Airbag control unit with part number 9677910980

What is the function of the airbag control unit 9677910980?

The airbag control unit with part number 9677910980 is the central control module for the passive safety system in the Citroën DS5 I. Its task is to process signals from acceleration and crash sensors and, in the event of an accident, to deploy the airbags and seatbelt pretensioners precisely and on time.

This component continuously monitors all connected system parts, such as sensors, airbag igniters, and seatbelt pretensioners. If a fault is detected, the airbag warning light in the instrument cluster illuminates to alert the driver.

The proper functioning of this control unit is critical for occupant safety, as it ensures that the restraint systems operate as intended in an emergency.

Why does control unit 9677910980 fail?

A primary reason for failure of control unit 9677910980 is stored crash data following an accident. Other causes include internal electronic defects that lead to communication errors or persistent error codes such as B1111 (control unit defective), which block the device’s functionality.

Even after a minor accident where the airbags did not deploy, the control unit may become internally locked. In this state, crash data remains permanently stored, preventing further operation and requiring replacement or professional repair.

In addition, defects can occur in the electronic components directly on the circuit board. These hardware faults often trigger an internal self-test error, recorded in the fault memory as “control unit defective” or “internal error,” activating the airbag warning light.

How do you recognize a defect in control unit 9677910980?

A defect in control unit 9677910980 primarily manifests as a constantly or intermittently illuminated airbag warning light on the dashboard. Additionally, specific codes such as B1111 (control unit defective) or general communication errors may be logged in the fault memory, indicating an internal issue.

The most noticeable symptom is the persistently lit airbag warning lamp after starting the vehicle. This is a clear indication that the system has detected a fault and may not function—or may not function correctly—in the event of an accident.

During diagnostics at a workshop, the defect often becomes apparent through the inability to communicate with the control unit. The diagnostic tool receives no response from the module, or unerasable error codes appear, pointing to an internal hardware fault or stored crash data.

In which vehicles is control unit 9677910980 installed?

The airbag control unit with part number 9677910980 was specifically developed for the French manufacturer Citroën. At Airbag24, this control unit is professionally refurbished for the first-generation Citroën DS5, including the facelift model.

At Airbag24, we repair part number 9677910980 for the following specific vehicle models:

Citroën: DS5 I (model years 2011–2015) and DS5 I Facelift (model years 2015–2019)

How does the repair of control unit 9677910980 proceed?

Repair at Airbag24 follows a standardized process. After removal and shipment of the defective control unit, technicians perform a systematic analysis, rectify the electronic fault, erase crash data if necessary, and conduct final tests to ensure full functionality.

Once the defective control unit arrives at Airbag24, it undergoes thorough diagnostics. Our mechatronics experts use specialized test benches to pinpoint the exact source of the fault on the circuit board—whether it’s a defective component or memory locked by crash data.

Subsequently, professional repairs are carried out, replacing not only the faulty components but also proactively addressing known weak points. Following successful restoration and a functional test, the control unit is prepared for return shipping. We provide 2 years' statutory liability for defects on every repair.