B0040

Diagnostic Chart 1 Of 2:

Diagnostic Chart 2 Of 2:

Schematics:

CIRCUIT DESCRIPTION
When you first turn ON the ignition, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. Then the SDM performs the following continuous diagnostic tests on the deployment loops:
^ Deployment loop voltage out of range test
^ Deployment loop resistance measurement test

If the voltage out of range test detects a short to voltage condition, the resistance measurement test for that deployment loop will not be performed.

CONDITIONS FOR RUNNING THE DTC
^ Ignition 1 voltage is within the normal operating voltage range.
^ Driver side deployment loop is not open.
^ Driver side deployment loop is not shorted to voltage.
^ Driver side deployment loop is not shorted to ground.

CONDITIONS FOR SETTING THE DTC
Driver side deployment loop resistance is less than 1.3 ohms for 300 milliseconds.

ACTION TAKEN WHEN THE DTC SET
The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

CONDITIONS FOR CLEARING THE DTC
^ You can issue a CLEAR CODES command
^ A history DTC will clear once 255 malfunction free ignition cycles have occurred

DIAGNOSTIC AIDS
The following can cause an intermittent condition:
^ A short between the driver side high and the driver side low circuits
^ A malfunctioning shorting bar on the inflatable restraint driver seat module yellow 2-way connector.
^ Refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks the inflatable restraint driver seat module yellow 2-way connector.
5. This step checks to see if there is a malfunctioning inflatable restraint driver seat module.
7. This step determines if there is a short between the driver side high and the driver side low or if there is a malfunctioning SDM.