1998 ISUZU TROOPER Service Repair Manual

fuel wipers trailer climate control coolant level keyless entry

Page 3505 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±18
DTC 17 Passenger Deployment Loop Open
StepActionYe sNo
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System Checkº
21.

RESTRAINT CONTROL SYSTEM 9J1±18
DTC 17 Passenger Deployment 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 differential voltage.
Is passenger VDIF 0.425 volts or more?
Go to Step 3Go to Chart A
31. Ignition switch ªOFFº.
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 ªONº.
Is DTC 17 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 17 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 open circuit resistance in the passenger
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?
Go to the ªSRS
Diagnostic
System Checkº
Go to Step 7

Page 3506 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±19
RESTRAINT CONTROL SYSTEM
DTC 18 Passenger Deployment Loop Short To Ground
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose criti

Page 3507 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±20
DTC 18 Passenger Deployment Loop Short To Ground
StepActionYe sNo
1Was the ªSRS Diagnostic System Checkº performed?
Go to Step 2
Go to the ªSRS
Diagnostic
System C

Page 3508 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±21
RESTRAINT CONTROL SYSTEM
DTC 19 Passenger Deployment Loop Short To B+
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical

Page 3509 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±22
DTC 19 Passenger Deployment Loop Short To B+
CAUTION: When DTC 19 has been set, it is necessary to replace the SDM. Setting DTC 19 will also cause DTC
71 to set. Wh

RESTRAINT CONTROL SYSTEM 9J1±22
DTC 19 Passenger Deployment Loop Short To B+
CAUTION: When DTC 19 has been set, it is necessary to replace the SDM. Setting DTC 19 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
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 bag sense LO.
Is passenger bag sense LO more than 3.5 volts?
Go to Step 3Go to Chart A
31. Ignition switch ªOFFº.
2. Disconnect passenger air bag assembly yellow 2±pin
connector behind the glove box assembly.
3. Leave driver air bag 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 passenger bag sense LO more than 3.5 volts?
Go to Step 4
Ignition switch
ªOFFº
Replace
passenger air
bag 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 from terminal
ª15º 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
ª16º 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. Ignition switch ªONº.
Is passenger bag senslo less than 3.5 volts?Ignition switch
ªOFFº
Replace SDM
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 3510 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±23
RESTRAINT CONTROL SYSTEM
DTC 21 Driver Deployment Loop Resistance High
D09RW014
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical

9J1±23
RESTRAINT CONTROL SYSTEM
DTC 21 Driver 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 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 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 IB05±YEL and
IB06±YEL/BLK, 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 21.
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 steering column.
4. This test checks for proper contact and/or corrosion
of the 2±pin connector terminals at the base of
steering column.
5. This test isolate the malfunction to one side of the
SRS coil assembly yellow 2±pin connector located
at the base of the steering column.
6. This test determines whether the malfunction is due
to high resistance in the wiring.
7. This test determines whether the malfunction is in
the SRS coil assembly or the driver air bag
assembly.

Page 3511 of 3573

ISUZU TROOPER 1998 Service Repair Manual RESTRAINT CONTROL SYSTEM 9J1±24
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at terminals ª1º and ª2º of the SRS coil 2±pin
connector at the base of the

RESTRAINT CONTROL SYSTEM 9J1±24
Diagnostic Aids:
An intermittent condition is likely to be caused by a poor
connection at terminals ª1º and ª2º of the SRS coil 2±pin
connector at the base of the steering column, terminal ª1º
and ª2º of the driver air bag assembly 2±pin connector at
the top of the steering column, SDM terminals ª3º and ª4º
or a poor wire to terminal connection in IB05±YEL orIB06±YEL/BLK. 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.
DTC 21 Driver Deployment 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
deployment loop resistance.
Is driver resistance more than 3.7 ohms?
Go to Step 3Go to Chart A
31. Ignition switch ªOFF.º
2. Disconnect SRS coil 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 5Go to Step 8
51. Ignition switch ªOFF.º
2. Disconnect SRS coil and passenger air bag assembly, yellow
2±pin connector located at the base of steering column and
behind the glove box assembly.
3. Connect SRS driver / passenger load tool 5±8840±2421±0
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 6Go 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 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

Page 3512 of 3573

ISUZU TROOPER 1998 Service Repair Manual 9J1±25
RESTRAINT CONTROL SYSTEM
DTC 21 Driver Deployment Loop Resistance High (Contd)
StepNo Ye s Action
71. Ignition switch ªOFF.º
2. Disconnect SRS driver / passenger load tool from SRS coil
as

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