Circuit Description
The inflatable restraint sensing and diagnostic module (SDM) contains a sensing device that converts vehicle velocity changes into 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 2 of the generated signals exceed the stored values, the SDM will cause current to flow through the inflator modules, deploying the side air bags and causing DTC B0055 to set.
This DTC is set when the SDM has commanded an air bag deployment with no faults present.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0055 Side Air Bag Deployment Commanded
Conditions for Running the DTC
Ignition 1 voltage must be present.
Conditions for Setting the DTC
Ignition voltage must be present and the SDM must have commanded an air bag deployment.
Action Taken When the DTC Sets
| • | The SDM sets a DTC B0055. |
| • | The SDM commands the AIR BAG warning lamp ON via GMLAN serial data. |
| • | The SDM records crash data. |
Conditions for Clearing the DTC
DTC B0055 is a latched code. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
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 |
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 |
Did you complete the repair? | -- |
