DTC 19

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" voltage is within the normal operating range. The voltage of both "Driver 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 is set. This test is run during "Turn-ON" tests and every 100 milliseconds during "Continuous Monitoring."

ACTION TAKEN

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

DTC WILL CLEAR WHEN

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

DTC CHART TEST DESCRIPTION

Numbers below refer to circled numbers 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 checks for a malfunctioning passenger inflator module.

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

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

DIAGNOSTIC AIDS

An intermittent condition is likely to be caused by a short to 13+ in the passenger inflator module circuit. Inspect CKTs 1403 and CKT 1404 carefully for cutting or chafing. If the wiring pigtail of the passenger inflator module is damaged the component must be replaced.