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? DIAGNOSTIC
SYSTEM CHECK."
2 WHEN MEASUREMENTS ARE REQUESTED IN THIS CHART GOTOSTEP3. GOTO STEP4.
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.
CHECK FOR PROPER CONNECTION TO
DUAL POLE
ARMING SENSOR AT TERMINALS "3".
IF OK THEN DISCONNECT DERM.
MEASURE RESISTANCE FROM DERM HARNESS
CONNECTOR TERMINAL "A9" TO DUAL POLE ARMING
SENSOR HARNESS CONNECTOR TERMINAL "3". IS RESISTANCE 5.00 OR LESS?
3 RECONNECT DUAL POLE ARMING SENSOR. GO TO STEPS. IGNITION
SWITCH
IGNITION SWITCH "ON." "OFF."
MEASURE VOLTAGE ON DERM HARNESS
CONNECTOR GO
TO CHART A.
FROM TERMINAL "AS" TO TERMINAL "A 1 "(GROUND).
IS VOLTAGE 1 VOLT OR LESS?
4 CHECK C-24 FUSE. GOTO STEP6. GOTOSTEP7.
IS IT OPEN?
5 IGNITION SWITCH "OFF." GOTOSTEP8.
REPLACE DUAL POLE ARMING SENSOR.
6 REPLACE C-24 FUSE.(10A) GOTOSTEP7. GOTO STEPS.
MEASURE RESISTANCE FROM DERM HARNESS
CONNECTOR TERMINAL "A1" TO DUAL POLE ARMING
SENSOR HARNESS CONNECTOR TERMINAL "3".
IS RESISTANCE
5.00 OR LESS?
7 REPLACE SRS HARNESS GOTOSTEP8.
8 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-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
..

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."

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
..

Supplemental Restraint System 9J-81
DTC36
'-" PASSENGER LOOP ENERGY RESERVE FEED 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. GOTOSTEP6.
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 COMPONENT DOOR ASSEMBLY.
DISCONNECT DUAL POLE ARMING SENSOR.
CHECK FOR PROPER CONNECTION TO DUAL POLE
ARMING SENSOR AT TERMINALS "1" AND "5".
IF OK THEN DISCONNECTION DERM.
CHECK FOR PROPER CONNECTION TO DERM AT TERMINALS "A3" AND "A6".
IF OK THEN MEASURE RESISTANCE FROM DERM HARNESS
CONNECTOR TERMINAL "A3" TO DUAL POLE ARMING
SENSOR HARNESS CONNECTOR TERMINAL "5".
IS RESISTANCE 5.00. OR LESS?
3 MEASURE
RESISTANCE
FROM DERM HARNESS GOTOSTEP4. GOTO STEP6.
CONNECTOR TERMINAL "A6" TO
DUAL POLE ARMING
SENSOR HARNESS CONNECTOR TERMINAL"1".
IS RESISTANCE 5.00. OR LESS?
4 IGNITION SWITCH "ON." GOTOSTEP5. IGNITION
SWITCH
MEASURE VOLTAGE ON
DERM HARNESS CONNECTOR "OFF."
FROM TERMINAL "A6" TO TERMINAL "A1"{GROUND). GOTOSTEP6.
IS VOLTAGE 1 VOLT OR LESS?
5 IGNITION SWITCH "OFF." IGNITION SWITCH GOTOSTEP7.
RECONNECT DERM AND DUAL POLE ARMING SENSOR.
"OFF."
IGNITION SWITCH "ON." GO TO CHART A. USING TECH 1 DATA LIST FUNCTION, SELECT
"PASS.SOURCE."
IS
VOLTAGE GREATER THAN 31 VOLTS?
6
REPLACE SRS HARNESS. GOTOSTEP8.
7 IGNITION SWITCH "OFF." GOTOSTEP8. REPLACE DUAL POLE ARMING SENSOR.
8
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·82 Supplemental Restraint System
DTC37
HYBRID INFLATOR LOW PRESSURE
CIRCUIT DESCRIPTION
During normal "Ignition 1" voltage is applied from the
"C-23" fuse trough passenger low peraaaure warning
sensor to DERM st
"LPS" terminal "83". When the
pressure in the gas cylinder within the passenger inflator
module is operating normally the measured voltage will
be the same voltage as "Ignition 1" voltage. If the
passenger
low pressure warning sensor circuit opens or
short to ground the voltage measured st
"LPS" will
decrease to near ground voltage. When the voltage
measured
at"LPS" is outside the specified renge DTC 37
is set.
DTC WILL SET WHEN
The voltage measured at "LPS" terminal "83" is outside
the specified renge. This test is run every 100
milliseconds during "Continuous Montoring" tests.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
diagnostic trouble code.
DTC WILL CLEAR WHEN
The voltage measured at "LPS" terminal "83" is within a
specified rande which doesn't the diagnostic trouble
code, svery
100 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 due
to high resistance
in the "Passenger Low Pressure
Warning
Sensor."
3. This test checks for an open onside the "LPS" circuit.
4. This test checks for a short from the "LPS" cirsuit to
ground.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor
connection Passenger
Inflator Module terminal "1" or "4"
poor connection at DERM terminal "83", an open in CKT
1834 or CKT 1834 or an open inside the Passenger
Inflator Module.
SRS-1 JOINT CONNECTION 10 , ... IGNITION!
IGNITION 1 ORIVER SOURCE SENSE DRIVER 38VLR PASS.3eVLR PASS. SOURCE SENSE
REDUNDAT INDICATOR GROUND
PASS SIDE HIGH
PASS SIDE LOW
SPARE/I.PS DRIVER SEAT BELT
SERIAL DATA
DRIVER SIDE HIGH DRIVER SIDE LOW REDUNDANT INDICATOR IGNITION!
SRS INDICATOR
..

