Airbag control unit with part number 212388110

What is the function of the airbag control unit 212388110?

The airbag control unit 212388110 is the central control module (SRS ECU) of the restraint system in the Peugeot 107. Its primary task is to process signals from crash sensors, ensuring that airbags and seatbelt pretensioners are deployed precisely and reliably in the event of a collision.

As the “brain” of the passive safety system, this module decides within milliseconds whether to activate the relevant protective mechanisms. It continuously monitors all connected sensors, airbag modules, and seatbelt pretensioners to ensure the system remains fully operational at all times.

The part number 212388110 refers to an electronic module manufactured by companies such as Toyota. It is technically equivalent to OEM part numbers 89170-0H050 and 89170-0H010, which are also installed in the Peugeot 107.

Why does the control unit 212388110 fail?

The most common causes of failure are internal electronic malfunctions, often triggered spontaneously by short circuits, undervoltage, or moisture damage. Another major cause is stored crash data following an accident, which locks the unit and cannot be cleared via the OBD2 interface.

Many faults occur independently of any accident. Common external factors include a defective battery or alternator leading to undervoltage, cable breaks in the vehicle wiring harness, or moisture ingress—such as from drinks spilled under the seats.

After a crash, crash data is permanently stored in the control unit’s memory. This lock typically cannot be removed using standard diagnostic tools, even if the vehicle appears undamaged externally, leaving the entire airbag system inactive.

Other typical symptoms include loss of communication with the control unit or disappearance of the programmed vehicle identification number from memory. These issues point to defects in internal hardware components like processors or memory chips. Similar problems can also arise with interchangeable part numbers such as 89170-0H050, 212388-105, or 6546F7.

How do you recognize a fault in the 212388110?

A typical fault in the 212388110 control unit manifests as a constantly or intermittently illuminated airbag warning light (SRS lamp). Communication with diagnostic equipment is often impossible, and error codes such as B1000, B0100, or “internal error” are recorded.

The most obvious sign is the activated airbag indicator light on the instrument panel. It fails to turn off after starting the engine or suddenly illuminates during driving, indicating a system‑critical fault.

During workshop diagnostics, the control unit often cannot be read; it does not respond to requests from the diagnostic tool. If communication is possible, error codes like B1000, B0100, or a general internal control unit error are typically displayed.

In rarer cases, unusual side effects may appear—for example, the speedometer illumination activating automatically when the vehicle is locked. Such symptoms suggest serious internal electronics issues.

Important safety note: Using airbag simulators or resistors to disable the warning light is both life‑threatening and illegal. When the airbag system fails, it becomes completely inoperative, resulting in a significant defect during the mandatory technical inspection (TÜV).

In which models is the 212388110 installed?

The airbag control unit with part number 212388110 is specifically designed for the Peugeot 107 and is used across all model years from 2005 to 2014. This includes both the original model and its two subsequent facelift versions.

At Airbag24, we repair the 212388110 control unit for the following models and series:

Peugeot 107 I (model years 2005–2009)

Peugeot 107 I 1st Facelift (model years 2009–2012)

Peugeot 107 I 2nd Facelift (model years 2012–2014)

How is the 212388110 control unit professionally repaired?

Professional repair at Airbag24 begins with a detailed analysis of the electronics. Stored crash data is then erased, and defective components such as processors or capacitors on the circuit board are replaced. A final test ensures full functionality of the unit.

Upon submission to Airbag24, the control unit undergoes an initial inspection to verify reported faults. Our technicians analyze the hardware and pinpoint the exact cause of the issue—whether it’s a memory blockage caused by crash data or a defect in electronic components.

The repair includes safely erasing the crash data, even when OBD communication is no longer possible, as well as replacing defective components. The control unit is then tested on a diagnostic bench to ensure it functions perfectly again.

Repair is a cost-effective alternative to expensive new purchases, which can cost up to 800 euros. A repaired unit restores the full safety and functionality of the airbag system and is essential for passing the main vehicle inspection. We offer 2 years' statutory liability for defects on all repairs.