Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2010 Ford Focus S, AutomaticFACTORY OEM SERVICE PROCEDURE
Occupant Classification System Module (OCSM) DTC Chart
Occupant Classification System Module (OCSM) DTC Chart
| DTC | Description | Action To Take |
|---|---|---|
| B1231 | Event Threshold Exceeded | INSTALL a new Occupant Classification Sensor (OCS) system service kit and CLEAR all Restraints Control Module (RCM) and Occupant Classification System Module (OCSM) DTCs. REFER to OCCUPANT CLASSIFICATION SENSOR and INSPECTION AND REPAIR AFTER A SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPLOYMENT . |
| B1317 | Battery Voltage High | GO to PINPOINT TEST Y . |
| B1318 | Battery Voltage Low | GO to PINPOINT TEST Y . |
| B1342 | ECU Is Faulted | INSTALL a new OCS system service kit. REFER to OCCUPANT CLASSIFICATION SENSOR . |
| B2290 | Occupant Classification System Fault | GO to PINPOINT TEST E . |
| B2909 | Belt Tension Sensor Fault | GO to PINPOINT TEST T . |
| C1941 | Zero Seat Weight Test Failure | Can only be reported when carrying out OCS System Reset. REFER to OCCUPANT CLASSIFICATION SENSOR . |
| U0100 | Lost Communication With ECM/PCM | REFER to MODULE COMMUNICATIONS NETWORK to diagnose the communication concern. |
| U0151 | Lost Communication With Restraints Control Module | REFER to MODULE COMMUNICATIONS NETWORK to diagnose the communication concern. |
| U2050 | No Application Present | INSTALL a new OCS system service kit. REFER to OCCUPANT CLASSIFICATION SENSOR . |
| U2051 | One or More Calibration Files Missing/Corrupt | INSTALL a new OCS system service kit. REFER to OCCUPANT CLASSIFICATION SENSOR . |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.