Supplemental Restraint System 9J-83
DTC37
HYBRID INFLATOR LOW PRESSURE
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. GOTOSTEP6. 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
37 CURRENT?
3
IGNITION SWITCH "OFF." GOTOSTEP4. GOTO STEP4. DISCONNECT SRS DRIVER/PASSENGER LOAD TOOL.
DISCONNECT DERM. CHECK FOR PROPER CONNECTION
TO DERM AT TERMINAL "B3".
IF OK THEN MEASURE RESISTANCE FROM DERM HARNESS CONNECTOR TERMINAL "B3" TO PASSENGER INFLATOR MODULE HARNESS CONNECTOR TERMINAL "1".
IS RESISTANCE 2.0.n OR LESS?
4
MEASURE RESISTANCE ON DERM HARNESS CONNECTOR GOTO STEPS. GO TO CHART A. FROM TERMINAL "A1" TO TERMINAL "B3". IS RESISTANCE
5.0.n OR LESS?
5 REPLACE SRS HARNESS. GOTOSTEP7.
6 IGNITION SWITCH "OFF." GOTOSTEP7. REPLACE PASSENGER INFLATOR MODULE.
7
RECONNECT ALL SRS COMPONENTS, ENSURE ALL GO TO THE "SRS DIAGNOSTIC SYSTEM
COMPONENTS ARE PROPERLY MOUNTED. CHECK".
CLEAR SRS DIAGNOSTIC TROUBLE CODES. REPEAT "SRS DIAGNOSTIC SYSTEM CHECK."

9J-84 Supplemental Restraint System
DTC42
LOOP ENERGY RESERVE VOLTAGE LOW
CIRCUIT DESCRIPTION
During the "Turn-ON" tests, performed at the beginning
of each ignition
cycle, the DERM delays charging of the
"Driver "36
VLR" terminal "A4" and "Passenger 36 VLR"
terminal
"A3" power supplies. After delay has expired
both "36
VLR" power supplies are allowed to change.
The DERM monitors each
"36 VLR" power supply to
ensure each has changed to a
voltage above a specified
value within 1 0 seconds after "Ignition 1" voltage is first
applied to DERM. When either "36 VLR" power supply
does not reach the specified voltage within the allowed
time or, once reaching the voltage, falls it for 500
milliseconds, DTC 42 is set.
DTC WILL SET WHEN
The voltage at either "36 VLR" power supply does not
exceed a specified
value within 10 seconds after "Ignition
1" voltage is first applied to the DERM or once having
reached the specified
value, either "36 VLR" power
supply voltage falls below the specified value for 500
milliseconds.
This test is run each ignition cycle at
"Turn-ON" to detect a change time failure and, after
charging, tested every
100 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 36 VLR" terminal "A4"
and "Passenger 36
VLR" terminal "A3" are above 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 checks whether the DERM has set the
diagnostic
trouble code falsely.
3. This test checks whether a malfunctioning dual pole
arming sensor is preventing dual pole arming sensor
is preventing the "Driver 36
VLR" or "Passenger 36
VLR" from charging.
4. This test checks for a short from the "Driver 36 VLR"
or "Passenger 36 VLR" circuit to 8+.
5. This test checks for a short from the "Driver 36 VLR"
or "Passenger 36 VLR" circuit to ground.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a short
from "Driver 36
VLR" or "Passenger 36 VLR" to B+ or
ground, or a short inside the
dual pole arming sensor.
SRS~1 JOINT CONNECTION IBOii 12 1G IGNITION 1
DRIVER 36VLR PASS.31VLR PASS. SOURCE SENSE
REDUNDAT INDICATOR GROUND
PASS SIDE HIGH PASS SIDE LOW
SPAREilPS
SERIAL DATA
DRIVER SIDE HIGH DRIVER SIDE LOW REDUNDANT INDICATOR IGNmON 1
1111

