B0022

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. 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 Setting the DTC

^ Ignition 1 voltage is within the normal operating voltage range.

^ Driver frontal deployment loop is not open.

^ Driver frontal deployment loop is not shorted to voltage.

^ Driver frontal deployment loop is not shorted to ground.

^ Driver frontal deployment loop resistance is less than 1.3 ohms for 300 milliseconds.

The driver frontal deployment loop consists of the following components:

^ Inflatable Restraint Steering Wheel Module.

^ Inflatable Restraint Steering Wheel Module Coil.

^ Harness wiring of circuit 347.

^ Harness wiring of circuit 348.

^ Connector terminal contact.

This malfunction is detected during the deployment loop resistance measurement test.

Action Taken When the DTC Sets

^ The SDM sets a DTC B0022.

^ The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

Conditions for Clearing the DTC

^ Current DTC

The resistance of the driver frontal deployment loop is at least 1.3 ohms or more for 300 milliseconds.

^ History DTC

- You issue a scan tool CLEAR CODES command.

- Once 250 malfunction free ignition cycles have occurred.

Diagnostic Aids

The following can cause an intermittent condition:

^ A short between circuit 347 and circuit 348.

^ A malfunctioning shorting bar on the Inflatable Restraint Steering Wheel Module 2-way connector.

^ A malfunctioning shorting bar on the Inflatable Restraint Steering Wheel Module Coil side of inline connector C215.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

2. This step checks the inline connector C215.

6. This step determines if the Inflatable Restraint Steering Wheel Module Coil or if the Inflatable Restraint Steering Wheel Module is defective.

9. This step determines if there is a short between circuit 347 and circuit 348 or if there is a malfunctioning SDM.