAIR BAGº bulb.
Is bulb good?
Go to Step 5
Replace bulb
Go to Step 6
41. Ignition switch ªOFF.º
2. Disconnect instrument meter cluster harness connector.
3. Ignition switch ªON.º
4. Measure voltage on SDM harness connector from terminal ª7º
to terminal ª6º (GROUND).
Is voltage 1 volt or less?
Go to Chart A
Replace SRS
harness
Go to Step 6
51. Install bulb.
2. Measure resistance from instrument meter cluster harness
connector IB04±WHT/RED terminal to SDM harness
connector terminal ª7º.
Is resistance 5.0 ohms or less?Service
instrument meter
cluster
Install instrument
meter cluster
Go to Step 6
Replace SRS
harness
Go to Step 6
6Reconnect all SRS components, ensure all components are
properly mounted.
Was this step finished?Repeat the ªSRS
Diagnostic
System Checkº
Go to Step 6
7Perform chart C.
Was this step finished?
Go to Step 8Go to Step 1
81. Replace ªC±10º fuse.
2. Ignition switch ªONº wait 10 Seconds then ignition switch ªOff.º
3. Remove and inspect ªC±10º fuse.
Is fuse good?
Install ªC±10º
fuse
Go to Step 10
Go to Step 9

Page 3499 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±12
Chart C ªAIR BAGº Warning Lamp Does Not Come ªONº Steady (Contd)
StepNo Ye s Action
91. Disconnect SRS coil and passenger air bag assemblies.
Yellow 2±pin conn

Page 3500 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±13
RESTRAINT CONTROL SYSTEM
DTC 15 Passenger Deployment Loop Resistance High
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose criti

9J1±13
RESTRAINT CONTROL SYSTEM
DTC 15 Passenger 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. ªPassenger Bag Lowº terminal ª16º is grounded
through a resister and the passenger current source
connected to ªPassenger Bag Highº terminal ª15º allows a
known amount of current to flow. By monitoring the
voltage difference between ªPassenger Bag Highº and
ªPassenger Bag Lowº the SDM calculates the combined
resistance of the passenger air bag assembly, harness
wiring IB07±YEL/GRN and IB08±YEL/RED connector
terminal contact.
DTC Will Set When:
The combined resistance of the passenger air bag
assembly, harness wiring IB07±YEL/GRN and
IB08±YEL/RED, 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 air
bag 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 ª15º and
ª16º, or a poor wire to terminal connection in
IB07±YEL/GRN and IB08±YEL/RED. This test for this
diagnostic trouble code is only run while the ªAIR BAGº

Page 3501 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±14
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 stillpresent

RESTRAINT CONTROL SYSTEM 9J1±14
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 stillpresent, the DTC will not reappear until the next ignition
cycle.
DTC 15 Passenger Deployment 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
deployment loop resistance.
Is passenger resist. more than 2.9 ohms?
Go to Step 3Go to Chart A
31. Ignition switch ªOff.º
2. Make sure the passenger air bag assembly yellow 2±pin
connector located behind the glove box assembly is seated
properly.
Is the yellow 2±pin connector connected properly?
Go to Step 4
Seat passenger
Air Bag assembly
yellow 2±pin
connector
properly
Go to Step 7
41. Disconnect and inspect the passenger air bag assembly
yellow 2±pin connector located behind the glove box
assembly.
2. If ok, reconnect the passenger air bag assembly 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 15 current?
Go to Step 5Go to Step 7
51. Ignition switch ªOff.º
2. Disconnect SRS coil and passenger air bag assembly, yellow
2±pin connector located at the base of the steering column and
behind the glove box assembly.
3. Connect 5±8840±2421±0 SRS driver / passenger load tool
and appropriate adapters to SRS coil and passenger air bag
assembly harness connectors.
4. Ignition switch ªON.º
Is DTC 15 Current?
Go to Step 6
Ignition switch
ªOffº
Replace the
passenger air
bag assembly
Go to Step 7
61. Ignition switch ªOff.º
2. There has been an increase in the total circuit resistance of the
passenger inflator deployment loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB07±YEL/GRN and IB08±YEL/RED, and SDM
connector terminal ª15º and ª16º to locate the root cause.
Was a fault found?
Replace SRS
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 3502 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±15
RESTRAINT CONTROL SYSTEM
DTC 16 Passenger Deployment loop Resistance Low
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critic

