Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) receives a signal fron the inflatable restraint Side Impact Sensor (LH) which contains a sensing device which converts changes in velocity at the LH B-pillar 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 inflatable restraint driver seat module, deploying the driver side air bag and causing DTC B1057 to set.
Conditions for Setting the DTC
The inflatable restraint sensing and diagnostic module (SDM) detects a side impact of sufficient force to warrant deployment of the driver side air bag.
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 diagnostic trouble code. |
Conditions for Clearing the DTC
Current and History DTC codes must be cleared using a scan tool Clear DTC Information command. If the circuit fault has been successfully repaired and the conditions which caused the Current DTC B1057 to set are no longer existing, History DTC B1057 will set. History DTC B1057 may be cleared using the scan tool. The SDM must be replaced after three driver side air bag deployments or if Current DTC B1057 cannot be cleared.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
DTC B1057 may have set falsely if the driver side airbag inflator module has not deployed.
-
The DTC has set falsely if DTC B1057 has set with no signs of driver side impact.
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This test checks for an SDM malfunction setting in the DTC.
-
DTC B1057 may have set falsely while diagnosing the vehicle.
CAUTION: Be careful when you handle a sensing and diagnostic module (SDM). Do
not strike or jolt the SDM. Before applying power to the SDM:
• Remove any dirt, grease, etc. from the mounting surface • Position the SDM horizontally on the mounting surface • Point the arrow on the SDM toward the front of the vehicle • Tighten all of the SDM fasteners and SDM bracket fasteners to
the specified torque value
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
2 | Turn the ignition switch to the OFF position. Did the driver side inflator module deploy? | -- | ||
Are signs of impact evident? | -- | |||
Is DTC B1057 set? | -- | |||
Replace the removed components and perform the inspections required following an accident. Refer to Repairs and Inspections Required After a Collision . Have the appropriate inspections and repairs been made? | -- | -- | ||
6 | Turn the ignition switch to the OFF position. Was DTC B1057 set when the SIR Diagnostic System Check was first performed? | -- | ||
Is the replacement complete? | -- | -- | ||
8 | Replace the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the replacement complete? | -- | -- | |
9 | Reconnect all the removed SIR system components, make sure all the components are properly mounted. Have all the SIR components been reconnected and properly mounted? | -- | -- |
