B0036

Schematic:

CIRCUIT DESCRIPTION
When you first turn the ignition switch to the RUN position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM then measures the following circuits to ensure they are within their respective normal voltage ranges:
^ Ignition positive voltage
^ 23 VLR
^ Deployment loop voltages
The SDM then proceeds to CONTINUOUS MONITORING. The SDM contains a resistor network connected to 5 Volts, ground, and to the SDM discriminating sensor signal input terminal A11. The SDM monitors two front end discriminating sensors that are wired in parallel. The 1.0 K Ohm resistor located in the RH inflatable restraint front end discriminating sensor is parallel to the normally open switches in both sensors and provides a parallel path to ground. This causes a specified percentage of voltage to appear at the SDM discriminating sensor signal input. The SDM monitors this voltage to detect shorts to power or an open discriminating sensor.

CONDITIONS FOR SETTING THE DTC
^ The SDM is configured for inflatable restraint front end discriminating sensors.
^ The voltage at the discriminating sensor signal input terminal A11 is more than 3.65 Volts for 5 consecutive samples.

The CONTINUOUS MONITORING test checks for this DTC. This test occurs when ignition positive voltage is within the normal operating voltage range.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM sets DTC B0036.
^ The SDM commands ON the AIR BAG warning indicator via class 2 serial data.

CONDITIONS FOR CLEARING THE DTC
^ Current DTC - The voltage at the discriminating sensor signal input terminal A11 is 3.65 Volts or more for 5 consecutive samples.
^ History DTC
- You issue a scan tool CLEAR CODES command.
- After 255 malfunction free ignition cycles have occurred.

DIAGNOSTIC AIDS
A broken or chafed wire in the inflatable restraint front end discriminating sensor circuits may cause an intermittent condition. Inspect CKT 2160 and CKT 2151 carefully for cutting or chafing.

TEST DESCRIPTION

Test Step 1 - Step 11:

Test Step 12 - Step 20:

Test Step 21 - Step 25:

The numbers below refer to the step numbers on the diagnostic table:
2. Tests for proper terminal contact of the yellow 2-way connector.
5. Tests for a malfunctioning discriminating sensor.
6. Tests for an open in the discriminating sensor ground circuit.
9. Test isolates an open in the discriminating sensor ground circuit to one side of the in-line connector.
12. Tests for proper terminal contact of the inflatable restraint sensing and diagnostic module (SDM) connector.
15. Tests for an open in the discriminating sensor signal circuit.
18. Test isolates an open in the discriminating sensor signal circuit to one side of the in-line connector.
21. Tests for a short to voltage in the discriminating sensor signal circuit.