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 generated electrical signal 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 2 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 of the vehicle, of sufficient force to warrant deployment of the air bags.
Action Taken When the DTC Sets
| • | The SDM sets 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. You may not clear a latched code. 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 DTCs before installing a new SDM.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
If the inflator module(s) has not deployed, DTC B1053 may have set falsely.
-
If DTC B1053 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? | -- | Go to Step 2 | |
Turn the ignition switch to the OFF position. Has the inflator modules deployed? | -- | Go to Step 5 | Go to Step 3 | |
Inspect the front of the vehicle and the undercarriage for signs of impact. Are there signs of impact? | -- | Go to Step 5 | Go to Step 4 | |
4 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | Go to Step 6 | -- |
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? | -- | Go to Step 6 | -- |
6 |
Have all the SIR components been reconnected and properly mounted? | -- | -- |
