DTC 26

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 A7 is grounded through a current sink, and the driver current source is connected to the driver high terminal 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 harness wiring, and the connector terminal contacts.

DTC 26 Will Set When
The resistance of the driver deployment loop is above a specified value for 100 milliseconds. The resistance is monitored during the deployment loop continuity test and continuous monitoring.

Action Taken
The SDM will turn on the AIRBAG indicator and set a diagnostic trouble code (DTC) 26.

DTC 26 Will Clear When
The voltage measured at driver low is below a specified value for 100 milliseconds or the ignition is turned OFF.

Diagnostic Aids
An intermittent condition is likely to be caused by a poor connection, either at the driver airbag or clock spring connectors or SDM terminals A6 and A7. An open wire in the driver deployment loop will also set DTC 26. To test for a faulty SIR clock spring, clear the DTCs, then turn the steering wheel back and forth with the ignition switch ON. If the AIRBAG indicator comes on and DTC 26 has set again, it is likely that the clock spring is faulty.

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

4. This test establishes that the problem is either in the clock spring or the driver airbag.
7. See the important below.
10. See the first caution below.
14. See the cautions below.

Steps 1 - 7:

Steps 8 - 14:

DTC 26 - Driver Deployment Loop Open

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 air - bags 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.

Important: Avoid deforming the terminals of the clock spring-to-airbag connector.