DTC 36

***This procedure has been updated by TSB 63-90-06, April, 1996***

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 then proceeds to "Continuous Monitoring". The SDM contains a resistor network connected to "Ignition 1", ground, and to SDM "Sensor Signal" terminal "2".

The 8.45K ohms resistor in the front end discriminating sensor parallel to the normally open switch provides a parallel path to ground causing a specified percentage of voltage to appear at the SDM "Sensor Signal" input. This voltage is monitored to detect shorts to voltage or an open discriminating sensor circuit.

DTC WILL SET WHEN
"Ignition 1" is within the normal operating voltage range and the SDM is configured for a discriminating sensor. Once these conditions are met and the voltage measured at the discriminating sensor input is above a specified value for 500 milliseconds, DTC 36 will set.

ACTION TAKEN
SDM turns "ON" the "AIR BAG" waining lamp and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN
The voltage measured at "Sensor Signal" terminal "2" is in its normal range for 500 milliseconds during "Continuous Monitoring."

DTC CHART TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.

1. This test checks for a malfunctioning discriminating sensor.

2. This test checks for an an open in CKT Gr/B.

3. This test checks for an open in CKT Gr.

DIAGNOSTIC AIDS
Intermittent shorts or opens can be located by moving wires while monitoring the "AIR BAG warning lamp.