1995 ISUZU TROOPER Workshop Manual

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Page 1697 of 1928

ISUZU TROOPER 1995 Workshop Manual Supplemental Restraint System 9J-73

DTC28
CURRENT SINK OR SOURCE FAILURE
STEP
ACTION YES NO
1 WAS THE "SRS
DIAGNOSTIC
SYSTEM
CHECK" GOTOSTEP2. GO TO THE "SRS
PERFORMED? DIAGNOSTIC
SYSTE

Page 1698 of 1928

$ISUZU TROOPER 1995 Workshop Manual 9J-74 Supplemental Restraint System ---~ DTC31 \" DRIVER LOOP ENERGY RESERVE FEED OPEN CIRCUIT DESCRIPTION During the "Continuous Monitoring" tests the DERM monitors the voltage at "D$

9J-74 Supplemental Restraint System
---~

DTC31 \"'
DRIVER LOOP ENERGY RESERVE FEED OPEN
CIRCUIT DESCRIPTION
During the "Continuous Monitoring" tests the DERM
monitors the
voltage at "Driver Source Sense" terminal
"AS." When the circuit is operating normally the
measured voltage will be slightly less than "Driver 36
VLR."
If the "Driver 36 VLR" circuit opens the voltage
measured at "Driver Source Sense" will decrease to
slightly less than "Ignition 1" voltage. When the voltage
measured at "Driver Source Sense" is within a specified
range of
"Ignition 1" for SOO milliseconds DTC 31 is set.
DTC WILL SET WHEN
The voltage measured at "Driver Source Sense" terminal
"AS"
is within a specified range of "Ignition 1" for SOO
milliseconds. This test is run every 100 milliseconds
during "Continuous Monitoring" tests.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamps and sets
a diagnostic
trouble code.
DTC WILL CLEAR WHEN
The voltage measured at "Driver Source Sense" terminal
"AS"
is outside the specified range of "Ignition 1" which
sets the diagnostic
trouble code, for SOO milliseconds.
TO IGNITION SWITCH
FUSE! SRS C-24 lOA , ... R D
FUSE SRS C-23 IDA , ...
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test checks for an open in the "Driver 36VLR"
circuit.
3. This test checks for a high resistance, but not an
open, in the "Driver Source Sense" circuit.
4. This test checks for a short from the "Driver Source
Sense" circuit to 8+.
s. This test determines whether the malfunction is due
to the
dual pole arming sensor.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor
connection at arming sensor
terminal "4" or "6", poor
connection at DERM
terminal "A4" or "AS", an open in
CKT 1811 or CKT 1812, or an open inside the dual pole
arming sensor.
IGNITION1
IGNITION1
DRIVER SOURCE SENSE DRIVER 38VLR PASS.3eVLR PASS. SOURCE SENSE
PASS SIDE HIGH
PASS SIDE LOW
SPARE/LPS
SERIAL DATA
SRS INDICATOR
..

Page 1699 of 1928

ISUZU TROOPER 1995 Workshop Manual Supplemental Restraint System 9J-75
DTC31
DRIVER LOOP ENERGY RESERVE FEED OPEN
STEP ACTION YES NO
1 WAS THE "SRS
DIAGNOSTIC SYSTEM CHECK GOTOSTEP2. GO TO THE "SRS
PERFORMED? DIAGNOSTIC
S

Page 1700 of 1928

ISUZU TROOPER 1995 Workshop Manual 9J-76 Supplemental Restraint System
DTC34
DUAL POLE ARMING SENSOR IGNITION FEED OPEN
CIRCUIT DESCRIPTION
During the "turn-ON" tests, performed at the beginning
of each ignition cycle, th

