B0028

CIRCUIT DESCRIPTION

SIR Schematics (Pickup): DLC, Inflatable Restraint Sensing And Diagnostic Module:

SIR Schematics (Utility): DLC, Fuse Block, Inflatable Restraint Sensing And Diagnostic Module:

SIR Schematics (Utility): Side Impact Sensors, Diagnostic Module:

SIR Schematics (30 Series Pickup): Fuse Block, Inflatable Restraint Sensing And Diagnostic Module:

The inflatable restraint side impact module deployment loop consists of a side impact module, side impact module high control circuit, and side impact module low control circuit. A shorting bar is used on the side impact module connector which will short together the side impact module high and side impact module low control circuits when the connector is disconnected. This will help to prevent unwanted deployment of the inflator module during servicing. When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected a DTC will be stored.

CONDITIONS FOR RUNNING THE DTC
Ignition 1 voltage is within the normal operating voltage range.

CONDITIONS FOR SETTING THE DTC
The SDM detects the resistance between the RF side impact module high and RF side impact module low control circuits is less than 1.3 ohms for 500 milliseconds.

ACTION TAKEN WHEN THE DTC SETS
The SDM commands ON the AIR BAG indicator via Class 2 serial data.

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the DTC no longer exists.
^ You issue a scan tool CLEAR DTCs 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 RF side impact module high and RF side impact module low control circuits
^ A malfunctioning shorting bar on the RF side impact module connector

Refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-9:

The numbers below refer to the step numbers en the diagnostic table.
2. This step inspects the RF side impact module in-line connector.
5. Tests for a malfunctioning RF side impact module.
6. Tests for a short between the RF side impact module high and RF side impact module low control circuits.