Airbag control unit with part number 985H15DC0A

What is the function of the airbag control unit 985H15DC0A?

The airbag control unit with part number 985H15DC0A is the central control module for the Supplemental Restraint System (SRS) in the Infiniti QX30 (H15). It continuously analyzes data from vehicle sensors to ensure that, in the event of a collision, airbags and seatbelt pretensioners are deployed precisely and at the right moment, thereby safeguarding occupant safety.

As the “brain” of the passive safety system, this control unit processes signals from acceleration and pressure sensors. Based on this data, it determines within milliseconds which restraint systems need to be activated. If a fault occurs, the entire SRS is deactivated for safety reasons, indicated by the airbag warning light.

Therefore, the proper functioning of the control unit is essential. If it fails, neither airbags nor seatbelt pretensioners will operate during a crash, significantly increasing the risk of injury to occupants.

Why does the control unit 985H15DC0A fail?

A failure of the 985H15DC0A control unit is most commonly caused by stored crash data following an accident, which locks the device. Other causes include internal electronic faults in components such as microcontrollers or capacitors, damage due to overvoltage or moisture, and communication errors on the CAN bus.

The most frequent cause is the storage of crash data. After an airbag deployment, the manufacturer programs the unit to self-lock as a safety measure, requiring replacement or professional repair. Simply clearing the fault memory is not sufficient.

In addition, purely electronic failures can lead to malfunction. Internal components like microcontrollers, memory chips, or capacitors may fail due to aging, overvoltage in the vehicle’s electrical system, or water ingress. Spontaneous failures without an obvious cause are also attributable to defects in these parts.

Communication failures on the CAN bus can likewise disable the control unit. If the data link to other vehicle systems is disrupted, the control unit can no longer perform its functions and reports an internal error.

How do you recognize a defect in the airbag control unit 985H15DC0A?

A defect in the 985H15DC0A control unit primarily manifests as a permanently illuminated or flashing SRS airbag warning light on the instrument panel. Additionally, the control unit often cannot be read by a diagnostic tool (no communication). Internally stored fault codes, such as 65535 or 00003, are also clear indicators.

The most obvious symptom is the active SRS warning light on the dashboard. It does not turn off after starting the engine, signaling that the entire airbag system is disabled and offers no protection.

Another common sign is complete loss of communication. The workshop cannot establish a connection with the airbag control unit using a diagnostic tool to read fault codes or perform diagnostics—the unit no longer responds to requests.

If fault codes can still be read, specific entries such as “internal error,” “control unit defective,” or numeric codes like 65535, 93F9, or 00003 (for comparable units) directly point to an irreparable internal hardware failure or locked crash data.

In which vehicles is the control unit 985H15DC0A installed?

The airbag control unit 985H15DC0A is primarily used in the Infiniti QX30 of the H15 series (model years 2016–2020). It is technically closely related to the systems found in the Infiniti Q30 (H15). Airbag24 offers professional repair services specifically for this control unit, which is installed in these models.

At Airbag24, compatibility of this control unit is ensured for the following models and series:

Infiniti QX30 (H15 series, model years 2016–2020)

Due to their technical similarity, repairs are also relevant for control units from the Infiniti Q30 (H15 series), which share a similar architecture.

How is the control unit 985H15DC0A professionally repaired?

At Airbag24, the 985H15DC0A control unit undergoes a systematic repair process. Following a thorough diagnosis, stored crash data is professionally reset, and defective electronic components—such as ICs or sensors—are replaced at the chip level. A final functional test ensures quality and is backed by 2 years’ statutory liability for defects.

After submission to Airbag24, a comprehensive analysis is first conducted. Technicians check whether crash data is stored or if there is an electronic fault in the internal components.

The actual repair involves carefully erasing crash data or replacing faulty components. This is carried out through precise soldering work on the circuit board, where defective microcontrollers, memory modules, or capacitors are replaced, for example.

Subsequently, the control unit is tested on a specialized test bench to ensure the flawless operation of all components and communication interfaces. Only after passing this test is the device approved for return shipment, accompanied by 2 years’ statutory liability for defects on the repair performed.

Is it Worth Repairing Control Unit 985H15DC0A?

Repairing the airbag control unit 985H15DC0A is a highly cost-effective alternative to an expensive new purchase. You can often save 30–50% compared to a brand-new part, which may amount to several hundred euros. Moreover, the repair is sustainable and backed by 2 years' statutory liability for defects.

A new part for the Infiniti QX30 often comes with substantial costs. Repair offers a budget-friendly solution that restores the original component’s full functionality without compromising safety.

In addition, refurbishing your existing control unit helps avoid electronic waste and conserves valuable resources. This approach is not only economical but also environmentally responsible. The 2 years’ statutory liability for defects provided by Airbag24 gives you added peace of mind.