DTC 22

CIRCUIT DESCRIPTION
The DERM injects a current through the steering column from the "Force High" output, terminal "A4," to the "Force Low" output, terminal "A10." By monitoring the difference between the voltage at the "Sense High" input, terminal "A7," and the "Sense Low" input, terminal "A6," the DERM calculates the combined resistance of the inflator module, SIR coil assembly, deployment loop and connector terminal contact in the steering column.

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

FAILURE CONDITIONS
DTC 22 will set if the combined resistance of the inflator module, SIR coil assembly, harness wiring and connector terminal contact in the steering column is less than a specified value.

ACTION TAKEN
The DERM illuminates the "INFL REST" indicator.

CONDITIONS TO CLEAR
Current DTC 22 will be cleared each time the ignition switch is turned to "OFF."

TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test determines whether the fault is in the steering column circuitry or diagnostic circuitry.
2. This test checks for a faulty resistor module.
3. This test determines whether the steering column fault is due to the SIR coil assembly or the inflator module.
4. This test checks for an open in the "Sense High" CKT 753.
5. This test determines whether the fault is due to a short from the "Sense High" CKT 753 to the "Force Low" CKT 688 or a faulty DERM.