DTC 36 - Discriminating Sensor Closed Or Short To Ignition

WARNING: This page is about a different car, the 1995 Suzuki Swift and 1995 Geo Metro. However, it is still accessible from the selected car via links, so may be relevant.

Every time ignition switch is turned to ON position, SDM performs a series of self tests to check for internal malfunctions. If no internal faults are detected, SDM measures voltages in ignition 1, 36 VLR (back-up power supply), and deployment loop circuits. If all of these circuit voltages are within pre-defined parameters, SDM will measure resistance of inflator modules. Next phase of self diagnostics is Continuous Monitoring. During this phase, SDM supplies reference voltage to B6 terminal and measures voltage signal return from forward discriminating sensor at B5 terminal. SDM will set code 36 if signal return voltage is greater than pre-determined limit for about 1/2 second. If this fault occurs intermittently, most probable cause is a damaged SIR wiring harness.

NOTE: Test numbers below refer to test numbers in chart.

Measures resistance of forward discriminating sensor.
Checks for a short circuit between Reference Voltage and Sensor Signal circuits.
Checks for a short circuit between Reference Voltage circuit and battery power.
Checks for a short circuit between Sensor Signal circuit and battery power.

WARNING: To avoid air bag deployment and injury when trouble shooting system, only use test equipment specified in diagnostic charts. Under no circumstances should battery powered test equipment or test light be used. Carefully follow all instructions.

Fig 1: DTC 36 - Discriminating Sensor Closed Or Short To Ignition

Courtesy of GENERAL MOTORS CORP.