AIR BAG Indicator Does Not Come ON

CIRCUIT DESCRIPTION

SIR Schematics: Power, Ground, Serial Data, Indicator and Front Inflatable Restraint Modules:

SIR Schematics: Seat Belt Pretensioners, Side Inflatable Restraint Modules, and Sensors:

When the ignition is turned ON, the Inflatable Restraint Sensing And Diagnostic Module (SDM) flashes the AIR BAG indicator seven times. The SDM performs diagnostic tests on the SIR system and then turns the AIR BAG indicator OFF if no SIR malfunctions exists. If the ignition 1 voltage is outside of the normal operating range (9-16 volts), the SDM will turn the AIR BAG indicator ON with no DTCs present.

DIAGNOSTIC AIDS
The AIR BAG indicator will turn ON if the SDM connector is damaged or not properly connected to the SDM. The AIR BAG indicator will also turn ON if the shorting bar that is located within the SDM connector is damaged. In order to disable the shorting bar from the AIR BAG indicator control circuit and the SDM ground circuit within the SDM connector, the following conditions must be met:
^ The SDM connector must be properly connected to the SDM.
^ The Connector Position Assurance (CPA) must be properly installed to the SDM connector.

TEST DESCRIPTION

Steps 1-10:

3. Tests to see if the BRAKE indicator turns ON.
5. Tests to see if there is an open or a high resistance in the AIR BAG indicator control circuit.
7. Tests to see if there is an open or a high resistance in the AIR BAG indicator voltage feed circuit.