ISUZU TROOPER 1995 Workshop Manual

Supplemental Restraint System 9J-1 07
DTC81
DRIVER IGNITION DIODE OPEN
STEP
ACTION
YES NO
1 WAS THE "SRS
DIAGNOSTIC
SYSTEM CHECK" GOTOSTEP2. GO TO THE "SRS
PERFORMED? DIAGNOSTIC
SYSTEM CHECK."
2
WHEN MEASUREMENTS ARE REQUESTED IN THIS CHART GOTOSTEP3. GO TO STEPS.
USE
J-39200 DVM WITH CORRECT TERMINAL ADAPTER
FROM J-35616-A. IGNITION SWITCH "OFF."
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 COMPARTMENT DOOR ASSEMBLY.
DISCONNECT DUAL POLE ARMING SENSOR.
MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR
HARNESS CONNECTOR FROM TERMINAL "5" TO TERMINAL
"6".
DOES J-39200 DISPLAY "OL"(INFINITE)?
3 MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR GOTOSTEP4. GO TO STEPS.
HARNESS CONNECTOR FROM TERMINAL "4" TO TERMINAL
"6".
DOES J-39200 DISPLAY "OL"(INFINITE}?
4 RECONNECT DUAL POLE ARMING SENSOR. GOTOSTEP6. IGNITION SWITCH
DISCONNECT
DERM. "OFF."
IGNITION SWITCH "ON." GO
TO CHART A.
MEASURE VOLTAGE FROM DERM HARNESS CONNECTOR
TERMINAL "AS" TO TERMINAL "A1"(GROUND).
IS VOLTAGE 1 VOLT OR LESS?
5 REPLACE SRS HARNESS. GOTOSTEP7.
6 IGNITION SWITCH "OFF." GOTOSTEP7.
REPLACE DUAL POLE ARMING SENSOR.
7 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."

9J-1 08 Supplemental Restraint System
DTC82
PASSENGER IGNITION DIODE OP N
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 36 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, the voltage measured at "Driver
Source Sense" is
within a specified range of
"Ignition 1" voltage measured
at "Passenger
Source Sense" is a specified amount
below "Ignition 1" voltage DTC 82 is set.
DTC WILL SET WHEN
With both "36 VLR" power supplies in a discharged state,
the DERM detects
"Ignition 1" voltage at "Driver Source
Sense" terminal
"AS" while simultaneously the DERM
does not detect
"Ignition 1" voltage at "Passenger Source
Sense"
terminal "A6". This 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 voltages measured at "Driver
Source Sense"
'"'
terminal "AS" and "Passenger Source Sense" terminal
"A6" are simultaneously within a specified range of
"Ignition 1" voltage. When neither the failure nor clear
conditions are met, the state of the DTC 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 a short from the "Passenger
Source Sense" circuit to the "Passenger 36 VLR"
circuit.
3. This test check for a short from the "Passenger
Source Sense" circuit to the "Driver 36 VLR" circuit.
4. This test determines whether the malfunction is due
to an open within the
dual pole arming sensor.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a short
between
CKT IB12 and CKT IB14, a short between CKT
IB13
and CKT IB14, or an open inside the dual pole
arming sensor. 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
Codes"
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."
SRS-1 JOINT CONNEcnoN . lG,J;~ON _ _.::FU::OS£'---.-r:--m_-SWITCH SRS C..z2 10A
•

Supplemental Restraint System 9J-1 09
DTC82
PASSENGER IGNITION DIODE OPEN
STEP
ACTION YES NO
1 WAS THE "SRS
DIAGNOSTIC
SYSTEM
CHECK" GOTOSTEP2. GO TO THE "SRS PERFORMED? DIAGNOSTIC
SYSTEM CHECK."
2
WHEN MEASUREMENTS ARE REQUESTED IN THIS CHART GOTOSTEP3. GOTOSTEP5 USE J-39200 DVM WITH CORRECT TERMINAL ADAPTER
FROM J-35616-A. IGNITION SWITCH "OFF."
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 COMPARTMENT DOOR ASSEMBLY.
DISCONNECT DUAL POLE ARMING SENSOR.
MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR
HARNESS CONNECTOR FROM TERMINAL "1" TO TERMINAL
"5". DOES J-39200 DISPLAY "OL"(INFINITE}?
3 MEASURE RESISTANCE ON DUAL POLE ARMING SENSOR GOTOSTEP4. GOTOSTEP5.
HARNESS CONNECTOR FROM TERMINAL "1" TO TERMINAL "4".
DOES J-39200 DISPLAY "OL"(INFINITE}?
4 RECONNECT DUAL POLE ARMING SENSOR. GOTOSTEP6. IGNITION SWITCH
DISCONNECT DERM. "OFF."
IGNITION SWITCH "ON." GO TO CHART A.
MEASURE VOLTAGE FROM DERM HARNESS CONNECTOR
TERMINAL "A6" TO TERMINAL "A1"(GROUND}.
IS VOLTAGE
1 VOLT OR LESS?
5 REPLACE SRS HARNESS. GOTOSTEP7.
6 IGNITION SWITCH "OFF." GOTOSTEP7. REPLACE DUAL POLE ARMING SENSOR.
7 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."

