DTC 19

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

When the ignition switch is turned to "RUN," the SDM will perform tests to diagnose critical malfunctions within itself. Upon passing these tests, "Ignition 1," 23 VLR and deployment loop voltages are measured to ensure they are within their respective normal voltage ranges. The SDM monitors the voltages at "Driver Side Low" terminal "3" and "Passenger Side Low" terminal "4" to detect shorts to B+ in the inflator module circuits.


DTC WILL SET WHEN:

"Ignition 1" is within the normal operating voltage range. The voltages of both "Drivers Side Low" and "Passenger Side Low" are NOT above a specified value. Once these conditions are met and the voltage at "Passenger Side Low" is above a specified value, DTC 19 will set. This test is run during "Turn-ON" tests and every 100 milliseconds during "Continuous Monitoring.


ACTION TAKEN:

SDM turns "ON" the "AIR BAG" indicator and sets a diagnostic trouble code.


DTC WILL CLEAR WHEN

The voltage measured at "Passenger Side Low" is below a specified value for 500 milliseconds.

DTC CHART TEST DESCRIPTION

Number(s) below refer to circled number(s) on the diagnostic chart.

1. Monitoring "Pass. Senselo" may help to locate the fault. The value displayed by the TECH 1 is updated continuously so that intermittent shorts can be located by moving wires while monitoring "Pass. Senselo."

2. This test isolates the malfunction to one side of the passenger inflator module yellow 2-way connector at the base of the steering column.

3. This test determines if the malfunction is in CKT 1403.

4. This test determines if the malfunction is in CKT 1404.


DIAGNOSTIC AIDS

An intermittent condition is likely to be caused by a short to B+ in the passenger inflator module circuit. Inspect CKTs 1403 and I 404 carefully for cutting or chafing. If the wire pigtail of the passenger inflator module is damaged, the component must be replaced.