Airbag control unit with part number 1790083

What is the function of Airbag Control Unit 1790083?

The airbag control unit with part number 1790083 is the central control module of the occupant protection system in the Ford Grand C-Max Mk2 and C-Max II (DXA). It analyzes data from crash sensors and determines whether to deploy airbags and seatbelt pretensioners, thereby protecting occupants during a collision.

Technically, this control unit is specifically designed for the second generation of the Ford C-Max (model years approximately 2010–2019). It is also known under alternative part numbers such as DM5T-14B321-SA or the Bosch number 0285011577, ensuring compatibility within this vehicle platform.

The primary task of the device is continuous monitoring of all relevant components of the restraint system. Upon impact, it processes signals from acceleration and pressure sensors within milliseconds and activates the necessary pyrotechnic charges. After deployment, the unit stores crash data, which results in the system being locked out.

Why does control unit 1790083 fail?

The most common cause of failure for control unit 1790083 is the storage of crash data following an accident. Additional faults arise from internal electronic malfunctions, moisture damage, or improper repair attempts that can harm the sensitive hardware.

After an airbag deployment, the system intentionally locks the control unit. This feature, known as “crash lock,” ensures safety by preventing further operation of a potentially compromised system. Simple erasure via diagnostic equipment is not possible here; the data must be reset at the chip level.

Hardware defects represent another major source of failure. Ingress of moisture can lead to corrosion on the circuit board and components. Additionally, age-related failures of electronic parts such as processors or memory modules can completely disable the unit’s functionality.

How do you recognize a defect in airbag control unit 1790083?

A defect in control unit 1790083 primarily manifests as a continuously illuminated airbag warning light on the instrument cluster. Often, communication with the control unit via diagnostic equipment becomes impossible, and the onboard computer displays an “airbag internal error.”

The clearest symptom is the persistently lit airbag warning light. It does not extinguish after starting the vehicle, indicating a serious stored fault in the system that compromises the entire occupant protection system.

A critical sign for workshops is complete loss of communication. When attempting to read the control unit with diagnostic tools, no response is received—strongly suggesting an internal defect rather than a problem with sensors or wiring.

Additional indicators include specific error messages on the display pointing to a fault in the airbag system. In some cases, unusual flickering of the speedometer illumination or the warning light when locking the vehicle has also been observed.

In which vehicles is control unit 1790083 installed?

Part number 1790083 is specifically designed for second-generation Ford C-Max models. It is found in the Ford Grand C-Max Mk2 as well as the C-Max II (DXA), including facelifted versions produced over a broad model range.

At Airbag24, we repair part number 1790083 for the following Ford models:

Ford Grand C-Max 2 (model years 2010–2015)

Ford Grand C-Max 2 Facelift (model years 2015–2019)

How is control unit 1790083 repaired?

Repair involves professional component-level restoration. After submitting the removed control unit, Airbag24 analyzes it, clears crash data, replaces defective hardware, and reprograms the software. The unit is then tested and returned ready for installation.

Before removal, a thorough diagnosis at a specialized workshop is essential to rule out wiring or sensor issues. The control unit should subsequently be securely packaged and sent along with a detailed fault description and, ideally, a diagnostic report.

At Airbag24, an in-depth analysis of the circuit board is performed. Technicians erase persistent crash data directly from the memory chip, repair hardware damage by replacing faulty components, and reprogram the software to restore the unit to like-new condition. All repairs come with 2 years' statutory liability for defects.

A key advantage of repair is that no additional coding or programming is required on the vehicle after installation. The refurbished control unit is immediately fully functional and perfectly matched to the vehicle.

Is it worth repairing 1790083?

Yes, repair is the most economically and technically sensible solution. It’s significantly cheaper than a new part, which often costs over 500 euros, and avoids the risks associated with used control units that come without a warranty. Moreover, it’s a sustainable alternative that helps conserve resources.

Compared to buying a new unit, you’ll save considerably. A new control unit also typically requires time-consuming coding in the vehicle, incurring additional workshop fees. Repair returns a plug-and-play component.

Unlike used parts, repair offers critical reliability. Used units from dismantlers may still contain locked crash data or hidden defects and are sold without any warranty. Professional refurbishment with 2 years' statutory liability for defects eliminates these risks.