DTC 17

Circuit Description
When the ignition switch is turned ON, the sensing and diagnostic module (SDM) will perform tests to diagnose critical malfunctions within itself. After 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. Passenger low terminal 4 is grounded through a current sink. The passenger current source is connected to the passenger high terminal to allow a known amount of current to flow. By monitoring the voltage difference between passenger high and passenger low, the SDM calculates the combined resistance of the passenger inflator module, the harness wiring, and the connector terminal contacts.

DTC 17
DTC 17 will set when the resistance of the passenger deployment loop is above a specified value for 500 milliseconds. The resistance is monitored during the deployment loop continuity test and during continuous monitoring.

An open wire in the passenger deployment will also set DTC 17.

When DTC 17 is set, the SDM will turn on the AIRBAG indicator.

DTC 17 will clear when the resistance of the passenger deployment loop is below a specified value for 500 milliseconds during continuous monitoring.

Test Description
The numbers below refer to steps on the diagnostic table.
3. Refer to the first caution below.
8. Refer to the cautions below.

Diagnostic Aids
An intermittent condition is likely to be caused by a poor connection, either at the passenger airbag connector or at terminals 1 and 4 of the SDM.

Steps 1 - 6:

Steps 7 - 9:

DTC 17 - Passenger Deployment Loop Open

CAUTION: The sensing and diagnostic module (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, do not begin service until 10 minutes have passed after disconnecting power to the SDM. Otherwise, injury could result.

CAUTION: Never measure the resistance of an inflator module with an ohmmeter. The ohmmeter battery could unexpectedly deploy the airbag which would created the possibility of severe injury and would require the replacement of otherwise useable components.

CAUTION: During service procedures, be very careful when handling the SDM. Never strike or jar the SDM. Never power the supplemental inflatable restraints (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 it it is powered when it is not rigidly attached to the vehicle, resulting in unexpected deployment and possible injury.