Airbag control unit with part number 6546F7

What is the function of Airbag Control Unit 6546F7?

The Airbag Control Unit 6546F7 is the central control module for the occupant safety system (SRS) in vehicles such as the Peugeot 107. It analyzes sensor data in real time and determines whether to deploy airbags and seatbelt pretensioners during a crash, thereby protecting occupants.

The module with part number 6546F7, also known by alternative numbers 89170-0H050, 212388-105, 891700H010, 2123BB106, 89170-0H040, 212388104, 212388110, and 6546F6, is responsible for monitoring all relevant components of the restraint system.

This includes crash sensors, seat occupancy detectors, seatbelt pretensioners, and the airbag modules themselves. Proper functionality is critical for vehicle safety and a prerequisite for passing the main inspection (TÜV).

Why does Control Unit 6546F7 fail?

The most common cause of failure for Control Unit 6546F7 is stored crash data following an accident, which prevents further operation. In addition, internal electronic faults, short circuits, undervoltage due to a weak battery or alternator, and moisture damage can all lead to unit failure.

After a collision, the unit permanently stores crash event data. This is a manufacturer‑imposed safety measure that locks the control unit, requiring repair. Often, the vehicle’s VIN number stored in memory is also missing under these conditions.

Physical impacts—such as spilled liquids frequently reaching the control unit beneath the seats—or general water damage can cause corrosion and short circuits on the circuit board.

Internal components like capacitors or processors may also fail due to age or voltage spikes, resulting in an “internal error” recorded in the fault memory. Cable breaks in the power supply line are another potential source of failure.

How do you recognize a defect in Control Unit 6546F7?

A defective Airbag Control Unit 6546F7 almost always manifests as a continuously illuminated or flashing SRS/Airbag warning light on the instrument cluster. In many cases, communication between the diagnostic tool and the control unit via the OBD interface is also lost.

The illumination of the warning light is a clear indication that the entire restraint system has been disabled. In the event of an accident, airbags and seatbelt pretensioners will not deploy, posing a significant safety risk and requiring immediate inspection at a specialized workshop.

Another symptom is the presence of non‑erasable fault codes indicating either an “internal error” or “crash data stored.” With such an active fault, the vehicle will fail the main inspection.

In which vehicles is Control Unit 6546F7 installed?

The Airbag Control Unit with part number 6546F7 and compatible numbers such as 89170-0H050 or 6546F6 is primarily designed for the Peugeot 107. At Airbag24, we repair this control unit for all corresponding model series of this vehicle.

Repair services are offered for the following specific vehicle models and years:

Peugeot: 107 I (model years 2005–2009), 107 I 1st Facelift (model years 2009–2012), and 107 I 2nd Facelift (model years 2012–2014).

Is repairing Control Unit 6546F7 worthwhile?

Yes, repair is an economically and technically sensible alternative to purchasing a new unit. Compared to a new part, which often costs between €750 and €800, you save significantly. Moreover, the repaired unit is immediately ready for use without the need for time‑consuming reprogramming of the vehicle.

The biggest advantage lies in substantial cost savings. Instead of spending large sums on a new control unit, the original component is restored at the component level.

A repaired control unit retains its original vehicle coding, eliminating the complex and expensive process of programming a new unit at an authorized workshop. After installation and clearing the fault memory, the unit can be used right away.

Repair is also a sustainable solution, conserving valuable electronic resources and avoiding e‑waste. With 2 years' statutory liability for defects on the work performed, you take no risks.

How does the repair of Control Unit 6546F7 proceed?

Repair at Airbag24 begins with the professional removal of the control unit. Following submission, a precise diagnosis is carried out, analyzing internal faults, replacing defective components, and erasing stored crash data to restore full functionality.

First, a workshop should perform a thorough diagnosis of the vehicle, ruling out external sources of failure such as sensors, connectors, or the seat occupancy mat. The diagnostic report should be included with the removed control unit when it is sent in.

Upon receipt at Airbag24, our technicians perform a component-level analysis of the circuit board. Defective components are replaced, short circuits are repaired, and the device’s software is restored to factory settings by deactivating the crash-data lock.

Finally, the repaired control unit undergoes a comprehensive functional test. After return shipping, it can be reinstalled in your vehicle. You receive 2 years' statutory liability for defects on the repair.