Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) contains sensing devices that convert vehicle velocity changes to electrical signals. The SDM processes the generated electrical signals and compares them to values stored in memory. When the generated signals exceed the stored values, 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 inflator modules. DTC B0053 will set along with DTC B0051 when a deployment occurs while a circuit malfunction is present in any one of the deployment loops.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0053 Deployment Commanded with Loop DTCs Present
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The DTC will set if one of the following conditions occurs:
| • | The SDM detects a frontal crash of sufficient force to warrant deployment of the frontal inflator modules. |
| • | The SDM detects a side impact crash of sufficient force to warrant deployment of a side inflator module. |
Action Taken When the DTC Sets
| • | The SDM sets DTC B0051. |
| • | The SDM sets DTC B0053. |
| • | The SDM commands the AIR BAG warning lamp 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 diagnostic table.
Diagnostic Aids
When DTC B0053 is accompanied by additional DTCs, other than B0051, repair the malfunction causing the other DTCs before replacing SDM.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the vehicle show any signs of air bag deployment? | Go to Step 5 | Go to Step 3 |
3 | Inspect the vehicle and undercarriage for signs of impact/collision. Does the vehicle show any signs of impact/collision? | Go to Step 5 | Go to Step 4 |
4 | Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 6 | -- |
5 | Replace all the components and perform inspections as required following an accident. Refer to Repairs and Inspections Required After a Collision . Did you complete the appropriate inspections and necessary repairs? | Go to Step 6 | -- |
6 |
Does the DTC reset? | Go to Step 2 | -- |
