B0024

SIR Schematics:

CIRCUIT DESCRIPTION
The inflatable restraint steering wheel module deployment loop consists of the inflatable restraint steering wheel module, the inflatable restraint steering wheel module coil, the steering wheel module high circuit, and the steering wheel module low circuit. A shorting bar is used in the inflatable restraint steering wheel module coil connector to short the steering wheel module high and steering wheel module low circuits when the connector is disconnected. This will prevent unwanted deployment of the steering wheel module during servicing. When the ignition is turned ON, the Inflatable Restraint Sensing And Diagnostic Module (SDM) performs continuous diagnostic tests on the deployment loop to check for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, the SDM will store a Diagnostic Trouble Code (DTC).

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

CONDITIONS FOR SETTING THE DTC
The DTC will set if one of the following conditions occurs:
^ Steering wheel module high circuit is more than 6 volts for 500 milliseconds during the deployment loop voltage out of range test.
^ Steering wheel module high circuit is less than 2.4 volts and the steering wheel module deployment loop resistance is less than 6 ohms for 500 milliseconds during the deployment loop resistance measurement test.

ACTION TAKEN WHEN THE DTC SETS
The SDM turns the AIR BAG indicator ON.

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the DTC no longer exists and the scan tool Clear DTC's function is used.
^ A history DTC will clear once 255 malfunction free ignition cycles have occurred

DIAGNOSTIC AIDS
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in misdiagnosis, causing a part replacement with the reappearance of the malfunction. The following are possible causes of the malfunction:
^ A short to ground or a short to voltage in the steering wheel module high or steering wheel module low circuits
^ The steering wheel module upper coil connector
^ The steering wheel module coil connector
^ The SDM connector
^ An internal SDM malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-3:

Steps 4-12:

The number(s) below refer to the step number(s) on the diagnostic table.
4. Tests to see if the malfunction is intermittent
6. Test to see if the malfunction is caused by the steering wheel module or the steering wheel module coil
10. Tests to see if there is a short to ground or a short to voltage in the steering wheel module high or steering wheel module low circuits