Airbag control unit with part number 001 820 22 26 [00]

What is the function of the airbag control unit 001 820 22 26 (00)?

The airbag control unit with part number 001 820 22 26 (00), manufactured by Bosch or Temic, serves as the central control module for the occupant protection system (SRS) in the Mercedes-Benz E-Class W210. It processes signals from crash sensors and determines whether to deploy airbags and seatbelt pretensioners in the event of a collision.

As the “brain” of the safety system, this module—also known under the Bosch designation 0 285 001 215—is responsible for monitoring all relevant components. It ensures that the system operates precisely and reliably in an emergency, providing optimal protection for vehicle occupants.

It is directly connected to various sensors throughout the vehicle to continuously analyze acceleration and deceleration data. This constant monitoring is crucial for detecting a collision within milliseconds and activating the necessary restraint systems.

Why does the control unit 001 820 22 26 (00) fail?

The most common cause of failure for the control unit 001 820 22 26 (00) is the storage of crash data after an accident, which results in an internal lockout of the device. Other reasons include internal electronic malfunctions due to aging, defects caused by undervoltage, or general component fatigue.

Following a collision—even minor ones—so‑called crash data is permanently stored in the control unit’s memory. For safety reasons, this lock prevents further use and must be reset through professional repair.

Internal hardware defects are another frequent source of failure. Aging electronic components or faulty solder joints can lead to complete malfunction, often indicated by error code B1000 (control unit defective). Such issues are typical for electronic components of this vehicle generation.

Insufficient power supply can also damage the module. The specific fault N2/7 (undervoltage at terminal 15R/15) points to problems in the vehicle’s electrical system that may put the airbag control unit into a permanent error state. Similar faults occur with compatible part numbers 001 820 21 26 and 001 820 10 26 as well.

How do you recognize a defect in the control unit 001 820 22 26 (00)?

A defect in the control unit 001 820 22 26 (00) primarily manifests as a constantly illuminated SRS airbag warning light on the instrument cluster. Often, communication with diagnostic equipment (e.g., Star Diagnosis) is no longer possible, and specific error codes such as B1000 can no longer be cleared.

The most obvious sign is the persistently lit airbag indicator light (SRS lamp). This light fails to turn off after starting the engine, indicating a serious, safety‑relevant system fault.

Another clear symptom is the inability to perform diagnostics. When a workshop attempts to read the fault memory, the control unit no longer responds to requests. This loss of communication often confirms an internal defect in the control module.

In addition, specific error codes remain stored in the fault memory and cannot be permanently erased. These include B1000 (control unit defective), B1315/B1316 (passenger seat occupancy detection errors), B1010, B1863, or N2/7 (undervoltage). A passenger‑side airbag OFF light that remains active can also indicate a control unit defect.

In which vehicles is the control unit 001 820 22 26 (00) installed?

The airbag control unit with part number 001 820 22 26 (00) is specifically designed for the Mercedes-Benz E-Class W210 sedan, produced between 1995 and 2002. Airbag24 offers professional repairs for this critical safety component.

At Airbag24, we repair this control unit as well as compatible variants such as 001 820 21 26, 001 820 10 26, and A001 820 23 26 for the following model:

Mercedes-Benz: E-Class Sedan (W210)

Inside the vehicle, the control unit is located centrally in the dashboard, directly beneath the ashtray and in front of the automatic gear selector. Before removal, the battery must be disconnected to prevent accidental deployment of the airbags.

How does repair work at Airbag24?

Repair of the control unit 001 820 22 26 (00) at Airbag24 includes professional clearing of crash data and fixing internal electronic defects. After submission, the unit is inspected, repaired, and subjected to a final functional test before being returned with 2 years' statutory liability for defects.

Before disassembly, it is recommended to have the fault memory read out at a specialized workshop. This ensures that the actual cause of the fault is the control unit itself, rather than an external sensor.

After removal, please send the securely packaged control unit to Airbag24. Our technicians will perform a comprehensive analysis to identify the exact cause of the fault. Subsequently, stored crash data will be erased, and any defective electronic components on the circuit board will be replaced.

Following successful repair, the control unit undergoes a final functional test to ensure all system components operate correctly. The repaired unit is immediately ready for installation (plug-and-play) and requires no additional programming. We provide 2 years' statutory liability for defects on every repair.

What are the benefits of repairing 001 820 22 26 (00)?

Repairing the control unit 001 820 22 26 (00) is an economically and technically sensible alternative to costly new purchases. You save significantly compared to a new part, which often costs between 300 and 500 euros, and receive a fully functional, tested original component with warranty.

A key advantage is substantial cost savings. Repairing is considerably cheaper than buying a new part, without compromising safety or functionality.

You get back your original control unit, tailored specifically to your vehicle. This eliminates time-consuming and expensive coding or programming procedures that would typically be required for a new or used replacement part.

Moreover, repair is a sustainable solution. Instead of discarding a complex electronic component, it is expertly refurbished, conserving resources and protecting the environment. Each repair is backed by 2 years' statutory liability for defects.