Circuit Description
The inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM) contains a sensing device which converts vehicle velocity changes to an electrical signal. The electrical signal detected is processed by the SDM and then compared to a value stored in memory. When the generated signal exceeds the stored value, additional signal processing is performed and the generated signals are compared to signals stored in memory. When two of the generated signals exceed the stored values, the SDM causes current to flow through the seat belt side buckle pretensioners deployment loops, firing the pretensioners and causing DTC 67 to set.
Conditions for Setting the DTC
The inflatable restraint sensing and diagnostic and seat belt pretensioner module (SDM) detects a frontal or rear crash, of sufficient force to warrant deployment of the pretensioners only.
Action Taken When the DTC Sets
| • | The SDM turns ON the AIR BAG warning lamp. |
| • | The SDM records the Crash Data. |
| • | The SDM sets a DTC 67. |
Conditions for Clearing the DTC
| • | Both the driver and passenger seat belt pretensioners must be replaced. |
| • | The scan tool CLEAR CODES command is issued. |
Test Description
The numbers below refer to the step numbers on the diagnostic table:
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Have all current and history SIR DTCs been cleared? | -- | -- |