9J1±15
RESTRAINT CONTROL SYSTEM
DTC 16 Passenger 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. ªPassenger Bag Lowº terminal ª16º is grounded
through a resistor and the passenger current source
connected to ªPassenger Bag Highº terminal ª15º allows a
known amount of current to flow. By monitoring the
voltage difference between ªPassenger Bag Highº and
ªPassenger Bag Lowº, the SDM calculates the combined
resistance of the passenger air bag assembly, harness
wiring IB07±YEL/GRN and IB08±YEL/RED connector
terminal contact.
DTC Will Set When:
The combined resistance of the passenger air bag
assembly, harness wiring IB07±YEL/GRN and
IB08±YEL/RED, 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 air bag
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 IB07±YEL/GRN and IB08±YEL/RED, or a
malfunctioning shorting clip on the passenger air bag
assembly which would require replacement of the air bag
assembly. The test for this diagnostic trouble code is only
run while ªAIR BAGº warning lamp is performing the bulb

Page 3503 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±16
check, unless DTC 17 or DTC 26 is detected. When a
scan tool ªClear Codesº command is issued and themalfunction is still present, the DTC will not reappear until
th

RESTRAINT CONTROL SYSTEM 9J1±16
check, unless DTC 17 or DTC 26 is detected. 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 16 Passenger Deployment 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 deployment 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 air bag assembly yellow 2±pin
connector located behind the glove box assembly is seated
properly.
Is the yellow 2±pin connector connected properly?
Go to Step 4
Seat passenger
air bag assembly
yellow 2±pin
connector
properly
Go to Step 7
41. Disconnect and inspect the passenger air bag assembly
yellow 2±pin connector located behind the glove box
assembly.
2. If ok, reconnect the passenger air bag assembly 2±pin
connector.
3. Ignition switch ªON.º
Is DTC 16 Current?
Go to Step 5Go to Step 7
51. Ignition switch ªOff.º
2. Disconnect SRS coil and passenger air bag assembly, yellow
2±pin connector located at the base of the steering column and
behind the glove box assembly.
3. Connect 5±8840±2421±0 SRS driver/passenger load tool and
appropriate adapters to SRS coil and passenger air bag
assembly harness connectors.
4. Ignition switch ªON.º
Is DTC 16 current?
Go to Step 6
Ignition switch
ªOffº
Replace the
passenger air
bag assembly
Go to Step 7
61. Ignition switch ªOff.º
2. There has been a decrease in the total circuit resistance of the
passenger inflator deployment loop.
3. Use the high resolution ohmmeter mode of the DVM while
checking IB07±YEL/GRN and IB08±YEL/RED, and SDM
connector terminal ª15º and ª16º to locate the root cause.
Was a fault found?
Replace SRS
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 3504 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±17
RESTRAINT CONTROL SYSTEM
DTC 17 Passenger Deployment Loop Open
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunc

9J1±17
RESTRAINT CONTROL SYSTEM
DTC 17 Passenger 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 flowing in the deployment loop. This produces
proportional voltage drops in the loop. By monitoring the
voltage difference between ªPassenger Bag Highº and
ªPassenger Bag Lowº, the SDM calculates the combined
resistance of the passenger air bag assembly, harness
wiring IB07±YEL/GRN AND IB08±YEL/RED, and
connector terminal contact.
DTC Will Set When:
The voltage difference between ªPassenger Bag Highº
terminal ª15º and ªPassenger Bag Lowº terminal ª16º 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 Bag Highº
terminal ª15º and ªPassenger Bag Lowº terminal ª16º is
below 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 air
bag 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 air bag assembly harness
connector terminalsª2º and ª3º, SDM terminals ª15º and
ª16º, or an open in IB07±YEL/GRN and IB08±YEL/RED.

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