1995 ISUZU TROOPER Workshop Manual

immobilizer horn charging warning light wiper blades wheel size

Page 1689 of 1928

ISUZU TROOPER 1995 Workshop Manual STEP
21
22
23
24
25
26
27
28 29
30
31
32
Supplemental ,Restraint System 9J-65
DTC 24 {PAGE 3 OF 3)
INITIATOR CIRCUIT VOLTAGE LOW
ACTION YES NO
WERE YOU
SENT HERE FROM DTC 24(PA

STEP
21
22
23
24
25
26
27
28 29
30
31
32
Supplemental ,Restraint System 9J-65
DTC 24 {PAGE 3 OF 3)
INITIATOR CIRCUIT VOLTAGE LOW
ACTION YES NO
WERE YOU
SENT HERE FROM DTC 24(PAGE 2 OF 3)? GO TO STEP22. GO TO DTC
24(PAGE2 OF 3).
DISCONNECT DUAL POLE ARMING SENSOR. GO TO STEP23. GO TO STEP30.
MEASURE RESISTANCE ON DERM HARNESS CONNECTOR
FROM TERMINAL "A7'' TO TERMINAL "A1"(GROUND). DOES J-39200 DISPLAY "OL"(INFINITE)?
MEASURE RESISTANCE ON DERM HARNESS CONNECTOR GO TO STEP24. GO TO STEP30.
FROM TERMINAL "89"
TO TERMINAL "A1"(GROUND). DOES J-39200 DISPLAY "OL"(INFINITE)?
CHECK FOR
PROPER CONNECTION TO THE DUAL POLE GO TO STEP31. GO TO STEP25.
ARMING SENSOR AT TERMINAL "1", "2", "3", "4" AND "5".
IF OK THEN MEASURE RESISTANCE ON DUAL POLE
ARMING SENSOR CONNECTOR FROM TERMINAL "2" TO
TERMINAL "6".
IS RESISTANCE
GREATER THAN 12.9KO?
MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR GO TO STEP31. GO TO STEP26.
CONNECTOR FROM TERMINAL "1" TO TERMINAL "7". IS RESISTANCE GREATER THAN 12.9KO?
MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR
GO TO STEP27. GO TO STEP30.
CONNECTOR FROM TERMINAL "4" TO
DERM HARNESS
CONNECTOR TERMINAL "A4" IS RESISTANCE 5.00 OR
LESS?
MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR GO TO STEP28. GO TO STEP30.
CONNECTOR FROM TERMINAL "5" TO
DERM HARNESS
CONNECTOR TERMINAL "A3" IS RESISTANCE 5.00 OR
LESS?
MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR GO TO STEP29. GO TO STEP30.
CONNECTOR FROM TERMINAL "2" TO
DERM HARNESS
CONNECTOR TERMINAL "89" IS RESISTANCE 5.00 OR
LESS?
MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR GO TO CHART A. GO TO STEP30.
CONNECTOR FROM TERMINAL "7'' TO DERM HARNESS
CONNECTOR TERMINAL "A7" IS RESISTANCE 5.00 OR
LESS?
REPLACE SRS HARNESS. GOTO STEP32
REPLACE DUAL POLE ARMING SENSOR. GOTO STEP 32
RECONNECT ALL SRS COMPONENTS, ENSURE ALL GO TO THE "SRS DIAGNOSTIC SYSTEM
COMPONENTS
ARE PROPERLY MOUNTED. CHECK". CLEAR SRS DIAGNOSTIC TROUBLE CODES. REPEAT THE "SRS DIAGNOSTIC SYSTEM CHECK."

Page 1690 of 1928

ISUZU TROOPER 1995 Workshop Manual 9J-66 Supplemental Restr.aint System
DTC 25 (PAGE 1 OF 2)
INITIATOR CIRCUIT SHORT TO IGNITION
CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the
DERM grounds the
"Dri

9J-66 Supplemental Restr.aint System
DTC 25 (PAGE 1 OF 2)
INITIATOR CIRCUIT SHORT TO IGNITION
CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the
DERM grounds the
"Driver Side Low" terminal "BB" and
measures the voltage at "Driver Side Low" and
"Passenger Side Low." The DERM then grounds
"Passenger Side Low" terminal "B7" and again measures
the
voltage at "Driver Side Low" and "Passenger Side
Low."
For a properly operating circuit the voltage
measures the voltage measurements during each of
these tests
will be below a specified value. When the
voltages measured at both "Driver Side Low" and
"Passenger
Side Low'' are above a specified value during
both tests
DTC 25 is set.
DTC WILL SET WHEN
The voltages measured at both "Driver Side Low" and
"Passenger
Side Low" are above a specified value while
the DERM attempts to ground each of these terminals.
This test is run during the
"Initiator Assembly Resistance
Test" and the "1 0 Minute Loop Test" when: 1) "higher
priority
faults" are detected during ''Turn-ON", 2) No
"higher priority
faults" are detected during "continuous
Monitoring" for one second, 3) No
"Crank" signal present,
4)
"Ignition 1" voltage is above a specified value.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
a diagnostic
trouble code.
DTC WILL CLEAR WHEN
The voltages measured at either "Driver Side Low" or
"Passenger
Side Low" is below a specified value while
the DERM ground either of these terminals.
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test determines whether the malfunction is
occurring
in the steering column circuitry.
3. This test determines whether the malfunction is
occurring
in the passenger inflator module circuitry.
4. This test for a short from the SRS COIL to +B.
DIAGNOSTIC AIDS
Refer to DTC 25(Page 2 of 2).
IGNmON 1 IGNITION 1 DRIVER SOURCE SENSE
~ -
DRIVER 38VLR PASS. 38VLR PASS. SOURCE SENSE 1DA 1&14 111011 D
REDUNDAT INDICATOR GROUND
PASS SIDE HIGH
PASS SIDE LOW
SPARE/l.PS DRIVER SEAT BelT
SERIAL DATA
SRS INDICATOR

