B1058

Diagnostic Chart:

Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) receives a signal from the inflatable restraint Side Impact Sensor (RH) which contains a sensing device which converts changes in velocity at the RH 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 passenger seat module, deploying the passenger side air bag and causing DTC B1058 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 passenger 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 B1058 to set are no longer existing, History DTC B1058 will set. History DTC B1058 may be cleared using the scan tool. The SDM must be replaced after three passenger side air bag deployments or if Current DTC B1058 cannot be cleared.

Test Description
The numbers below refer to the step numbers on the diagnostic table:
3. DTC B1057 may have set falsely if the passenger side airbag inflator module has not deployed.
4. The DTC has set falsely if DTC B1058 has set with no signs of passenger side impact.
5. This test checks for an SDM malfunction setting in the DTC.
7. DTC B1058 may have set falsely while diagnosing the vehicle.

WARNING: 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

Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.