Airbag control unit with part number W2T80274

What does the airbag control unit W2T80274 do?

The airbag control unit W2T80274 coordinates the restraint system (SRS) of Mazda. From the signals of the crash sensors it calculates within fractions of a second, in an accident, which airbags and seatbelt pretensioners to trigger.

It also monitors the system permanently. Faults appear via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit W2T80274 fail?

The most common cause is a crash data entry stored after an accident, even if no airbag has deployed. Also possible are aged components, moisture and corrosion on plugs, cold solder joints and voltage spikes.

• Aged electronic components
• Moisture and corrosion on plug connections
• Cold solder joints
• Voltage spikes, for example from a weak battery or a jump start

Crash data cannot be erased with a normal diagnostic tool. The other causes can only be clearly identified by testing the unit.

How can you tell that the W2T80274 is defective?

A defect shows up on the airbag warning light, which lights up in the instrument cluster permanently or intermittently. Error messages and connection problems are also noticeable.

• Permanent or intermittent lighting of the airbag warning light
• Error message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

Airbags and seatbelt pretensioners may not trigger in an emergency as long as the fault persists. If you see any of these indications, have the system checked promptly.

Which vehicles is the W2T80274 fitted in?

This control unit W2T80274 is fitted in these vehicles: Mazda Mazda5 CR Facelift (2008-2010) and CR (2005-2008).

The list shows the vehicles in which this unit was installed.

• Mazda Mazda5 CR Facelift (2008-2010)
• Mazda Mazda5 CR (2005-2008)

Compare the part number on the unit with this page, and you will know you have the right unit. Only reading out the fault memory answers whether the unit itself is defective. It also shows whether a plug or a cable causes the fault, so have the fault memory read out beforehand.

How does the repair of the W2T80274 work?

First have the fault memory read out, enclose the log, and then disconnect the battery. Only then remove the control unit, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit, repairs defective components, erases the stored crash data and finally carries out a functional test. Then your own unit goes back to you.

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 W2T80274 get to Airbag24?

You send the unit yourself as a parcel, or you book a UPS collection for an extra charge. Once the repair is complete, Airbag24 sends the unit back to you via UPS.

Pack the unit shock-resistant and put the printed repair order into the parcel.