Airbag control unit with part number W2T67571

What does the airbag control unit W2T67571 do?

For Mitsubishi, the airbag control unit W2T67571 controls the restraint system (SRS). It reads the crash sensors, determines in a crash within milliseconds which airbags and seatbelt pretensioners fire, and monitors the system continuously. After an accident it stores crash data and locks itself.

A fault it detects is reported via the airbag warning light.

It has nothing to do with driving dynamics or engine management. It is solely responsible for occupant protection.

Why does the control unit W2T67571 fail?

Most often the cause is crash data: they stay stored after an accident, even if no airbag fired, and a standard diagnostic tool cannot erase them. Further causes are aged electronics, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes such as those from a weak battery or a jump start.

The crash data relate to an event that did not necessarily mean a deployment.

Aged electronics, cold solder joints and moisture belong to the general causes that are conceivable for every control unit.

Voltage spikes, for example from a weak battery or a jump start, additionally stress the electronics.

How can you tell that the W2T67571 is defective?

An airbag warning light that stays on permanently or lights up intermittently in the instrument cluster is the clearest sign. In addition there are fault messages in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then not fire.

If the light stays on after the ignition is switched on, a fault is usually stored.

A diagnostic tool that cannot reach the control unit is a finding too. Then arrange a check promptly.

Which vehicles is the W2T67571 fitted in?

The unit with the number W2T67571 is fitted in these vehicles: Mitsubishi i-MiEV HA3W (2009-2020).

The vehicles from our assignment are listed below:

• Mitsubishi i-MiEV HA3W (2009-2020)

Comparing the number on the label of the removed unit with this page confirms that it is the right unit, nothing more. Whether the control unit itself is defective or a plug or cable is responsible is answered only by the fault memory read out. So have it read before removal.

For the same vehicles, we also repair control units with the part numbers 8635A387.

How does the repair of the W2T67571 work?

First have the fault memory read out and attach the log. Then disconnect the battery, and only then remove the control unit. Now create the repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data are erased and a function test is carried out. Processing usually takes 3–4 working days at Airbag24. After that your unit comes back to you.

The sequence of removal serves safety and is therefore mandatory.

Our repairs come with 2 years' statutory liability for defects.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit W2T67571 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 returns it to you by UPS after the repair.

The printed repair order belongs in the parcel, along with shock-proof packaging for the control unit.