9J-76 Supplemental Restraint System
DTC34
DUAL POLE ARMING SENSOR IGNITION FEED OPEN
CIRCUIT DESCRIPTION
During the "turn-ON" tests, performed at the beginning
of each ignition cycle, the DERM delays the charging of
the
"Driver 36 VLR" and "Passenger 36 VLR" power
supplies.
While the delay is active the DERM measures
the voltage at the "Driver VLR" terminal "A4" ,
"Passenger 36 VLR" terminal "A3", "Driver Source
sense" terminal "AS", and "Passenger Source Sense"
terminal "A6". When the voltage measured at the two "36
VLR" power supplies indicates they are in a discharged
state and the voltage measured at each
"Source Sense"
terminal is a specified amount below "Ignition 1" voltage
DTC34 is set.
DTC WILL SET WHEN
With both "36 VLR" power supplies in a discharged state,
the voltage measured at "Driver
Source Sense" terminal
"AS" and "Passenger Source Sense" terminal "A6" are
simultaneously a specified amount below
"Ignition 1"
voltage and no "higher priority faults" are detected. This
test is run once each ignition cycle during the "Turn-ON"
tests while the "36
VLR Delay" is active.
ACTION TAKEN
DERM turns "ON" the AIR BAG" warning lamp and sets
a diagnostic trouble code.
DTC WILL CLEAR WHEN
With both "36 VLR" power supplies in a discharged state,
the voltage measured at specified range of
"Ignition 1"
voltage. When
neither the failure nor clear conditions are met, the
state of the diagnostic trouble code from the previous
ignition cycle is used.
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test checks for an open in the "Ignition 1" circuit
between the
splice and the dual pole arming sensor.
3. This test determines whether the malfunction is
internal to the dual pole arming sensor.
4. This test checks for an open in fuse C-24.
s. This test checks for a short from CKT 1809 to ground.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by an
improper connection at dual pole arming sensor terminal
"3" or "6" and "7" improper connection at DERM terminal
"AS" or "A6", open ignition feed to the dual pole arming
sensor, open "Driver
Source Sense" circuit and open
"Passenger
Source Sense" circuit, or malfunctioning
dual pole arming sensor ignition diodes. The test for this
diagnostic trouble code is only run while the "AIR
BAG"warning lamp is performing the bulb check. When
a scan tool "Clear Code" command is issued and the
malfunction
is still present, the DTC will not reappear
until the ignition switch is turned
"OFP' for at least two
minutes with the entire
SRS connected and then the
ignition switch is turned
"ON."
Ill

Page 1701 of 1928

ISUZU TROOPER 1995 Workshop Manual Supplemental Restraint System 9J-77
DTC34
-" DUAL POLE A MING SENSOR IGNITION FEED OPEN
STEP
ACTION YES NO
1 WAS THE "SRS
DIAGNOSTIC SYSTEM CHECK" GOTOSTEP2. GO TO THE "SRS
PERFORMED? DIA

Page 1702 of 1928

ISUZU TROOPER 1995 Workshop Manual 9J-78 Supplemental Restraint System
DTC35 ~
DISCRIMINATING SENSOR OPEN OR MISSING
CIRCUIT DESCRIPTION
During normal, non-deployment operation of SRS a
small amount of current flows through b

9J-78 Supplemental Restraint System
DTC35 ~
DISCRIMINATING SENSOR OPEN OR MISSING
CIRCUIT DESCRIPTION
During normal, non-deployment operation of SRS a
small amount of current flows through both the driver and
passenger deployment loops.The diagnostic resistors
within the dual pole arming sensor and the discriminating
sensors along with the resistance of the inflator modules
cause voltage drops within the deployment loops.The
DERM monitors the voltage at "Driver Side
Low" terminal
"B8" and "Passenger Side Low" terminal "B7' to detect
shorts or opens within the deployment loops.When the
measured voltage at either terminal is within a specified
percentage of its respective
"36 VLR" power supply
voltage for
500 milliseconds DTC 35 is set.
DTC WILL SET WHEN
The voltage measured at "Driver Side Low" terminal "B8"
and "Passenger Side Low" terminal "B7" is within a
specified percentage
of its respective "36 VLR"a power
supply voltage for
500 milliseconds. This test is run every
1
00 milliseconds during the "Continuous Monitoring"
tests.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
a diagnostic trouble code.
...
DTC WILL CLEAR WHEN
The voltages measured at "Driver Side Low" terminal
"B8" and "Passenger Side Low" terminal "B7" are both
above or
below the respective "36 VLR" power supply
voltage which sets
DTC 35.
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test checks for an open inside the forward LH
discriminating sensor.
3. This test checks for an open inside the
Eng-ROOM(forward LH discriminating sensor
Jumper) HARNESS.
4. This test checks for an open inside the forward RH
discriminating sensor.
5. This test checks for an open inside the Engine room
(forward
RH Discriminating Sensor Jumper)
DIAGNOSTIC AIDS
An intermittent condition is likely to be an improper
connection at any of the discriminating sensor terminals,
an open in either ground feed to the discriminating
sensors,
an open discriminating sensor interconnect
ciircuit, increased resistance
of any discriminating
sensor or decreased resistance of the dual pole arming
sensor.
SRS-1 JOINT CONNECTION ,, .
DRIVER 38VLA PASS. 38VLA PASS. SOURCE SENSE
REDUNDAT INDICATOR GROUND
PASS SIDE HIGH
f---""------o~---4--'T--:f----7-------'..,_-BLKJBLU f---.!W...----o~---4--'T--:)--ITO ~~tc~~BLU
N-:1~i7-7?--.J!2!L--wHTI!'ED Al~L __..Jlli__ BAN CONNECTOR 111t
SERIAL DATA
DRIVER SIDE HIGH DRIVER SIDE lOW REDUNDANT INDICATOR IGNffiON 1
..

