What is a Toyota Belta XP90 airbag control unit?
The Toyota Belta XP90 airbag control unit is the central safety unit in your vehicle, responsible for detecting collisions and precisely triggering all passive occupant protection systems. It continuously monitors sensor data, stores important crash information, and ensures the operational readiness of airbags and seatbelt pretensioners to provide maximum safety.
As the electronic safety module of the Toyota Yaris XP90 (and the identical Yaris II XP90), it is the heart of the SRS system. It processes signals from impact sensors and decides on the necessary protective measures in milliseconds. This control unit is crucial for your safety after an accident.
The module communicates with other vehicle systems via the CAN bus. It continuously performs self-diagnostics to check system integrity and detect potential errors early.
Why is the Toyota Belta XP90 airbag control unit defective?
The Toyota Belta XP90 airbag control unit often becomes unusable due to stored crash data after an accident, internal hardware defects, or sudden voltage spikes. This causes the airbag warning light to remain permanently illuminated and the system to no longer function in an emergency, requiring immediate repair.
A common cause is the storage of crash data after an impact, even in minor accidents. This data blocks the control unit and must be removed by a professional Toyota Belta XP90 airbag control unit repairer.
Internal errors such as defective components or damaged memory chips are also common causes of failure. Voltage problems in the vehicle electrical system can also permanently damage the module and require a workshop diagnosis.
A faulty airbag control unit means that the safety systems will no longer function reliably in the event of a subsequent collision. Therefore, prompt diagnosis and repair of the defect is essential.
Common error codes for Toyota Belta XP90 airbag control unit repair
During Toyota Belta XP90 airbag control unit repairs, specific B-codes occur that directly indicate internal problems with the control unit. These error codes indicate communication errors, circuit problems, or defects in the module's memory, but not problems with external sensors.
- B1000 → Control unit communication error → The airbag control unit cannot send or receive any data or can send or receive incorrect data.
- B1811 → Driver Squib Dual-Stage 2nd Circuit Fault → Problem in the driver airbag ignition circuit, often directly at the control module.
- B1831 → Airbag control unit circuit fault → There is a general fault in the internal circuit of the airbag module.
- B1836 → Airbag control unit memory error → Data in the internal memory of the control unit is faulty or damaged.
- B1841 → Airbag control unit internal errors → An unspecified internal functional error of the module has occurred.
- B1861 → Airbag control unit monitoring error → The control unit cannot correctly monitor its own system functions.
- B1901 → Airbag control unit initialization error → The module could not be initialized correctly after starting the vehicle.
- B1906 → Airbag control unit voltage error → A supply voltage that is too high or too low was detected at the control unit.
These error codes are generated directly in the control unit and require a targeted diagnosis using an OBD-II scanner with SRS functionality. A professional diagnosis is the first step toward a successful Toyota Belta XP90 airbag control unit repair.
Error codes often remain in the memory even after the cause has been eliminated. A reset of the airbag control unit is then necessary to clear the warning light and fully reactivate the system.
What part numbers are available for the Toyota Belta XP90 airbag control unit repair?
For Toyota Belta XP90 airbag control unit repairs, several specific OEM part numbers are relevant to ensure exact compatibility. These numbers, such as 89170-0D440 or 89170-B1150, help identify the correct replacement part or find a suitable reset service, preventing mismatches.
Verified OEM part numbers include 89170-0D440, 89170-0D220, and 89170-0D170, often from manufacturers like TRW. The Toyota original part number 89170-B1150 is also relevant for this model.
These numbers are crucial to ensuring that the replacement part or reset service is a perfect fit for your Toyota Belta XP90 or Yaris II XP90. Avoiding incompatible parts is of utmost importance for safety during airbag control unit repair.
In addition to the OEM numbers, there are also manufacturer-specific numbers such as 220749-101 or 212986-104, which also indicate the compatibility of the control unit. Always ensure that the part number matches exactly when purchasing.