Workshop Manual

RESTRAINT CONTROL SYSTEM
9J1–28
DTC 22 Driver Deployment Loop Resistance Low
D09R200001
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 then proceeds with the “Resistance Measurement
Test” “Driver Bag Low” terminal “4” is grounded through a
current sink and the driver current source connected to
“Driver Bag High” terminal “3” allows a known amount of
current to flow. By monitoring the voltage difference
between “Driver Bag High” and “Driver Bag Low” the SDM
calculates the combined resistance of the driver air bag
assembly, SRS coil assembly, harness wiring CKTs
IB05–YEL and IB06–YEL/BLK and connector terminal
contact.
DTC Will Set When:
The combined resistance of the driver air bag assembly,
SRS coil assembly, harness wiring CKTs IB05–YEL and
IB06–YEL/BLK and connector terminal contact is above a
specified value. This test is run once each ignition cycle
during the “Resistance Measurement Test” when:
1.No “higher priority faults” are detected during
“Turn–ON”
2.“Ignition 1” voltage is in the specified value.
Action Taken:
SDM turns “ON” the “AIR BAG” warning lamp and sets
DTC 22.
DTC Will Clear When:
The ignition switch is turned “OFF.”