1995 ISUZU TROOPER Workshop Manual

Supplemental Restraint System 9J-41
TABLED
"AIR BAG" WARNING LAMP DOES NOT COME "ON"
STEADY DURING
CRANK
STEP
ACTION YES NO
1
WHEN MEASUREMENTS ARE REQUESTED IN THIS CHART IGNITION SWITCH GOTO STEP2.
USE
J-39200 DVM WITH CORRECT TERMINAL ADAPTER "OFF."
FROM J-35616-A. CHECK FOR
INSTALL C-1 FUSE.
PROPER
DISCONNECT DRIVER
AND PASSENGER INFLATOR CONNECTION AT
MODULES, YELLOW 2-WAY OR 4-WAY CONNECTORS DERM HARNESS
LOCATED NEAR THE BASE OF THE STEERING COLUMN CONNECTOR AND BEHIND THE liP COMPARTMENT DOOR ASSEMBLY. TERMINAL "B10".
DISCONNECT DERM. IF OK, THEN GO TO MEASURE VOLTAGE ON DERM HARNESS CONNECTOR CHARTA. FROM TERMINAL "B1 0" TO TERMINAL "A 1"(GROUND) WHILE
STARTING ENGINE.
IS VOLTAGE
GREATER THAN 7.25 VOLTS?
2 IGNITION SWITCH "OFF." GOTOSTEP5. GOTOSTEP3.
REMOVE G-1 FUSE.
MEASURE RESISTANCE FROM
EACH TERMINAL OF THE G-1 FUSE FUSE HOLDER TO DERM HARNESS CONNECTOR
TERMINAL "B10".
IS EITHER
MEASUREMENT 5.00 OR LESS?
3 DISCONNECT BODY HARNESS CONNECTOR. GOTOSTEP4. GOTOSTEP6.
CHECK FOR PROPER CONNECTION AT BODY HARNESS
CONNECTOR TERMINAL "4".
IF OK,
THEN MEASURE
RESISTANCE FROM EACH TERMINAL OF THE C-1 FUSE FUSE HOLDER TO BODY
HARNESS CONNECTOR TERMINAL "4"
IS EITHER
MEASUREMENT 5.00 OR LESS?
4 MEASURE
RESISTANCE FROM BODY HARNESS GOTOSTEP7. REPLACE SRS
CONNECTOR TERMINAL
"4" TO DERM HARNESS HARNESS
CONNECTOR TERMINAL "B10". GOTOSTEP7.
IS EITHER MEASUREMENT 5.00 OR LESS?
5 REPAIR OPEN IN POWER FEED TO C-1 FUSE, REFER TO GO
TO STEP?.
SECTION 8. INSTALL G-1 FUSE.
6 REPLACE BODY HARNESS. GOTOSTEP7.
7 RECONNECT ALL SRS COMPONENTS, ENSURE ALL GO TO THE "SRS DIAGNOSTIC SYSTEM
COMPONENTS
ARE PROPERLY MOUNTED. CHECK" REPEAT THE "SRS DIAGNOSTIC SYSTEM CHECK."

9J-42 Supplemental Restraint System
DTC 14
DUAL
POLE ARMING SENSOR DISCONNECTED
CIRCUIT DESCRIPTION
The DERM monitors the voltage at the "Driver Source
Sense" terminal
"AS", the "Passenger Source Sense"
terminal "AS",
the "Driver Side High" terminal "B9", the
"Passenger
Side High" terminal "A7'', the "Driver Side
Low" terminal
"88" and the "Passenger Side Low"
terminal "87" during the "Continuous Monitoring" tests.
When
all voltages are simultaneously below a specified
value for 500 milliseconds DTC 14 sets.DTC will set
when: The voltages at terminals "A5","A6","B9",
"A7","B8" and "B7'' of the DERM harness connector are
simultaneously below a specified value for 500
milliseconds.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
diagnostic
trouble code.
DTC WILL CLEAR WHEN
The voltage at terminal "A5","A6","B9","A7","B8" and
"87'' of the DERM harness connector is above specified
value for 500 milliseconds.
~~ 10A 1101 RD
DTC CHART TEST DESCRIPTION
Number(s) below refer to step number(s) on the
diagnostic chart.
2. This test checks for a situation which prevents a
proper connection of the
dual pole arming sensor to
the wiring harness.
DIAGNOSTIC AIDS
It is highly unlikely that an intermittent condition has set
this diagnostic
trouble code as this would require a poor
connection at
terminal"1", "2" and "3" or at terminal "4"
, "5" ,
"6" and "7" of Dual Pole Arming Sensor Connector.
IGNmDNt
PASS.38VLR PASS. SOURCE SENSE
PASS SIDE HIGH
PASS SIDE LOW
SERIAL DATA
SRS INDICATOR
Ill

