Circuit Description
With the ignition key in the OFF-UNLOCKED position, the AIR BAG warning lamp will illuminate steady. In the RUN position, the ignition switch applies battery voltage to the AIR BAG Fuse and to the inflatable restraint sensing and diagnostic module (SDM) IGNITION 1 input terminal 10. The SDM responds by commanding the instrument cluster, via SERIAL DATA (UART) line (CKT 800), to flash the AIR BAG warning lamp seven times. If serial data communication is lost between the SDM and the instrument cluster, the AIR BAG indicator will come on steady, with a DTC B1061 set. If IGNITION 1 voltage to the SDM is outside of the normal operating range, the AIR BAG warning lamp will come on steady with no DTCs set.
Conditions for Setting the DTC
The SDM receives an AIR BAG warning lamp fault message five consecutive times, via the SERIAL DATA (UART) line, from the instrument cluster and the SDM has not received a request from the instrument cluster to communicate, via the SERIAL DATA (UART) line, for six seconds.
Action Taken When the DTC Sets
| • | The SDM sets a Diagnostic Trouble Code. |
| • | The SDM attempts to turn ON the AIR BAG warning lamp. |
Conditions for Clearing the MIL/DTC
| • | Current DTC |
| The ignition switch is cycled. |
| • | History DTC |
| - | You issue a scan tool CLEAR CODES command. |
| - | Once 250 malfunction free ignition cycles have occurred. |
Diagnostic Aids
Refer to AIR BAG Warning Lamp Comes On Steady to diagnose warning lamp circuit malfunctions.
Test Description
The number below refers to the step number on the diagnostic table:
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Is DTC B1061 set? | -- |
