Airbag control unit with part number 2310009950

What is the function of the airbag control unit 2310009950?

The airbag control unit with part number 2310009950 is the central control unit (SRS ECU) for the restraint system in the Toyota Yaris XP130. It is directly linked to compatible part numbers 89170-52350, 89170-0D010, and 89170-0D610, and is responsible for processing crash sensor data and activating the airbags and seatbelt pretensioners.

As the brain of the passive safety system, this ECU continuously monitors all connected components—from impact sensors and seat occupancy mats to the ignition circuits of individual airbags. In the event of a collision, it makes split-second decisions on which restraint devices need to be deployed to provide optimal protection for occupants.

The proper functioning of this control unit is therefore essential for vehicle safety. Repair databases explicitly list part number 2310009950 as a repairable component for the entire Toyota Yaris XP130 series, including facelift models.

Why does control unit 2310009950 fail?

The most common causes of failure for control unit 2310009950 are stored crash data following an accident and internal hardware defects on the circuit board. These faults often manifest as error codes such as B1000 (internal control unit fault) or B0118, indicating a critical hardware defect that necessitates repair.

After a collision—even minor ones—the control unit stores so‑called crash data. This is a safety feature designed to prevent reuse without professional inspection and reset. Such data cannot be cleared using standard diagnostic tools and effectively disables the entire SRS system.

Internal hardware failures are another frequent cause of malfunction. Defective components like voltage regulators, memory chips (EEPROM/Flash), or driver ICs for the ignition circuits can lead to total failure or sporadic malfunctions. Cold solder joints or corrosion on the circuit board can also disrupt communication or trigger internal errors.

It’s important to inspect the vehicle’s surroundings before removing the control unit. Faulty wiring, oxidized connectors, or issues with peripheral components such as seatbelt pretensioners can produce similar symptoms even when the control unit itself is intact. A thorough diagnosis is therefore the first step.

How do you recognize a defect in the airbag control unit?

A defect in control unit 2310009950 is primarily indicated by the airbag warning light (SRS lamp) remaining constantly illuminated on the dashboard. Another clear sign is when the control unit becomes unreachable via a diagnostic tool or displays persistent internal error codes like B1000 that cannot be cleared.

The most obvious symptom is the active SRS warning light. It fails to turn off after starting the vehicle or flashes intermittently during driving, signaling a detected safety‑critical fault within the system.

A more serious indication is a loss of communication. If a workshop cannot establish a connection between the diagnostic tester and the airbag control unit, there is often an internal hardware defect within the ECU itself.

Following an accident, storing crash data is intentional but results in an error message. The airbag light stays on, and the fault memory cannot be reset until the data has been professionally removed from the control unit.

In rarer cases, the vehicle identification number (VIN) stored in the control unit may also become corrupted or inconsistent, leading to additional error messages.

In which vehicles is control unit 2310009950 installed?

The airbag control unit with part number 2310009950 is specifically used in the third generation of the Toyota Yaris, model code XP130. At Airbag24, we successfully refurbish this control unit for the entire model range from approximately 2010 to 2020, including both facelift versions.

At Airbag24, we repair part number 2310009950 for the following specific models:

Toyota Yaris XP130 (circa 2010–2014)

Toyota Yaris XP130 First Facelift (circa 2014–2017)

Toyota Yaris XP130 Second Facelift (circa 2017–2020)

Our repair expertise also covers functionally equivalent control units with part numbers 89170-52350, 89170-0D010, and 89170-0D610, which are installed in the same vehicles.

How is control unit 2310009950 repaired?

Repair at Airbag24 begins with an initial inspection of the removed control unit on a specialized test bench. Depending on the nature of the fault, stored crash data is erased or repairs are performed at the component level. Following a final functional test, the control unit is fully operational again and returned with 2 years' statutory liability for defects.

First, a thorough diagnosis is performed in the vehicle to confirm that the fault indeed lies within control unit 2310009950. Following proper removal, the unit is sent to Airbag24 along with a diagnostic report.

Upon arrival, it undergoes analysis on a test bench, where communication and the internal fault memory are read out. The repair is then carried out. If crash data has been stored, the memory is professionally reprogrammed. For hardware defects indicated by error codes B1000 or B0118, repairs are performed at the electronic level: defective components such as memory chips, voltage regulators, or driver ICs are replaced with new parts, and solder joints are reworked.

After completion, the control unit is subjected to an extensive functional test to ensure it operates like a brand-new component. Once reinstalled in the vehicle, typically only a single clearing of the vehicle’s fault memory is required.

Important Safety Instructions for Handling

Work on the airbag system is safety-critical and must be performed exclusively by trained specialists with appropriate expertise. Using simulators or resistors to bypass circuits is life-threatening and will result in the revocation of the vehicle’s operating permit.

Improper handling can lead to unintended deployment of airbags or seatbelt pretensioners, causing serious injuries. Therefore, always entrust installation and removal to a qualified specialist workshop.

Attempts to tamper with the SRS system—such as using airbag simulators or disabling warning lights—pose significant safety risks and are illegal.