Airbag control unit with part number UR7957K30

What does the airbag control unit UR7957K30 do?

The airbag control unit UR7957K30 controls the restraint system of Mazda. It evaluates the crash sensors, decides within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered, and monitors the system constantly. After an accident it stores crash data and locks itself.

The monitoring covers all components of the system. If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster.

In this way the driver learns that something in the system is wrong, without having to connect a diagnostic tool.

Why does the control unit UR7957K30 fail?

Most often the cause lies in crash data from an accident, even if no airbag has deployed. Ageing components, cold solder joints, moisture and corrosion, and voltage spikes are also possible causes.

Standard diagnostic tools cannot erase the crash data. Airbag24 takes care of the erasure during the repair.

• ageing electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or a jump start

The bench test establishes which cause applies in the individual case.

How can you tell that the UR7957K30 is defective?

The airbag warning light in the instrument cluster, which lights up constantly or only occasionally, indicates a defect in the UR7957K30. A fault message there, a missing connection to the diagnostic tool or a fault memory that cannot be cleared are added signs. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The unit reports its findings itself via this warning light, so you do not have to search for them.

Have the finding checked promptly, because a check can establish what lies behind it.

Which vehicles is the UR7957K30 fitted in?

The control unit UR7957K30 belongs to the units used in vehicles of Mazda. It is fitted in these vehicles: Mazda BT-50 J97M (2006-2008) and J97M Facelift (2008-2012).

The overview of the vehicles:

• Mazda BT-50 J97M (2006-2008)
• Mazda BT-50 J97M Facelift (2008-2012)

Comparing the part number on the label of the removed unit with this page only ensures that you have the correct unit. Whether the control unit itself is defective or whether a connector or cable is the cause is shown only by the fault memory, which you should have read out beforehand.

For the same vehicles, we also repair control units with the part numbers UR56-57-K30B, UR79-57K30-B.

How does the repair of the UR7957K30 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days, and this time covers only the checking, repairing and testing at Airbag24.

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 UR7957K30 get to Airbag24?

You hand in the unit as a parcel or book a UPS collection for an extra charge. Airbag24 sends the repaired unit back to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.