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 inflator modules and the pretensioner modules, deploying the air bags and the seat belt pretensioners and causing DTC B1051 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 B1051. |
| • | The SDM turns ON the AIR BAG warning lamp. |
| • | The SDM records crash data. |
Conditions for Clearing the DTC
DTC B1051 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
If the inflator module(s) has not deployed, DTC B1051 may have set falsely.
-
If DTC B1051 has set with no signs of frontal impact, the DTC has set falsely.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Turn the ignition switch to the OFF position. Has the inflator modules and seat belt pretensioners deployed? | -- | |||
Inspect the front of the vehicle and the undercarriage for signs of impact. Are there signs of impact? | -- | |||
4 | Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | -- | |
5 | Replace components and perform inspections as required following an accident. Refer to Repairs and Inspections Required After a Collision . Have the appropriate inspections and repairs been made? | -- | -- | |
6 | Reconnect all the SIR system components, making sure all the components are properly mounted. Have all the SIR components been reconnected and properly mounted? | -- | -- |
