B1018

SIR Schematics:

Inflatable Restraint IP Module:

Inflatable Restraint Sensing And Diagnostic Module:

Inflatable Restraint Steering Wheel Module Coil:

CIRCUIT DESCRIPTION
The inflatable restraint IP module deployment loop consists of an inflatable restraint IP module, the IP module high and IP module low circuits. A shorting bar is used in the inflatable restraint IP module connector which will short together the IP module - high and IP module low 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 DTC will set if one of the following conditions occurs:
^ The IP module high input is more than 6 volts for 500 milliseconds.
^ The IP module high input is less than 2 volts and IP module deployment loop resistance is less than 4.5 ohms for 500 milliseconds.

ACTION TAKEN WHEN THE DTC SETS
The SDM commands 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 DTCs function is used.
^ A history DTC will clear once 250 malfunction tree 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 a 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 IP module high or the IP module low circuits.
^ A malfunctioning inflatable restraint IP module.
^ An internal SDM malfunction.

If an intermittent malfunction exists, 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.
4. Tests to see if the malfunction is intermittent.
5. Tests to see if the malfunction is caused by the inflatable restraint IP module.
8. Tests for a short to ground or voltage in the IP Module High and IP Module Low circuits.