Airbag control unit with part number SA310720000

What is the function of the SA310720000 airbag control unit?

The SA310720000 airbag control unit is the central control module for the occupant protection system in the Hyundai Starex TQ. It continuously analyzes data from acceleration and collision sensors to instantly deploy airbags and seatbelt pretensioners in the event of a crash, thereby ensuring the safety of vehicle occupants.

This component serves as the brain of the Supplemental Restraint System (SRS). Its primary task is to monitor all connected sensors and activate the restraint systems at precisely the right moment. Upon impact, the control unit determines within milliseconds which airbags and seatbelt pretensioners need to be triggered.

The unit is also compatible with other OEM part numbers such as 95910-4H500, 959104H600, 95900-4A301, 285001924, and 285001925. It is typically located in a protected position inside the vehicle, such as under the center console or one of the front seats, to safeguard it from damage.

Why does the SA310720000 control unit fail?

Failures of the SA310720000 control unit are usually caused by external factors or internal component aging. The most common cause is the storage of crash data after an accident, which locks the device. Other reasons include water damage, overvoltage in the vehicle’s electrical system, or electronic malfunctions due to defective components.

After a collision, the unit permanently stores crash data. This is a safety feature that locks the system to prevent malfunction following an accident. Such a lock can only be released through specialized repair procedures.

Electronic malfunctions and hardware defects are another frequent source of failure. Individual components on the circuit board—such as capacitors, the microcontroller, or internal sensors—may fail. A technical analysis using instruments like an oscilloscope can reveal these defects.

External influences, such as water ingress or overvoltage from faulty jump-starts, can irreparably damage the control unit’s sensitive electronics, leading to total failure.

How do you recognize a fault in the SA310720000?

A defect in the SA310720000 control unit primarily manifests as the SRS airbag warning light remaining constantly illuminated or flashing on the instrument panel. Often, communication with the control unit via a diagnostic tool becomes impossible, or specific error codes such as 65535 or B1000 are stored.

The active SRS warning light is the clearest indication. It signals that the entire airbag system is disabled and will not provide any protective function in the event of a crash. Immediate inspection at a qualified workshop is therefore essential.

Another clear symptom is the lack of communication with the control unit. When a workshop attempts to read the fault memory, the diagnostic tool receives no response from the airbag control unit—the device is effectively “offline.”

In addition, specific error codes may be recorded in the fault memory, directly pointing to an internal defect. Common codes include 65535 (control unit defective), B1000, 93F9, or general CAN-bus errors indicating a disruption in the unit’s internal communication.

In which vehicles is the SA310720000 installed?

The airbag control unit with part number SA310720000 is specifically used in the Hyundai Starex TQ series. At Airbag24, we repair this control unit for the specific model generations that utilize this component, particularly those equipped with the 2.5 CRDi engine.

Repair services for this particular control unit are offered at Airbag24 for the following models and series:

- Hyundai Starex TQ (model years 2008–2018)

- Hyundai Starex TQ Facelift (model years 2018–2020)

The vehicle is also known under the names Hyundai H-1 TQ or H300. The control unit is likewise employed in these variants.

How is the SA310720000 professionally repaired?

At Airbag24, repairing the SA310720000 follows a systematic process. Upon receipt, the unit undergoes a thorough electronic analysis to identify the root cause of the fault. Defective components are then replaced, crash data is erased, and a complete functional test is performed.

Once the removed control unit arrives at Airbag24, a comprehensive diagnosis begins. Our technicians inspect the circuit board for visible damage and conduct electronic measurements to pinpoint the exact source of the problem—whether it’s a faulty component or a software issue caused by crash data.

The core of the repair lies in eliminating the underlying cause. Stored crash data is completely and securely erased. Defective electronic components, such as capacitors or microcontrollers, are replaced with new, high-quality parts. This process restores the original functionality.

Subsequently, each repaired control unit undergoes a rigorous functional test on a test bench that simulates real‑world vehicle operation. Only when all tests are successfully passed is the unit approved for return shipment. We provide 2 years' statutory liability for defects on every repair.