Chart 1

Diagnosis Chart:

Electrical Chart:

TEST CONDITIONS
Tested once each ignition cycle during the "Steering Column Resistance Test" if: 1) No faults are detected during "Turn-on"; 2) No faults are detected during "Continuous Monitoring" for 1 second; 3) No Crank signal present; 4) "IGNITION 1" voltage is present.

FAILURE CONDITIONS
DTC 22 sets when the combined resistance of the Inflator Module, SIR Coil, Resistor Module, harness wiring and connector terminal contact in the steering column is less than a specified value.

CONDITIONS TO CLEAR
Current DTC 22 clears each time Ignition Switch is turned "OFF."

ACTION TAKEN
DERM turns on "INFLATABLE RESTRAINT" warning lamp.

DESCRIPTION
The DERM injects 75 milliampere current through the steering column from the Force Hi output (terminal A4) to the Force Low input (terminal A10). The DERM monitors the voltage at the Sense Hi input (terminal A7) and the Sense Low input (terminal A6) and calculates the combined resistance of the Inflator Module, SIR Coil, Resistor Module, harness wiring and connector terminal contact in the steering column. DTC 22 sets when:
- The steering column resistance is less than a specified value.
- The Resistor Module's 430 ohm resistor is shorted.
- The Resistor Module's 100 ohm resistor value is too high.
- The deployment loop's high side is shorted to its low side.

NOTES ON FAULT TREE
1. Checks if fault is in steering column. SIR Load Tool J 37808 simulates the resistance of good steering column wiring and components.
2. Checks if fault is in Inflator Module or SIR Coil. SIR Load Tool J 37808 simulates resistance of a good Inflator Module.
3. Determines if fault is on deployment loop side or DERM side of Resistor Module.
4. Checks if circuit 347 and 349 are shorted together.
5. Checks if fault is in Dual Sensor or in wiring harness.