Airbag control unit with part number 959104H600

What is the function of the airbag control unit 959104H600?

The airbag control unit with part number 959104H600 is the central control module of the occupant safety system (SRS) in the Hyundai Starex / H-1 of the TQ series. It processes data from crash sensors and determines whether to deploy airbags and seatbelt pretensioners, providing optimal protection for occupants in the event of a collision.

As the “brain” of the safety system, this module continuously monitors all connected components, such as front and side airbags, seatbelt pretensioners, and the vehicle’s acceleration sensors. In the event of a collision, it analyzes incoming signals within milliseconds and activates the necessary restraint systems.

A key function of the control unit is storing crash data after an accident. This information locks the system to prevent reuse without professional inspection and repair. The housing often also bears the supplier number 0285001925 or the identifier SA310720000, which refer to the same component.

Why does the airbag control unit 959104H600 fail?

The most common cause of failure for control unit 959104H600 is the storage of crash data following an accident. Other causes include internal electronic malfunctions that disrupt communication, as well as hardware damage due to overvoltage, short circuits, or moisture ingress leading to corrosion.

After a collision, a permanent error message—“Crash data stored”—is recorded in the internal memory (EEPROM/Flash). This entry cannot be cleared using standard diagnostic tools and disables the entire airbag system, indicated by the illuminated SRS warning light.

Even without an accident, internal hardware defects may occur. Error codes such as “control unit defective” or “internal error” often point to damaged electronic components like ICs, driver stages, or resistors on the circuit board. In such cases, component-level repair is required.

External factors, such as water damage from a leaking body or overvoltage caused by a faulty jump starter, can also result in severe damage to the control unit. This typically manifests as complete communication failure with the diagnostic tool.

This control unit belongs to a series where hardware and software are closely related. Therefore, defects in compatible part numbers 95910-4H500, 285001924, 95900-4A301, SA310720000, and 285001925 can often be resolved using the same repair procedure.

How do you recognize a defect in control unit 959104H600?

A defect in the airbag control unit 959104H600 usually shows up as a permanently illuminated airbag or SRS warning light on the instrument cluster. Often, the workshop can no longer communicate with the control unit via the OBD port, making accurate diagnosis challenging.

The clearest symptom is the persistently lit airbag warning light. It does not turn off after starting the engine, indicating that the entire occupant safety system is disabled and would not deploy in the event of a crash.

Another clear sign is when the diagnostic tool cannot read the fault memory or displays error codes such as “control unit defective,” “internal error,” or “crash data stored.” These messages directly point to a problem within the module itself.

Problems with connectors or wiring leading to the control unit can also produce similar symptoms. A thorough professional inspection at the workshop should always include the SRS system’s peripherals before removing the control unit for repair.

In which vehicles is control unit 959104H600 installed?

The airbag control unit 959104H600 is specifically used in the TQ series of the Hyundai Starex, known in some markets as the Hyundai H-1 or H300. At Airbag24, we cover repairs for model years roughly between 2008 and 2020, including the facelifted version.

At Airbag24, we repair this control unit for the following models and series:

Hyundai:

• Hyundai Starex TQ (circa 2008–2018)

• Hyundai H-1 TQ (circa 2008–2018)

• Hyundai H300 TQ (circa 2008–2018)

• Hyundai Starex TQ Facelift (circa 2018–2020)

How does the repair of 959104H600 proceed at Airbag24?

Repair at Airbag24 follows a standardized process: After shipment, the control unit is analyzed on a specialized test bench. Stored crash data is then erased, and any hardware defects are repaired. A final functional test ensures the module operates like new again.

Once the defective control unit has been removed from your workshop, please send it securely packaged to Airbag24. Be sure to include a detailed description of the fault along with your contact information.

Upon receipt, our technicians perform a comprehensive electronic analysis to determine whether only the crash data needs to be erased or if there are additional hardware damages on the circuit board.

The core of the repair lies in professionally resetting the crash data stored in the internal memory. If further defects—such as faulty solder joints or damaged components—are identified during the analysis, they will be expertly repaired.

Finally, the repaired control unit is tested on a simulation test bench, where communication and the correct functionality of all outputs (e.g., for airbags and seatbelt pretensioners) are verified. Only after passing this final test is the device approved for return shipment. Every repair comes with 2 years' statutory liability for defects.