Airbag control unit with part number A 001 820 08 26 (08)

What is the function of Airbag Control Unit 001 820 08 26 (08)?

The component with part number 001 820 08 26 (08) is the central airbag control unit (SRS module), primarily installed in the first-generation Chrysler Crossfire (ZH series, 2003–2007). As the core of the passive safety system, it processes signals from crash sensors and deploys airbags and seatbelt pretensioners in the event of a collision.

This control unit is responsible for monitoring and managing the entire restraint system. Since the Chrysler Crossfire is based on Mercedes-Benz technology, the module shares technical similarities with systems used in Mercedes-Benz vehicles. Its role is to continuously check all system components and, in the event of a crash, activate the appropriate restraint devices within milliseconds.

Why does control unit 001 820 08 26 (08) fail?

Failures in control unit 001 820 08 26 (08) often arise from stored crash data after an accident that cannot be erased using conventional diagnostic tools. Other common causes include internal failures of electronic components resulting from moisture, heat, or age-related wear.

Following a collision, the control unit is frequently internally locked to prevent unintended deployment. This lockout is a hardware-level process that can only be resolved through specialized reprogramming. Error codes such as “internal error” or “component failure” typically indicate a defect on the circuit board, for example, in memory chips or processors.

It’s important to note that these are physical defects, not purely software issues. Similar technical architectures and fault patterns can also be found in related part numbers like Bosch’s 001 820 22 26, which is used in Mercedes-Benz models such as the W124 or W220.

How do you recognize a defect in control unit 001 820 08 26 (08)?

The most obvious symptom of a defect in control unit 001 820 08 26 (08) is a permanently or intermittently illuminated airbag warning light (SRS lamp) on the instrument cluster. Often, diagnostic tools can read entries in the fault memory such as “internal error,” “component failure,” or non-erasable crash data.

In many cases, communication between the diagnostic tool and the airbag control unit becomes impossible. The workshop can then neither read fault codes nor attempt to erase them, which is a clear indication of a severe internal malfunction.

Other, less frequent symptoms may include a flashing engine check light, error messages related to the fuel shut-off valve, or complete failure of the control unit when heated. After an accident, specific errors involving seatbelt pretensioners or deployed airbags (e.g., knee airbags) are also typical.

In which vehicles is control unit 001 820 08 26 (08) installed?

The airbag control unit with part number 001 820 08 26 (08) is mainly used in the Chrysler Crossfire. At Airbag24, we repair this module for all first-generation models produced between 2003 and 2007, including the SRT‑6 variants.

The affected vehicles specifically include:

Chrysler Crossfire (1st generation, ZH series, 2003–2007)

Due to its technical similarity to Mercedes-Benz, similar control units with different part numbers—such as 001 820 22 26—can also be found in various Mercedes-Benz models, including the E-Class (W124) or S-Class (W220).

How does Airbag24 repair the control unit?

After sending the removed control unit to Airbag24, our technicians perform a thorough analysis to identify the root cause of the fault. Professional repair includes erasing crash data, reprogramming the memory, and replacing defective components. Each unit undergoes a final inspection and is returned with 2 years' statutory liability for defects.

The process ideally begins with a diagnosis at a specialized workshop to rule out external sources of failure, such as faulty sensors or wiring harnesses. Once removed, the control unit is securely packaged and sent to us along with a repair form. Our specialists then conduct an in-depth electronic examination down to the component level.

Depending on the findings, stored crash data is cleared, defective microchips or other components are replaced, and the device’s software is restored to factory settings. This ensures that, after installation, the control unit is fully functional again without requiring an expensive new purchase.

What are the benefits of repair?

Repair is the most economical and sustainable solution. You can save up to 70% compared to purchasing a costly new part directly from the manufacturer. Since the vehicle-specific original coding is preserved, no re-learning or programming is required at the workshop after installation. Additionally, Airbag24 provides 2 years' statutory liability for defects on the work performed.

While new parts can cost anywhere from 50 to over 230 euros depending on the manufacturer, repair is significantly more affordable. Even used control units available on the market for 30 to 90 euros often aren’t a reliable alternative, as they typically need to be adapted to your vehicle and their history remains unknown. Therefore, refurbishing your original part is the safest and simplest solution.