What is a Toyota Corolla Hatchback airbag control unit?
The Toyota Corolla Hatchback airbag control unit is the central safety unit that activates all occupant restraint systems in the event of an accident. It monitors sensors, stores crash data, and ensures the proper functioning of all airbag modules and seatbelt pretensioners in the vehicle. Repair of this module may be necessary after an accident.
This SRS control unit is crucial for safety in the Toyota Corolla Hatchback. It communicates with front, side, curtain, and knee airbags, depending on the vehicle's equipment. The unit is typically manufactured by manufacturers such as TRW and supports on-board diagnostics (OBD).
Why is the Toyota Corolla Hatchback airbag control unit defective?
The Toyota Corolla Hatchback airbag control unit often fails because it stores crash data after an accident that needs to be erased, or because it experiences internal malfunctions such as memory errors. Communication problems or a failed self-test can also cause a failure, necessitating repair or replacement.
After an impact, the crash data is permanently stored in the control unit and cannot simply be reset. This requires special diagnostic and repair procedures to restore functionality. Internal electronic damage or faulty EEPROM contents are also common causes of failure that require repair.
If the airbag warning light stays on, this is a clear sign of a malfunction or defect in the system that requires accurate diagnosis.
Common error codes for Toyota Corolla Hatchback airbag control unit repair
During diagnostics for the Toyota Corolla Hatchback airbag control unit repair, specific error codes will appear that point directly to the control unit. These codes indicate internal problems, communication failures, or stored crash data that require professional repair to restore system integrity.
- **B1100:** Airbag Control Module Malfunction → This code indicates a direct internal malfunction of the control module that requires repair.
- **B1000:** Control unit communication error → The communication between the airbag control unit and other vehicle systems is disrupted, which affects error detection.
- **B1200:** Internal memory error in the control unit → A problem with the internal data memory of the airbag control unit has been detected, which is preventing data storage.
- **B121A:** Non-erasable crash data in the control unit → After an accident, crash data is permanently stored, which requires a professional reset of the control unit for it to function again.
- **B1201:** Faulty EEPROM contents → The data stored in the control unit's EEPROM is corrupt or incorrect, which makes reprogramming necessary.
- **B1233:** Control unit self-test failed → The airbag control unit could not successfully complete its internal self-test, which indicates a defect.
What part numbers are available for Toyota Corolla Hatchback airbag control unit repair?
For the repair or replacement of a Toyota Corolla Hatchback airbag control unit, only specific, 100% verified original Toyota OEM part numbers are relevant. These ensure full compatibility and functionality in the vehicle, as external suppliers such as Bosch or Continental do not primarily manufacture the control units themselves for Toyota models.
The following original OEM part numbers are verified and compatible with the Toyota Corolla (including hatchback variants) airbag control unit:
- **8917002A60:** This genuine Toyota OEM part number is explicitly confirmed for various Corolla models, including hatchback.
- **8917013060:** As the original airbag control unit, this number is specified for the Toyota Corolla and is compatible with specific model variants.
- **89170-0F032:** This genuine Toyota OEM part number is also found in Corolla Verso models, indicating broad series compatibility.
- **8917012160:** Another verified genuine Toyota OEM part number, explicitly tested for Toyota Corolla models, including Hatchback.
These part numbers refer only to the airbag control unit (SRS airbag computer) and not to sensors or other airbag modules in the vehicle.