AIR BAG Indicator Always On

SIR Schematics:

CIRCUIT DESCRIPTION
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 exist. 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 1-7:

Steps 8-18:

The numbers below refer to the step numbers on the diagnostic table:
3. Tests to see if the ignition 1 voltage is more than 9 V
4. Tests to see if the ignition 1 voltage is more than 16V
5. Tests to see if the SDM connector retainer assembly is damaged or corroded
7. Tests to see if the SDM connector is damaged or corroded
9. Tests to see if the SDM connector properly seats into the SDM
11. Tests to see if there is a short to ground in the AIR BAG indicator control circuit
12. Tests to see if the SDM connector retainer assembly is damaged or corroded
14. Tests to see if the SDM connector is damaged or corroded
15. Tests to see it there is an open, high resistance, or a short to ground in the ignition 1 voltage feed circuit
16. Tests to see if there is an open or a high resistance in the SDM ground circuit