Circuit Description
When the ignition is turned ON, the instrument panel cluster (IPC) flashes the AIR BAG indicator seven times. The inflatable restraint sensing and diagnostic module (SDM) performs diagnostic tests on the SIR system and then commands the IPC to turn the AIR BAG indicator OFF if no SIR malfunction exists. The AIR BAG indicator is controlled by the SDM via Class 2 serial data. If the ignition 1 voltage is outside of the normal operating voltage range 9-16 volts, the SDM will command the IPC to turn the AIR BAG indicator ON with no diagnostic trouble codes (DTCs) present.
Diagnostic Aids
If battery voltage is outside of the normal operating voltage range, 9-16 volts, the AIR BAG warning indicator will come ON solid with no DTCs set. For more detailed information concerning the Class 2 data lines, refer to Data Link Communications Description and Operation in Data Link Communications.
The following are possible causes of the malfunction:
| • | Ignition voltage out of range |
| • | An internal IPC malfunction |
| • | An internal SDM malfunction |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - SIR? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the ignition voltage is within the specified range? | 9-16 V | Go to Step 3 | Go to Diagnostic System Check - Engine Electrical in Engine Electrical |
3 |
Does scan tool command the AIR BAG Warning Indicator ON then OFF? | -- | Go to Step 4 | Go to Step 5 |
4 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | -- | -- | |
5 | The AIR BAG warning indicator is not serviceable separately. The instrument panel cluster (IPC) must be service as a complete unit. Refer to in Instrument Cluster Replacement Instrument Panel, Gages, and Console. Did you complete the repair? | -- | -- | |
