Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) contains sensing devices that converts vehicle velocity changes to an electrical signal. The SDM processes the generated electrical signals and compares it to a value stored in memory. When the generated signals 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 and causing DTC B0051 to set.
Conditions for Running the DTC
Ignition voltage must be present to the SDM.
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. |
| • | The SDM detects a side impact crash of sufficient force to warrant deployment of a side air bag. |
Action Taken When the DTC Sets
| • | 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 B0051 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
If the inflator module(s) has not deployed, DTC B0051 may have set falsely.
-
If DTC B0051 has set with no signs of frontal impact, the DTC may have falsely.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform A Diagnostic System Check - SIR? | -- | Go to Step 2 | |
Does the vehicle show any signs of inflator module(s) deployment? | -- | Go to Step 5 | Go to Step 3 | |
Inspect the front of 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 Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- |
5 |
Did you complete the appropriate inspections and necessary repairs? | -- | Go to Step 6 | -- |
6 |
Did you complete the action? | -- | -- |