Page 1691 of 1928

ISUZU TROOPER 1995 Workshop Manual STEP
1
2
3
4 5
6
7 8
Suppl~mental Restraint System 9J·67
DTC 25 (PAGE 1 OF 2)
INITIATOR CIRCUIT SHORT TO IGNITION
ACTION
YES NO
WAS
THE "SRS DIAGNOSTIC SYSTEM CHECK" GOTOSTEP2. GO

Page 1692 of 1928

ISUZU TROOPER 1995 Workshop Manual 9J-68 Supplemental Restraint System
DTC 25 {PAGE 2 OF 2)
INITIATOR CIRCUIT SHORT TO IGNITION
CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the
DERM grounds the "Drive

9J-68 Supplemental Restraint System
DTC 25 {PAGE 2 OF 2)
INITIATOR CIRCUIT SHORT TO IGNITION
CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the
DERM grounds the "Driver
Side Low" terminal "88" and
measures the voltage at "Driver Side Low" and
"Passenger Side Low." The DERM then grounds
"Passenger Side Low" terminai"B7" and again measures
the voltage at "Driver
Side Low" and "Passenger Side
Low." For a properly operating circuit the voltage
measures the voltage measurements during each of
these tests
will be below a specified value. When the
voltages measured at both "Driver Side Low" and
"Passenger Side Low" are above a specified value during
both tests DTC 25 is set.
DTC WILL SET WHEN
The voltages measured at both "Driver Side Low" and
"Passenger Side Low" are above a specified value while
the DERM attempts to ground each of these terminals.
This test is run during the
"Initiator Assembly Resistance
Test" and the "10 Minute Loop Test'' when: 1) "higher
priority faults" are detected during
"Turn-ON", 2) No
"higher priority
faults" are detected during "continuous
Monitoring" for one second, 3) No
"Crank" signal present,
4)
"Ignition 1" voltage is above a specified value.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
a diagnostic trouble code.
....
DTC WILL CLEAR WHEN
The voltages measured at either "Driver Side Low" or
"Passenger Side Low" is below a specified value while
the DERM ground either of these terminals.
CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
1
0. This test checks for a short from the high side of the
passenger deployment loop to 8+.
11. This test checks for a short from the high side of the
passenger deployment loop to 8+.
12. This test checks for a short from the low side of the
driver deployment loop or passenger deployment
loop to B+.
DIAGNOSTIC AIDS
This diagnostic trouble code can only be set when the
malfunction is present as the ignition switch is turned
"ON." After the "Initiator Assembly Resistance Test" is
completed a short to B+ in the steering column, CKT
1819, CKT 1820 or CKT 1824
will cause DTC 24 to set.
When a scan tool "Clear Codes" command is issued and
the malfunction is
still present, the DTC will not reappear
for ten minutes or until the next ignition cycle.
SRS-1 JOINT CONNECTlON ,l 10 1101 ERM
PASS.3eVLR PASS. SOURCE SENSE
PASS SIDe HIGH PASS SIDe LOW
SERIAL DATA
SRS INDICA TOR
II

Page 1693 of 1928

ISUZU TROOPER 1995 Workshop Manual Supplemental Restrai~t System 9J-69

DTC 25 {PAGE 2 OF 2)
INITIATOR CIRCUIT SHORT TO IGNITION
STEP ACTION YES NO
9 WERE YOU SENT HERE FROM DTC 25(PAGE 1 OF 2)? GO TO STEP1 0. GO TO DTC
2

Page 1694 of 1928

ISUZU TROOPER 1995 Workshop Manual 9J-70 Supplemental Restraint System
DTC26
DRIVER INITIATOR CIRCUIT OPEN
CIRCUIT DESCRIPTION
When there is an open in the driver inflator module or the
SRS coil assembly the resistance betwe

