Circuit Description
In the RUN position, the ignition switch applies battery voltage to the AIR BAG warning lamp and to the Ignition Positive Voltage input terminal 10. The inflatable restraint sensing and diagnostic module (SDM) responds by flashing the AIR BAG warning lamp 7 times. The SDM monitors the lamp driver output by comparing the output state at the SIR Indicator terminal 7 to the microprocessor commanded state.
Conditions for Setting the DTC
The output state at the SIR Indicator terminal 7 does not match the commanded state of the lamp driver for 400 milliseconds.
The Continuous Monitoring test checks for this DTC. This test occurs when Ignition 1 is within the normal operating voltage range.
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 DTC
| • | Current DTC |
| The output state at the SIR Indicator terminal 7 matches the commanded state of the lamp driver for 400 milliseconds. |
| • | History DTC |
| - | You issue a scan tool Clear DTCs command. |
| - | 250 ignition cycles have passed since the last malfunction. |
Diagnostic Aids
Refer to AIR BAG Warning Lamp Comes On Steady and to AIR BAG Warning Lamp Does Not Come On in order to diagnose warning lamp circuit malfunctions.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Is DTC B1061 set? | -- |
