Airbag control unit with part number A 003 820 73 10

What is the function of Airbag Control Unit 38207310?

The airbag control unit with part number 38207310 (alternatively 0038207310) is the central control module for the Supplemental Restraint System (SRS) in the Mercedes-Benz S-Class W126. Its primary task is to process sensor data to ensure the driver’s airbag deploys promptly and reliably in the event of a crash.

As the brain of the passive safety system, this module continuously monitors all connected components. It is specifically designed for the S-Class W126 sedan (model years 1979–1991) and installed in the center console behind the ashtray. Proper functionality is critical for occupant safety.

Why does control unit 38207310 fail?

Failures of control unit 38207310 are typically due to age-related hardware defects. Common causes include cold solder joints on the circuit board, which develop over time from thermal stress and vibrations, as well as faulty memory chips that lose their data or become unresponsive.

These purely electronic issues disrupt the device’s internal self-tests and inevitably trigger the warning light. Another potential source of failure arises with used replacement units: if the data is merely cloned instead of professionally reprogrammed, incorrect programming data from the donor vehicle may be carried over, preventing proper operation.

How do you recognize a defect in 38207310?

The most obvious symptom of a fault in airbag control unit 38207310 is the permanently illuminated airbag warning light (SRS light) in the instrument cluster. This indicates that the system has detected an internal error and cannot function properly in an emergency, posing a significant safety risk.

The light remains on after starting the vehicle and cannot be reset via the onboard diagnostic system. Attempts to access the control unit using a diagnostic tool may also fail, as an internal hardware defect often blocks external communication as well.

In which models is 38207310 installed?

The airbag control unit with part number 38207310 is specifically designed for the classic Mercedes-Benz S-Class of the W126 series. Compatibility is exclusive to this vehicle type, making repair of the original part highly recommended to avoid further issues.

At Airbag24, we repair control unit 38207310 for the following vehicle:

Mercedes-Benz: S-Class W126 Sedan (1979–1991)

What are the advantages of repair versus replacement?

Repairing the original control unit 38207310 is the technically and economically best solution. It is significantly cheaper than a new part, which often costs over €1,500 and may no longer be available. Additionally, there is no need for time-consuming reprogramming, as the vehicle-specific coding is preserved.

A repaired original unit functions immediately upon reinstallation—plug-and-play. In contrast, a used replacement part must always be reprogrammed; otherwise, it will not work in the vehicle. Simple cloning also carries the risk of inheriting hidden defects from the donor vehicle. Therefore, professional repair is the safest and most sustainable option.

How does repair at Airbag24 work?

After sending the removed control unit 38207310 to Airbag24, a professional diagnosis is first performed to precisely identify the hardware defect. Faulty components such as memory chips or solder joints are then expertly repaired or replaced according to factory specifications.

Following successful repair, the module undergoes a comprehensive final inspection to ensure proper functionality across all system areas. The unit is returned ready for installation and can be reassembled in the vehicle without additional coding or learning procedures. We provide 2 years' statutory liability for defects on all repairs.