Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts vehicle velocity changes to an electrical signal. The SDM processes the generated electrical signal and compares it to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional signal processing and compares the generated signals to signals stored in memory. When two of the generated signals exceed the stored values, the SDM will cause current to flow through the frontal inflator modules. This deploys the air bags and causes DTC B1151and B1152 to set.
Conditions for Setting the DTC
The SDM detects a frontal crash, up to 30 degrees off the centerline of the vehicle, of sufficient force to warrant deployment of the air bags.
Action Taken When the DTC Sets
| • | The SDM sets a DTC B1151 and DTC B1152. |
| • | The SDM commands the instrument panel cluster (IPC) to turn ON the AIR BAG warning lamp |
| • | The SDM records the crash data. |
| • | The SDM sends a message over the serial data line class 2. |
Conditions for Clearing the MIL/DTC
A scan tool CLEAR DTCs command is received by the SDM.
Step | Action | Value(s) | Yes | No |
1 | Was the SIR Diagnostic System Check performed? | -- | ||
2 | Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Have the repairs been completed? | -- | -- |