Supplemental Restraint System 9J-43
DTC 14
DUAL POLE
ARMING SENSOR DISCONNECTED
STEP ACTION YES NO
1 WAS THE "SRS
DIAGNOSTIC SYSTEM CHECK" GOTOSTEP2. GO TO THE "SRS PERFORMED? DIAGNOSTIC
SYSTEM CHECK"
2 IGNITION SWITCH "OFF." IGNITION SWITCH IGNITION
SWITCH
DISCONNECT DRIVER AND PASSENGER INFLATOR "OFF." "OFF."
MODULES, YELLOW 2-WAY OR 4-WAY CONNECTORS GO TO CHART A. GOTO STEP3.
LOCATED AT THE TOP OF THE STEERING COLUMN AND BEHIND THE 1/P COMPARTMENT DOOR ASSEMBLY.
DISCONNECT DUAL POLE ARMING SENSOR HARNESS CONNECTOR FROM DUAL POLE ARMING SENSOR AND RECONNECT.
IGNITION SWITCH "ON."
IS DTC
14 CURRENT?
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-44 Supplemental Restraint System
DTC 15
PASSENGER INITIATOR CIRCUIT RESISTANCE HIGH
CIRCUIT DESCRIPTION
During the "Initiator Assembly Resistance Test" the
DERM grounds the
"Driver Side Low" terminal "BB" and
turns "ON" the passenger current source at the
"Passenger Side High" terminal "A7". This causes a
known amount of current to
flow through the passenger
initiator circuit. By monitoring the difference between the
voltage at the "Passenger Side High" terminal "A7" and
the "Passenger
Side Low" terminal "B7" the DERM
calculates the combined resistance of the passenger
inflator module, harness wiring CKTs IB21, IB22 and
IB24 and connector terminal contact.
DTC WILL SET WHEN
The combined resistance of the passenger inflator
module,
harness wiring CKT's IB21, IB22, and IB24 and
connector
terminal contact 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 determines whether the malfunction is in
the passenger inflator module circuitry or in the
DERM wiring harness circuitry.
3. This test determines whether the malfunction is an
open in CKT's IB"21, IB22, IB24.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor
connection to the passenger
inflator module terminal "2"
or terminal "3" or a poor connection to the DERM at
terminal "A7''. 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 next ignition cycle.
DRIVER 36VLR PASS. 36VLR PASS. SOURCE SENSE
REDUNDAT INDICATOR GROUND
PASS SIDE HIGH
PASS SIDE LOW
SERIAL DATA
SRS INDICATOR
Ill

~ Supplemental Restraint System 9J-45
DTC 15
'-"' PASSENGER INITIATOR CIRCUIT RESISTANCE HIGH
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. GOTO 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. CONNECT J-41433 SRS DRIVER/PASSENGER LOAD TOOL
TO STEERING COLUMN HARNESS CONNECTOR AND
PASSENGER INFLATOR MODULE HARNESS CONNECTOR.
IGNITION SWITCH "ON."
IS
DTC 15 CURRENT?
3
IGNITION SWITCH "OFF."
GO TO CHART A. GOTOSTEP4.
DISCONNECT SRS DRIVER/PASSENGER LOAD TOOL.
DISCONNECT DERM.
CHECK FOR PROPER CONNECTION
TO DERM AT TERMINAL "A7'.
IF OK
THEN MEASURE RESISTANCE FROM DERM HARNESS
-CONNECTOR TERMINAL "A7" TO PASSENGER INFLATOR
MODULE
HARNESS CONNECTOR TERMINAL "2".
IS RESISTANCE 2.0n OR LESS?
4
REPLACE SRS HARNESS. GOTOSTEP6.
5 IGNITION SWITCH "OFF." GOTOSTEP6. REPLACE PASSENGER INFLATOR MODULE.
6 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."