Isuzu 2000 Trooper Workshop Manual page 2120

DTC 18 Passenger Deployment Loop Short To Ground
Circuit Description:
When the ignition switch is turned "ON", the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests, "Ignition 1",
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges.
The SDM monitors the voltages at "Driver Bag Low"
terminal "4" and "Passenger Bag Low" terminal "16" to
detect short to ground in the air bag assembly circuits.
DTC Will Set When:
Neither of the two air bag assemblies is open.
"Ignition 1" is within the normal operating voltage range.
Once these conditions are met and the voltage at
"Passenger Bag Low" is below a specified value, DTC 18
will set. This test is run once each ignition cycle and
"Continuous Monitoring".
Action Taken:
SDM turns "ON" the "AIR BAG" warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
This malfunction is no longer occurring and the ignition
switch is turned "OFF".
RESTRAINT CONTROL SYSTEM
DTC Chart Test Description:
Number(s) below refer to circled number(s) on the
diagnostic chart.
and
2. This test determines whether the SDM is
malfunctioning.
3. This test isolates the malfunction to one side of the
passenger air bag assembly yellow 2–pin connector
behind glove box compartment.
4. This test determines whether the malfunction is in
CKT IB07–YEL/GRN.
5. This test determines whether the malfunction is in
CKT IB08–YEL/RED.
Diagnostic Aids:
An intermittent condition is likely to be caused by a short
to ground in the passenger air bag assembly circuit.
Inspect CKTs IB07–YEL/GRN and IB08–YEL/RED
carefully for cutting or chafing. If the wiring pigtail of the
passenger air bag assembly is damaged, the component
must be replaced.
9J1–19
D09RW001