Page 1703 of 1928

ISUZU TROOPER 1995 Workshop Manual Supplemental Restraint System 9J-79
,~DTC35
DISCRIMINATING SENSOR OPEN OR MISSING
STEP ACTION YES NO
1 WAS THE "SRS DIAGNOSTIC SYSTEM CHECK" PERFORMED? GOTOSTEP2. GO TO THE "SRS DIAGNOSTIC SYSTEM

Supplemental Restraint System 9J-79
,~DTC35
DISCRIMINATING SENSOR OPEN OR MISSING
STEP ACTION YES NO
1 WAS THE "SRS DIAGNOSTIC SYSTEM CHECK" PERFORMED? GOTOSTEP2. GO TO THE "SRS DIAGNOSTIC SYSTEM CHECK."
2 WHEN MEASUREMENTS ARE REQUESTED IN THIS CHART USE J-39200 DVM WITH GOTOSTEP3. GOTOSTEP7. CORRECT TERMINAL ADAPTER FROM J-35616-A. DISCONNECT DRIVER AND PASSENGER INFLATOR MODULES, YELLOW 2-WAY OR 4-WAY CONNECTORS LOCATED AT THE TOP OF THE STEERING COLUMN AND BEHIND THE 1/P COMPONENT DOOR ASSEMBLY. DISCONNECT FORWARD LH DISCRIMINATING SENSOR. CHECK FOR PROPER CONNECTION TO FORWARD LH DISCRIMINATING SENSOR AT TERMINALS "1" AND "2". IF OK THEN MEASURE RESISTANCE ON FORWARD DISCRIMINATING SENSOR FROM TERMINAL "1" TO TERMINAL "2". IS RESISTANCE LESS THAN 8.54K.Cl?
3 RECONNECT FORWARD LH DISCRIMINATING SENSOR. GOTOSTEP4. GOTOSTEP8. DISCONNECT ENG·ROOM(FORWARD LH DISCRIMINATING SENSOR JUMPER) CHECK FOR PROPER CONNECTION TO ENGINE ROOM (FORWARD LH DISCRIMINATING SENSOR JUMPER) HARNESS CONNECTOR AT TERMINAL "1" AND "2". IF OK THEN. MEASURE RESISTANCE OH ENG·ROOM FORWARD LH DISCRIMINATING SENSOR JUMPER) HARNESS CONNECTOR FROM TERMINAL "1" TO TERMINAL "2". IS RESISTANCE LESS THAN 8.540?
4
RECONNECT ENGINE ROOM (FORWARD LH DISCRININATING SENSOR JUMPER) GOTOSTEP5. GO TO STEPS. HARNESS CONNECTOR. DISCONNECT FORWARD RH DISCRIMINATING SENSOR. CHECK FOR POWER CONNECTION TO FORWARD RH DISCRIMINATING SENSOR AT TERMINALS "1" AND TERMINAL "2". IF OK THEN MEASURE RESISTANCE ON FORWARD RH DISCRIMINATING SENSOR FROM TERMNAL "1" TO TERMINAL "2". IS RESISTANCE LESS THAN 8.540?
5 RECONNECT FORWARD RH DISCRIMINATING SENSOR. DISCONNECT ENGINE ROOM GOTOSTEP6. GO TO STEP10. (FORWARD RH DISCRIMINATING SENSOR JUMPER) CHECK FOR PROPER CONNECTION TO ENGINE ROOM (FORWARD RH DISCRIMINATING SENSOR JUMPER) HARNESS CONNECTOR AT TERMINALS "1" AND "2".1F OK THEN. MEASURE RESISTANCE ON ENG·ROOM(FORWARD RH DISCRIMINATING SENSOR JUMPER) HARNESS CONNECTOR FROM TERMINAL "1" TO TERMINAL "2". IS RESISTANCE LESS THAN 8.540?
6 REPLACE SRS HARNESS. GOTOSTEP11.
7 REPLACE FORWARD LH DISCRIMINATING SENSOR. GOTOSTEP11.
8 REPLACE ENG.ROOM(FORWARD LH DISCRIMINATING SENSOR JUMPER) HARNESS. GOTOSTEP11.
9 REPLACE FORWARD RH DISCRIMINATING SENSOR. GOTOSTEP11.
10 REPLACE ENG·ROOM(FORWARD RH DISCRIMINATING SENSOR JUMPER) HARNESS. GOTOSTEP11.
11 RECONNECT ALL SRS COMPONENTS ENSURE ALL COMPONENTS ARE PROPERLY GO TO THE "SRS DIAGNOSTIC SYSTEM CHECK" MOUNTED. CLEAR SRS DIAGNOSTIC TROUBLE CODES. REPEAT THE "SRS DIAGNOSTIC SYSTEM CHECK."

