Airbag control unit with part number A1679004507

What is the function of the airbag control unit A1679004507?

The airbag control unit A1679004507 is the central control module for the entire occupant safety system (SRS) in the Mercedes-Benz GLE-Class of the V167 and C167 series. It processes signals from crash sensors, controls the deployment of airbags and seatbelt pretensioners, and stores relevant crash data after an accident.

Technically, this module is also referred to as the SRS Airbag Control Module or Restraint Control Module. It is an original OEM component that serves as the “brain” of the passive safety system, making split-second decisions on whether to activate the restraint systems.

In addition to controlling airbags and seatbelt pretensioners, the device continuously monitors all connected components, such as seat occupancy mats, seatbelt buckle sensors, and the vehicle’s impact sensors. It is specifically coded to the vehicle identification number (VIN) to ensure proper operation in each specific vehicle.

Why does the control unit A1679004507 fail?

The most common cause of failure for the control unit A1679004507 is the storage of crash data after a collision, which locks the module. Other causes include internal hardware faults on the circuit board, damage caused by moisture ingress, or harm resulting from improper repair attempts.

After an accident in which airbags or seatbelt pretensioners have deployed, the control unit irrevocably writes crash data into its internal memory. This lockout is a manufacturer‑imposed safety feature designed to prevent reusing a potentially damaged unit without professional inspection and reset.

Internal malfunctions can also lead to failure. These involve defects in electronic components such as processors or memory chips. Communication issues—where the unit becomes unreachable by diagnostic tools—often indicate such an internal fault.

It is important to note that compatibility is critical. Although similar part numbers exist, such as A1679004423, exact matching of the original part number must always be ensured to avoid malfunctions.

How do you recognize a defect in the A1679004507?

A defect in the A1679004507 control unit typically manifests as a permanently illuminated or intermittently flashing airbag warning light on the instrument cluster. Additional signs include the inability to clear fault codes, loss of communication with diagnostic equipment, and specific error messages displayed on the screen.

The most obvious symptom is the active airbag warning light, which may either remain constantly lit or briefly illuminate—for example, for about 30 seconds after starting the engine—and then stay on. This indicates a system‑critical fault within the restraint system.

Often, the control unit can no longer be accessed using a diagnostic tool, or error codes such as “Internal Error” or “Crash Data Stored,” which cannot be cleared, appear on the display.

In some cases, unusual accompanying symptoms may also occur, including messages like “Fuel Shutoff Valve” on the display, faulty speedometer illumination, or locked seatbelts that fail to release after a collision.

In which vehicles is the A1679004507 installed?

The airbag control unit with part number A1679004507 is primarily used in the Mercedes-Benz GLE class of the V167 series (SUV) and C167 series (coupe), starting from model year 2018. At Airbag24, we repair this control unit for all applicable GLE models, such as the GLE 300 d 4MATIC.

Our specialization in these models ensures deep expertise regarding the specific architecture and the most common failure patterns of this control unit variant. Our repairs cover the entire vehicle lineup:

Mercedes-Benz: GLE class (V167, from model year 2018), GLE Coupe (C167, from model year 2019)

Is it worth repairing the A1679004507 control unit?

Repairing the A1679004507 is an economically and technically sensible alternative to costly new replacement. It saves between 700 and 800 euros compared to purchasing a new unit, preserves the vehicle’s original VIN coding, and comes with 2 years' statutory liability for defects.

A new control unit is often very expensive. Used parts, which market analyses suggest can range from 100 to 250 euros, carry the risk of also having stored crash data or being incompletely compatible, potentially requiring time‑consuming reprogramming at the dealership.

By repairing the original unit, this programming effort is eliminated. After refurbishment, the control unit is fully functional again and ready for installation (plug-and-play), as the vehicle‑specific configuration remains intact.

How does the repair process work at Airbag24?

After removing and shipping the control unit to Airbag24, a comprehensive diagnosis is performed. Subsequently, the stored crash data is professionally erased, and, if necessary, defective components are replaced. Following successful final testing, the refurbished unit is returned with 2 years' statutory liability for defects.

The repair process begins with safely removing the control unit from the vehicle. It’s important to disconnect the battery beforehand. The module is often located in the center console area, beneath the ashtray or behind a trim panel.

Upon receipt, Airbag24 conducts a detailed analysis on specialized test benches. The focus is on clearing the immobilization caused by crash data and verifying all relevant hardware components.

After successful refurbishment and calibration, the control unit is prepared for reinstallation. It is crucial that, prior to installing the repaired module, all other SRS components—such as airbags, seatbelt pretensioners, and sensors—are correctly mounted and connected.