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 the signal to a value stored in memory. If 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, deploying the air bags. DTC B1053 will set instead of a DTC B1051 when a deployment occurs while an inflator circuit fault is present that could possibly result in a non-deployment situation in one or both inflator modules.
Conditions for Setting the DTC
The SDM detects a frontal crash, up to 30 degrees off the centerline on the vehicle, of sufficient force to warrant deployment of the air bags.
Action Taken When the DTC Sets
| • | The SDM detects a diagnostic trouble code. |
| • | The SDM turns ON the AIR BAG warning lamp. |
| • | The SDM records crash data. |
Conditions for Clearing the DTC
DTC B1053 is a latched code. Latched codes cannot be cleared. Replace the SDM after following the instructions in the diagnostic table.
Diagnostic Aids
DTC B1053 will be accompanied by another DTC (other than DTC B1071). Repair the malfunction causing the other DTC(s) before installing a new SDM.
Test Description
Numbers below refer to step numbers on the diagnostic table:
-
If the inflator module has not deployed, DTC B1053 may be set falsely.
-
If DTC B1053 has set with no signs of frontal impact, the diagnostic trouble code has set falsely.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Turn the ignition switch to the LOCK position. Has the inflator module deployed? | -- | |||
Inspect the front of the vehicle and the undercarriage for signs of impact. Are signs of impact visible? | -- | |||
4 | Replace the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Have you replaced the SDM? | -- | -- | |
5 | Replace the components and perform the necessary inspections. Refer to Repairs and Inspections Required After a Collision . Have you completed the appropriate repairs and inspections? | -- | -- | |
6 | Reconnect and mount all of the SIR system components. Have you reconnected and properly mounted all of the SIR components? | -- | -- |