9J-70 Supplemental Restraint System
DTC26
DRIVER INITIATOR CIRCUIT OPEN
CIRCUIT DESCRIPTION
When there is an open in the driver inflator module or the
SRS coil assembly the resistance between "Driver Side
High" terminal "89" and "Driver Side Low" terminal "88"
increases. This causes a larger voltage drop from the
"Driver
Side High" to the "Driver Side Low" across a
resistor inside the DERM which connects these two
terminals together. The increase in the voltage difference
between "Driver
Side High" and "Driver Side Low" is
detected by the DERM during the "Continuous
Monitoring" tests and DTC 26 is sets.
DTC WILL SET WHEN
The voltage difference between "Driver Side High"
terminal "89" and "Driver Side Low" terminal "88" is
above or
equal to a specified value for 500 milliseconds.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
a diagnostic
trouble code.
TO IGNITION FUSE SRS C-23 lOA , ...
DTC WILL TEST WHEN
The voltage difference between "Driver Side High"
terminal "89" and "Driver Side Low" terminal "88" is
below a specified value for 500 milliseconds.
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 driver inflator module.
3. This test determines whether the malfunction is in
the SRS coil assembly.
4. This test determines whether the malfunction is in
the SRS HARNESS.
DIAGNOSTIC AIDS
This diagnostic trouble code will only set when there is
an improper connection of either the
yellow 2-way
connector near the base of steering column or the yellow
2-way connector at the top of the steering column, an
open SRS coil assembly or an open inflator module.
SRS·l
JOINT CONNECTION ,.,. IGNITION 1 SWITCH
FUSE~
1GrJ;~ION-- SRS C-24 lOA , ... R D
I----'18"'34'----T---7-3--7-+---'"11134..._-BLI DRIVER 36VLR PASS. 36VLR PASS. SOURCE SENSE
REDUNDAT INDICATOR GROUND
PASS SIDE HIGH
PASS SIDE LOW
SERIAL DATA
DRIVER SIDE HIGH DRIVER SlOE LOW REDUNDANT INDICATOR IGNITION 1
SRS INDICATOR
Ill

Page 1695 of 1928

ISUZU TROOPER 1995 Workshop Manual STEP
1
2
3
4
5
Supplemetl Restraint System 9J-71
DTC 26 l
I
DRIVER INITIATOR CIRCUIT OPEN
ACTION
YES
WAS THE "SRS DIAGNOSTIC SYSTEM CHECK" GO TO STEP2.
PERFORMED?
WHEN MEASUREMENTS

Page 1696 of 1928

ISUZU TROOPER 1995 Workshop Manual 9J-72 Supplemental Restraint System
DTC28
CURRENT SINK OR SOURCE FAILURE
CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the
DERM grounds the "Passenger Side Low" term

9J-72 Supplemental Restraint System
DTC28
CURRENT SINK OR SOURCE FAILURE
CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the
DERM grounds the "Passenger Side Low" terminal
"87"
and turns "ON" the driver current source at

the "Driver
Side High"terminal "89". The DERM then grounds the
"Driver Side Low" terminal
"88" and turns "ON" the
passenger current source at the "Passenger Side High"
terminal "A7". During each of these tests the DERM
monitors voltage at "Driver Side Low," "Passenger Side
Low," the difference between "Driver Side High" and
"Driver Side Low" and the difference between
"Passenger Side High" and "Passenger Side Low."
When the measured values are outside the expected
range DTC 28 is set.
DTC WILL SET WHEN
The voltage measured at "Driver Side Low" or
"Passenger Side Low'' is below a specified value while its
respective initiator resistance is
in range or when the
voltage measured at "Driver Side
Low" or "Passenger
Side Low" is above a specified value. This test is
run once
each
ignition cycle during the "Initiator Assembly
Resistance Tesf' when: 1) No "higher priority faults" are
detected during
"Turn-oN," 2) No "higher priority faults"
are detected during "Continuous Monitoring" for one
second, 3) No
"Crank" signal present, 4) "Ignition 1"
voltage is above a specified value.
, ...
ACTION TAKEN
DERM turns "ON the "AIR BAG" warning lamp and sets
a diagnostic trouble code.
DTC WILL CLEAR WHEN
The ignition switch is turned "OFF."
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test checks whether malfunction is in the wiring
harness. The wiring harness malfunction would be a
high resistance rather than an open. An open would
set a different diagnostic trouble code.
3. This test determines whether the malfunction is in
the wiring harness. The wiring harness malfunction
would be a high resistance rather than an open.
An
open would set a different diagnostic trouble code
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor
wire to terminal connection
in CKT 1 B18C or CKT 1836.
When a scan tool
"Clear Codes" command is issued and
the malfunction is still present, the DTC will not reappear
for ten minutes or until the next ignition cycle.
SRS-1 JOINT CONNECTION 10 11508
IGJ~oN-_;F,:::U:;SE~--t\:__-!!£'"'L-SWITCH SRS C-22 10A 11511 1812 181l
Bl RED
IIIII

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