Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts changes in vehicle velocity to an electrical signal. The SDM compares this 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 instead of DTC B0051 when a deployment occurs while an inflator circuit fault is present that may result in a non-deployment situation in one or more of the inflator modules.
Conditions for Running the DTC
The SDM must be powered up.
Conditions for Setting the DTC
Ignition 1 voltage must be present and the SDM must have commanded an air bag deployment with inflator circuit faults.
Action Taken When the DTC Sets
| • | The SDM commands the AIR BAG indicator ON 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 following diagnostic table.
Diagnostic Aids
When DTC B0053 is accompanied by additional DTCs, other than B0051, repair the malfunction causing the other DTCs before replacing the SDM.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - SIR? | Go to Step 2 | |
2 |
Does the vehicle exhibit any signs of air bag deployment? | Go to Step 5 | Go to Step 3 |
3 | Inspect the vehicle and undercarriage for signs of impact or collision. Does the vehicle exhibit any signs of impact or collision? | Go to Step 5 | Go to Step 4 |
4 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | Go to Step 6 | -- |
5 | Replace all components and perform inspections as required following a collision. Refer to Repairs and Inspections Required After a Collision . Did you complete the appropriate inspections and necessary repairs? | Go to Step 6 | -- |
6 |
Did you complete the repair? | -- |
