Airbag control unit with part number X6T39772

What is the function of the airbag control unit X6T39772?

The airbag control unit with part number X6T39772 is the central control module for the occupant restraint system (SRS) in the Mitsubishi Colt CA (model years 1992–1996). It processes data from crash sensors and decides, within milliseconds, whether to deploy airbags and seatbelt pretensioners.

As the “brain” of the safety system, this module continuously monitors all relevant sensors and components. In the event of a collision, it analyzes incoming signals and activates the necessary restraint systems to provide optimal protection for occupants. Manufacturers such as Bosch or Denso are typical suppliers of this type of control unit.

A failure of the X6T39772 control unit results in complete deactivation of the airbag system. This is indicated to the driver by the permanently illuminated SRS warning light in the cockpit, posing a significant safety risk.

Why does the X6T39772 control unit fail?

The most common cause of failure for the X6T39772 control unit is the storage of crash data after an accident, which locks the system. Other causes include internal electronic malfunctions, incorrect processing of sensor signals, or a complete loss of communication due to hardware defects.

After an airbag deployment, the unit irrevocably stores a crash record in its internal memory. This lock is a safety feature and cannot be cleared using standard diagnostic tools at a workshop. As a result, the control unit remains disabled until professional repair is performed.

Internal electronic faults are another frequent source of problems. Aging components, cold solder joints, or voltage spikes can lead to malfunctions. For example, the module may no longer correctly interpret sensor signals or fail entirely.

In certain cases, a total system failure occurs, where the control unit stops responding to diagnostic requests. This loss of communication indicates a severe internal hardware defect.

Several equivalent part numbers are known for this module, often installed in the same vehicles. These include MR587417, 285001685, MB953174, 285001688, MR260703, X6T39473, as well as related Bosch numbers such as 0 285 001 646.

How do you recognize a fault in the X6T39772 airbag control unit?

The clearest symptom is a permanently lit or flashing SRS or airbag warning light on the instrument panel. Additional signs include non‑erasable fault codes stored in the error memory—such as B1411—or the inability to establish any communication with the control unit via diagnostic equipment.

The airbag warning light serves as the primary alert for the driver, indicating that the system has detected a critical fault and will not function properly in the event of a crash. Immediate inspection at a specialized workshop is therefore essential.

When reading the error memory, specific fault codes may point to an internal defect in the control unit. Even after attempting repairs on other system components, these codes persist because the root cause lies within the module itself.

A serious malfunction occurs when the control unit becomes unreachable to diagnostic tools. In such cases, the workshop cannot read fault codes or communicate with the module, making targeted vehicle diagnostics difficult and strongly suggesting a complete failure of the device.

In which vehicles is the X6T39772 control unit installed?

The airbag control unit with part number X6T39772 is specifically designed for Mitsubishi Colt models of the CA series produced between 1992 and 1996. Airbag24 offers expert, reliable repair services for this particular module.

At Airbag24, we repair this control unit for the following model:

Mitsubishi Colt CA (model years 1992–1996)

How is the X6T39772 control unit professionally repaired?

Professional repair at Airbag24 includes diagnosis, erasure of stored crash data, and reprogramming of the control unit to restore it to factory settings. Upon receipt, the module is thoroughly analyzed by experienced technicians and tested on specialized test benches.

Once the removed control unit arrives at Airbag24, our technicians conduct a comprehensive initial inspection to pinpoint the exact cause of the fault. The most common repair step involves carefully removing crash data from the memory chip.

Subsequently, the unit’s software is reinstalled, returning the module to its original delivery condition. If further electronic defects are identified during analysis, they are expertly repaired.

After successful repair, each control unit undergoes a final functional test to ensure flawless operation. You receive a fully functional component that can be reinstalled in your vehicle without additional coding (plug-and-play). We provide 2 years' statutory liability for defects on every repair.