9J-110 Supplemental Restraint Syst~m
HISTORY DTC 83
DRIVER RESERVE DIODE SHORT D
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" power supplies. While the delay is
active the DERM measures the voltage at the "Driver 36
VLR" terminal "A4", "Passenger 36 VLR" terminal "A3",
"Driver Source Sense" terminal "AS", and "Passenger
Source Sense" terminal "A6". When the driver reserve
diode is shorted
"Ignition 1" voltage is measured at
"Driver 36
VLR" from the forward biases driver ignition
diode. When the voltage measured at "driver 36
VLR" is
within a specified range of
"Ignition 1" voltage for eight
consecutive
"Turn-ON" tests history DTC 83 is set.
DTC WILL SET WHEN
The voltage measured at "Driver 36 VLR" terminal "A4"
is within a specified range of "Ignition 1"voltage for eight
consecutive
"Turn-ON" tests and no "higher priority
faults" are detected. This test is run once each ignition
during the
"Turn-ON" test while the "36 VLR delay" is
active.
a SRS·Z
ACTION TAKEN
DERM sets a history diagnostic trouble code.
DTC WILL CLEAR WHEN
The voltage measured at "Driver 36 VLR" terminal "A4"
indicated that the power supply is in a discharged state
during
"Turn-ON" tests.
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart;
2. This test determines whether the malfunction is due
to a shorted driver reserve diode within the dual pole
arming sensor.
DIAGNOSTIC AIDS
This diagnostic trouble code will not set as a current
DTC. Therefore
follow the DTC chart to diagnose a
history
DTC 83.
SRS-1 JOINT CONNECTION
IGNITION 1
IGNITION 1 DRIVER
SOURCE SENSE
DRIVER
36VLR PASS. 36VlR PASS. SOURCE
SENSE
JOINT CONNECTION
REDUNDAT INDICATOR GROUND IY05 BlKJRE
4soDv PASS SIDE HIGH
PASS SIDE LOW
SERIAL
DATA
DRIVER SIDE
HIGH
DRIVER SIDE
LOW REDUNDANT INDICATOR
IGNITION 1
SRS INDICA TOR
•

Supplemental Restraint System 9J-111
HISTORY DTC 83
DRIVER RESERVE DIODE SHORTED
STEP
ACTION YES NO
1 WAS THE "SRS
DIAGNOSTIC SYSTEM CHECK" GOTOSTEP2. GO TO THE "SRS
PERFORMED? DIAGNOSTIC
SYSTEM CHECK."
2 WHEN
MEASUREMENTS ARE REQUESTED IN THIS CHART IGNITION SWITCH IGNITION
SWITCH
USE J-39200 DVM WITH CORRECT TERMINAL ADAPTER "OFF." "OFF."
FROM J-35616-A. GO TO CHART A. REPLACE DUAL
IGNITION
SWITCH "OFF." POLE
ARMING
DISCONNECT DRIVER
AND PASSENGER INFLATOR SENSOR.
MODULES, YELLOW 2-WAY OR 4-WAY CONNECTORS GOTOSTEP3.
LOCATED AT THE TOP OF THE STEERING COLUMN AND BEHIND THE liP COMPARTMENT DOOR ASSEMBLY.
DISCONNECT DERM. IGNITION SWITCH "ON."
MEASURE
VOLTAGE ON DERM HARNESS CONNECTOR
TERMINAL "A4" TO TERMINAL "A1"(GROUND). IS VOLTAGE 1 VOLT OR LESS?
3 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."

'
9J-112 Supplemental Restraint System
HISTORY DTC 84
PASSENGER RESERVE DIODE SHOR D
CIRCUIT DESCRIPTION
During the "Turn-ON" tests, preformed at the beginning
of each ignition cycle, the DERM delays 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 36 VLR" terminal "A4",
"Passenger 36 VLR" terminal "A3", "Driver Source
Sense"
terminal "AS" and "Passenger Source Sense"
terminal "A6". When the passenger reserve diode is
shorted
"Ignition 1" voltage measured at "Passenger 36
VLR" is within a specified range of "Ignition 1" voltage for
eight consecutive
"Turn-ON" tests history DTC84 is set.
DTC WILL SET WHEN
The voltage measured at "Passenger 36 VLR" terminal
"A3" is within a specified range of "Ignition 1" voltage for
eight consecutive
"Turn-ON" tests and no higher priority
faults are detected. This test
is run once each ignition
cycle during the
"Turn-ON" test while the "36 VLR Delay"
is active.
ACTION TAKEN
DERM sets a history diagnostic trouble code.
DTC WILL CLEAR WHEN
The voltage measured at "Passenger 36 VLR" terminal
"A3" indicates that the power supply is in a discharged
state during
"Turn-ON" tests.
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test determines whether the malfunction is due
to a shorted passenger reserve diode within the dual
pole arming sensor.
DIAGNOSTIC AIDS
This diagnostic trouble code will not set as a current
DTC. Therefore follow the DTC chart to diagnose a
history
DTC 84.
SRS-1 JOINT CONNECTION
IGNITION 1
IGNITION 1 DRIVER SOURCE SENSE DRIVER 36VLR
PASS. 35VLR
PASS. SOURCE
SENSE
PASS SIDE HIGH
PASS
SIDE LOW
f--'""'-----7---3-7-7-~--1!!!i!03!..4 --BLKIBLU SPARE/I.PS
1---""''----4------4-4-4--_JTO ~~:::~ELT 1133 BLU
1101
Al?,L 1127 CONNECTOR
1811
1120
SRS INDICATOR
..