Page 1704 of 1928

ISUZU TROOPER 1995 Workshop Manual 9J-80 Supplemental Restraint System
DTC36
PASSENGER LOOP ENERGY RESERVE FEED OPEN
CIRCUIT DESCRIPTION
During the "Continuous Monitoring" tests the DERM
monitors the voltage at
"Passenger S

9J-80 Supplemental Restraint System
DTC36
PASSENGER LOOP ENERGY RESERVE FEED OPEN
CIRCUIT DESCRIPTION
During the "Continuous Monitoring" tests the DERM
monitors the voltage at
"Passenger Source Sense"
terminal "AS". When the circuit is operating normally the
measured voltage
will be slightly less than "Passenger
3S VLR." If the "Passenger 3S VLR" circuit opens the
voltage measured at
"Passenger Source Sense" will
decrease to slightly less than "Ignition 1" voltage. When
the voltage measured at
"Passenger Source Sense" is
within a specified range of "Ignition 1" for 500
milliseconds DTC 3S is set.
DTC WILL SET WHEN
The voltage measured at "Passenger Source Sense"
terminal "AS" is within a specified range of "Ignition 1" for
500 milliseconds. This test is run every 100 milliseconds
during "Continuous Monitoring" tests.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
diagnostic trouble code.
DTC WILL CLEAR WHEN
The voltage measured at "Passenger Source Sense"
terminal "AS" is outside the specified range of "Ignition 1"
which sets the diagnostic trouble code, for 500
milliseconds.
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test checks for an open in the "Passenger 3S
VLR" circuit.
3. This test determines whether the malfunction is due
to high resistance
in the "Passenger Source Sense"
circuit.
4. This test checks for a short from the
"Passenger
Source Sense"
circuit to B+.
5. This test determines whether the malfunction is due
to a malfunction within the dual pole arming sensor.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor
connection at dual pole arming sensor terminal
"1" or "5",
poor connection at DERM terminal "A3" or" AS", an open
in CKT 1813 or CKT 1814 or an open inside the dual pole
arming sensor.
SAS·l
JOINT CONNECTION ,.,. " IGNITION 1
DRIVER 38VLR PASS.38VLR PASS. SOURCE SENSE
PASS SIDE HIGH PASS SIDE LOW
SERIAL DATA
SRS INDICATOR
..

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