DTC 19

Wiring Diagram:

CIRCUIT DESCRIPTION

When the ignition switch is turned to "ON," 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 "10" and "Passenger Side Low" terminal "3" to detect shorts to ground 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 below a specified value. Once these conditions are met and the voltage at "Passenger Side Low" is above 3.5 volts for 500 milliseconds, 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 DTC 19 and also DTC 71.

DTC WILL CLEAR WHEN

The malfunction is no longer occurring (has been repaired) and the SDM has been replaced. DTC 19 is a latched code (cannot be cleared).

DTC CHART TEST DESCRIPTION

Numbers below refer to circled numbers on the diagnostic chart.

1. Recording "Pass. Senselo" may help to locate the fault.

2. This test checks for a malfunctioning passenger inflator module.

3. This test determines whether the malfunction is in CKT Y/R.

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

DIAGNOSTIC AIDS

The "Pass. Senselo" value displayed by the TECH 1 is updated continuously so that intermittent shorts can be located by moving wires while monitoring "Pass. Senselo." An intermittent condition is likely to be caused by a short to ground in the passenger inflator module circuit. Inspect CKTs Y/R and CKT Y carefully for cutting or chafing. If the wiring pigtail of the passenger inflator module is damaged the component must be replaced. A careful Inspection of the circuits and components Indicated on the DTC 19 chart including the passenger module module pigtail is essential to ensure that the replacement SDM will not be damaged.