STEP
1
2
3
Supplemental Restraint System 9J-113
HI TORY DTC 84
PASSENGER RESERVE DIODE SHORTED
ACTION
YES NO
WAS
THE "SRS DIAGNOSTIC SYSTEM CHECK'' GOTOSTEP2. GO TO THE "SRS PERFORMED? DIAGNOSTIC
SYSTEM CHECK."
WHEN MEASUREMENTS ARE REQUESTED IN THIS CHART IGNITION SWITCH IGNITION
SWITCH
USE J-39200 DVM WITH CORRECT TERMINAL ADAPTER "OFF." "OFF."
FROM J-35616-A. GO TO CHART A. REPLACE DUAL IGNITION
SWITCH "OFF."
POLE ARMING
DISCONNECT DRIVER
AND PASSENGER INFLATOR SENSOR.
MODULES, YELLOW 2-WAY OR 4-WAY CONNECTORS GOTOSTEP3. LOCATED AT THE TOP OF THE STEERING COLUMN AND BEHIND THE 1/P COMPARTMENT DOOR ASSEMBLY.
DISCONNECT DERM.
IGNITION SWITCH "ON."
MEASURE VOLTAGE FROM DERM HARNESS CONNECTOR
TERMINAL "A3" TO TERMINAL "A1"(GROUND).
IS
VOLTAGE 1 VOLT OR LESS?
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."

9J-114 Supplemental Restraint System

BRANK PAGE
•

Supplemental iraint System
TABLE OF CONTENTS
SUPPLEMENTAL RESTRAINT SYSTEM
{SRS)
SECTION 3 -SERVICE
9J-115
CAUTION: WHEN FASTENERS ARE REMOVED, ALWAYS REINSTALL THEM AT THE SAME LOCATION
FROM WHICH
THEY WERE REMOVED. IF A FASTENER NEEDS TO BE REPLACED, USE THE CORRECT PART
NUMBER FASTENER
FOR THAT APPLICATION. IF THE CORRECT PART NUMBER FASTENER IS NOT
AVAILABLE,
A FASTENER OF EQUAL SIZE AND STRENGTH (OR STRONGER) MAY BE USED. FASTENERS
THAT ARE NOT REUSED, AND THOSE REQUIRING THREAD LOCKING COMPOUND WILL BE CALLED OUT.
THE CORRECT TORQUE VALUE MUST BE USED WHEN INSTALLING FASTENERS THAT REQUIRE IT. IF THE
ABOVE CONDITIONS ARE NOT FOLLOWED, PARTS OR SYSTEM DAMAGE COULD RESULT.
SERVICE PRECAUTIONS . . . . . . . . . • . . . . . • • . . . . . . . . • . • • . . . . . . . . . . . • . . • • . . . . . . . 117
Disabling the SRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Enabling the SRS • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 117
Handling/Installation/Diagnosis • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 117
Inspections Required After Accident • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 117
DIAGNOSTIC ENERGY RESERVE MODULE (DERM) • • . • • . • • • • . . • . . . • • . . . . • . . . • 119
DISCRIMINATING SENSOR-FORWARD SENSOR LH . • . . • • . • . . • . . • . • . . . • • . . • • . 120
DISCRIMINATING SENSOR
-FORWARD SENSOR RH • . • . . . • • • . • . . . . • • . • . . . . . • • 121
DUAL POLE ARMING SENSOR . . . . . . . . . . • . . . . . • . . . . . . . . . . . . • • . . . . . . . . • . . . . . . . 122
DRIVER INFLATOR MODULE ............•..•........•....•....•....•.........
STEERING WHEEL •........•........•.•......••........•..••..•\
•....•....•..
SRS COIL ASSEMBLY ....•......•.•......•.............•••..•....•\
.....•..••
124
125
127
STEERING COLUMN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
PASSENGER INFLATOR MODULE . . . • . . . . . • . • • . . . . . . . . • . . . • • . . • • . . • • . . . . • • . . • 132
SPECIFICATION . .

. . . . . . . . . . . . . .
• . .
. . . . . .
• . .
. . . .
• • • • • • . . • • . • • • . .

.
• . .
. .
• • . .

.
• • 133

9J-116 Supplemental Restraint System
BLANK PAGE
Ill