Toyota Aygo X airbag control unit repair

What is a Toyota Aygo X airbag control unit?

The Toyota Aygo X 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 in the vehicle.

As an SRS control unit, it is responsible for the precise control of front, side and head airbags as well as the seat belt pretensioners.

It processes signals from impact sensors in milliseconds in order to initiate targeted activation of the safety systems if necessary.

Why is the Toyota Aygo X airbag control unit defective?

A Toyota Aygo X airbag control unit is often defective because it stores irretrievable crash data after an accident or has an internal error that blocks communication. This causes the airbag warning light to remain permanently illuminated and the system to lose its protective function.

The error code B1000 often signals a general internal defect in the control unit.

In such cases, communication with the control unit is not possible or only possible to a limited extent, which makes a repair of the Toyota Aygo X airbag control unit necessary.

Common error codes for Toyota Aygo X airbag control unit repair

When repairing the Toyota Aygo X airbag control unit, error code B1000 is the most common indication of a defect. This code signals specific problems with the control unit itself, not with sensors or other peripheral components.

• B1000 → Control unit defective / communication error → Crash data saved after an accident or internal control unit error.

Other error codes that affect seat occupancy mats or sensors are explicitly excluded here, since B1000 refers directly to the control unit.

What part numbers are available for the Toyota Aygo X airbag control unit repair?

Several specific OEM part numbers are relevant for Toyota Aygo X airbag control unit repairs, either from Toyota itself or from reputable suppliers like TRW. It is crucial that the serial number matches your vehicle model and year of manufacture exactly.

The following verified OEM part numbers are known and can be repaired for the Toyota Aygo X airbag control unit:

• 89170-0H010 (or TRW 89831-0H010)
• 89170-0H020 / 891700H020
• 89170-0H030 / 891700H030
• 89170-0H050 / 891700H050

These numbers have been confirmed by several independent sources and cover different versions of the Toyota Aygo airbag control unit.

Function and advantages of the Toyota Aygo X airbag control unit repair

Repairing your Toyota Aygo X airbag control unit will reset the system to its original condition, erase all stored crash data, and resolve internal errors such as the B1000 code. This restores the safety system's full functionality and saves the cost of an expensive replacement.

The control unit continuously monitors all airbag modules and belt tensioners for maximum occupant safety.

After a professional repair, vehicle-specific data is retained, allowing for trouble-free recommissioning.

The control unit's diagnostic function immediately warns of errors through the airbag warning light, which enables early rectification.

Installation and safety instructions for the Toyota Aygo X airbag control unit

The installation of the Toyota Aygo X airbag control unit requires the utmost care and should only be performed by qualified specialist workshops. Safety measures such as disconnecting the battery are essential to prevent accidental activation and hazards.

The control unit is typically located in the center console, in front of the vehicle's gearshift lever.

All connectors, especially the yellow-marked airbag connectors, must be handled carefully to avoid contact errors.

After installation, it is essential to erase the error memory using a suitable diagnostic tool to ensure the correct functioning of the repaired system.