Important: The seat belt pretensioners may deploy for impacts that are not severe enough to warrant frontal or side air bag deployment. The SDM is capable of sustaining 3 pretensioner deployment events, or one frontal or side deployment event. After the maximum number of deployments has occurred, DTC B0051 becomes a latched code, which cannot be cleared.
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 deployment loops, deploying the air bags and/or pretensioners causing DTC B0051 to set.
This diagnostic procedure supports the following DTC:
DTC B0051 Deployment Commanded
Ignition 1 voltage must be within the normal operating range.
The DTC will set if one of the following conditions occurs.
• | The SDM detects a frontal impact of sufficient force to warrant deployment of the frontal inflator modules and/or pretensioners. |
• | The SDM detects a side impact of sufficient force to warrant deployment of a roof rail inflator module. |
• | The SDM commands the AIR BAG warning lamp ON via Class 2 serial data. |
• | The SDM records crash data. |
DTC B0051 can be cleared if the following conditions are met.
• | Three consecutive seat belt pretensioner deployment events have not occurred |
• | One frontal or side air bag deployment has not occurred. |
• | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used. |
• | A history DTC will clear once 255 malfunction-free ignition cycles have occurred. |
DTC B0051 becomes a latched code after 3 consecutive pretensioner deployments or one frontal or side air bag deployment. You cannot clear a latched code. Replace the SDM after following the instructions in the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the vehicle show any signs of inflator module or pretensioner deployment? | Go to Step 4 | Go to Step 3 |
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 4 | Go to Step 5 |
4 |
Did you complete the action? | Go to Step 5 | -- |
5 | Use the scan tool to attempt to Clear DTC B0051. Has DTC B0051 been cleared successfully? | Go to Step 7 | Go to Step 6 |
6 |
Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |