DTC 19

Circuit Description
When the ignition switch is turned 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 monitors the voltages at the driver low terminal (terminal 3) and the passenger low terminal (terminal 4) to detect shorts to voltage in the deployment loops.

DTC 19
DTC 19 will set when the voltage at the passenger low terminal rises above a specified value while the driver low terminal is below that value and Ignition 1 is within the normal operating voltage range. This test is run during turn-on tests and every 100 milliseconds during continuous monitoring.

When DTC 19 is set, the SDM will turn on the AIRBAG indicator.

DTC 19 will clear when the voltage measured at the passenger low terminal is below a specified value for 500 milliseconds.

Diagnostic Aids
An intermittent condition is likely to be caused by a short to voltage in the passenger deployment loop. Carefully inspect the wires in the passenger loop for cutting or chafing. If the wiring pigtail of the passenger airbag is damaged, the passenger airbag must be replaced.

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

Steps 1 - 6:

Steps 7 - 8:

DTC 19 - Passenger Deployment Loop Short to Voltage

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 if it is powered when it is not rigidly attached to the vehicle, resulting in unexpected deployment and possible injury.

Important: Replace any damaged SIR wires. Do not try to repair the wires because a high-resistance connection could make the airbags inoperative and set another DTC.