charging ISUZU TROOPER 1995 Repair Manual

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
•

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
•

'
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
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1101
Al?,L 1127 CONNECTOR
1811
1120
SRS INDICATOR
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