Supplemental Restraint System
9J-85
DTC42
LOOP ENERGY RESERVE VOLTAGE LOW
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 GOTOSTEP3.
USE J-39200 DVM WITH CORRECT TERMINAL ADAPTER "OFF." FROM J-35616-A. GO TO CHART A. IGNITION SWITCH "ON."
USING
TECH-1 SRS DATA LIST FUNCTION SELECT"DRIVER 36 VLR" "PASS 36 VLR."
RECORD BOTH "DRIVER 36 VLR" AND "PASS 36 VLR"
VOLTAGES ON REPAIR ORDER.
ARE BOTH RECORDED VOLTAGES 32.5 VOLTS OR MORE?
3 IGNITION SWITCH "OFF." GOTOSTEP4. GOTOSTEP6. DISCONNECT
DRIVER AND PASSENGER INFLATOR
MODULES, YELLOW 2-WAY OR 4-WAY CONNECTORS
LOCATED AT THE TOP OF THE STEERING COLUMN AND BEHIND THE liP COMPONENT DOOR ASSEMBLY.
DISCONNECT DUAL POLE ARMING SENSOR.
IGNITION SWITCH "ON."
USING
TECH-1 SRS DATA LIST FUNCTION SELECT"DRIVER 36 VLR" "PASS 36 VLR." ARE THE DISPLAYED VOLTAGES ABOUT THE SAME AS THE
RECORDED VOLTAGES?
4 USING TECH-1 SRS DATA LIST FUNCTION SELECT GOTOSTEP7. GOTOSTEP5. "IGNITION."
IS THE DISPLAYED VOLTAGE ABOUT THE SAME AS THE
RECORDED "DRIVER 36 VLR" "PASS 36 VLR." VOLTAGE?
5 IGNITION SWITCH "OFF."
GO TO STEPS. GO TO CHART A. ARE EITHER OF THE RECORDED VOLTAGES 1 VOLT OR
LESS?
6 IGNITION SWITCH "OFF."
GO TO STEPS. REPLACE DUAL POLE ARMING SENSOR.
7
REPLACE SRS HARNESS.
GO TO STEPS.
8 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-86 Supplemental Restraint System
DTC43
DRIVER SOURCE FEED LOW
CIRCUIT DESCRIPTION
During normal, non-deployment operation of the SRS
the DERM monitors the voltage supplied through the
dual pole arming sensor to the high side of the driver
deployment loop at the "Driver Source Sense" terminal
"AS".
This measured voltage will have a value
approximately equal to "Driver 36 VLR." When the
voltage measured at "Driver Side Low" terminal "88" is
in its normal operating range, indicating driver
deployment loop integrity has been maintained, while
simultaneously
the voltage measured at "Driver Source
Sense"
is a specified amount below "Driver 36 VLR" for
SOO milliseconds DTC 43 is set.
DTC WILL SET WHEN
The voltage measured at "Driver Side Low" terminal "88"
is within a specified percentage of "Driver 36 VLR" while
simultaneously
the voltage measured at "Driver Source
Sense" terminal
during the "Continuous Monitoring"
tests.
ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets
a diagnostic
trouble code.
DTC WILL CLEAR WHE
The voltage measured at "Driver Side Low" terminal "88"
is within a specified percentage of "Driver 36 VLR" while
simultaneously
the voltage measured at "Driver Source
Sense" terminal "AS"
is within a specified amount of
"Driver 36 VLR" for SOO 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 "Driver Source
Sense"
circuit.
3. This test checks for a short from the "Driver Source
Sense"
circuit to ground.
4. This test determines whether the malfunction is due
to increased resistance across the "Driver
Source
Sense"
resistor in the dual pole arming sensor.
DIAGNOSTIC AIDS
An intermittent condition is likely to be caused by a poor
connection to the DERM at terminal "AS", a poor
connection to the dual pole arming sensor at terminal "6",
an open or short to ground in CKT 1811 or a partial open
inside the
dual pole arming sensor.
SRS-1 FUSE JOINT CONNECTION ___ sR~S~C-~23-10_A __ ~'NK----~·~·~~----------~~-Pw--~•·~~---TO IGNITION SWITCH
FUSE! SRS C-24 10A , ... REO
TO FUSE 1001 ~~~~g~ _S_R_.S C,.:;.:·2:i-2 -10A--~r'f"---....l!!!<'----• 1111
181Z 1113
1814
B RED
IGNITION 1 IGNITION 1
DRIVER 36VLR PASS.38VLR PASS. SOURCE SENSE
REDUNOAT INDICATOR GROUND
PASS SlOE HIGH
PASS SIDE LOW
SERIAL DATA
SRS INDICATOR
..