Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device (accelerometer) that converts vehicle velocity changes to an electrical signal. The SDM compares this 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 values 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 B0053 will set along with DTC B0051 when a deployment occurs while an inflator circuit fault is present that could possibly result in a non-deployment situation in one or more 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 frontal air bags.
Action Taken When the DTC Sets
| • | The SDM sets a DTC B0051. |
| • | The SDM sets a DTC B0053. |
| • | The SDM commands ON the AIR BAG warning lamp via Class 2 serial data. |
| • | The SDM records crash data. |
Conditions for Clearing the DTC
DTC B0053 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
Diagnostic Aids
DTC B0053 will be accompanied by another DTC (other than DTC B0071). 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 B0053 may have set falsely.
-
If DTC B0053 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 module(s) 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 replacement complete? | -- | -- | |
5 |
Have the appropriate inspections and repairs been made? | -- | -- | |
6 | Reconnect all the SIR system components, make sure all the components are properly mounted. Have all the SIR components been reconnected and properly mounted? | -- | -- |
