AIR BAG Indicator Circuit Malfunction

AIR BAG INDICATOR CIRCUIT MALFUNCTION

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 PC malfunction
- An internal SDM malfunction

TEST

Steps 1-5: