DTC 22

Circuit Description
When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform tests to diagnose critical malfunctions within itself. Upon passing these tests, Ignition 1 and deployment loop voltages are measured to ensure that they are within their respective normal voltage ranges. The SDM then proceeds with the resistance measurement test. Driver low terminal A3 is grounded through a current sink, and the driver current source is connected to the driver high terminal A6 to allow a known amount of current to flow. By monitoring the voltage difference between driver high and driver low, the SDM calculates the combined resistance of the driver inflator module, the clock spring, the harness wiring, and the connector terminal contacts.

DTC 22 Will Set When
The resistance of the driver deployment loop is out of a specified value. The test is run once each ignition cycle during the resistance measurement test when
- No higher priority faults are detected when the ignition is turned ON.
- Ignition 1 voltage is below a specified value.

Action Taken
The SDM will turn on the AIRBAG indicator and set a diagnostic trouble code (DTC) 22.

DTC 22 Will Clear When
The ignition switch is turned OFF or the scan tool CLEAR CODES command is received.

Diagnostic Aids
An intermittent condition is likely to be caused by a short between driver high and driver low or between driver high and passenger low. This condition could also be caused by a faulty clock spring or a faulty shorting bar in the clock spring steering column connector. The test for this DTC is run only while the AIRBAG indicator is performing the turn-on test. When a scan tool CLEAR CODES command is issued and the malfunction is still present, the DTC will not reappear until the next ignition cycle.

Test Description
The number(s) below refer to step(s) on the diagnostic table.

3. See the first caution below.
15. See the cautions below.

Steps 1 - 9:

Steps 10 - 15:

DTC 22 - Driver Deployment Loop Shorted

CAUTION: The SDM can maintain sufficient voltage to deploy the airbags for 10 minutes after the ignition is OFF and the fuse has been removed. If the airbags are not disconnected, service cannot begin until 10 minutes have passed after disconnecting power to the SDM.

CAUTION: During service procedures, be very careful when handling the SDM. Never strike or jar the SDM.

Never power up the SIR system when the SDM is not rigidly attached to the vehicle. All SDM mounting bolts must be carefully tightened, and the SDM arrow must be pointing toward the front of the vehicle to ensure proper operation of the SIR system. The SDM could be activated if it is powered when it is not rigidly attached to the vehicle, resulting in unexpected deployment and possible injury.