Short To Voltage - Isuzu 2000 Trooper Workshop Manual

DTC 19 Passenger Deployment Loop Short To Voltage
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", and
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 B+ in the air bag assembly circuits.
DTC Will Set When:
"Ignition 1" is within the normal operating voltage range.
Once these conditions are met and the voltage at
"Passenger Bag Low" is above a specified value, DTC 19
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
DTC 19 and also DTC 71.
DTC Will Clear When:
The SDM is replaced.
RESTRAINT CONTROL SYSTEM
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 SDM.
3. This test isolates the malfunction to one side of the
passenger air bag assembly yellow 2–pin connector
behind glove box assembly.
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 B+ 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. A careful inspection of CKT IB07–YEL/GRN
and IB08–YEL/RED, including the passenger air bag
assembly pigtail is essential to ensure that the
replacement SDM will not be damaged.
9J1–21
D09RW001