Airbag control unit with part number EH14-57K30-K

What does the airbag control unit EH14-57K30-K do?

The airbag control unit EH14-57K30-K coordinates the restraint system (SRS) in Mazda vehicles. It evaluates the crash sensors and determines in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During operation, it checks all components of the system. If it detects a deviation, it stores it in memory and indicates it via the airbag warning light.

After an accident, it records crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit EH14-57K30-K fail?

The most common cause is crash data stored after an accident, even without a triggered airbag. Other causes in brief:

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

Crash data cannot be erased with a normal diagnostic tool. Airbag24 removes it as part of the repair, before the unit is tested.

How can you tell that the EH14-57K30-K is defective?

A defect shows up as the airbag warning light staying on permanently or intermittently, an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

• Airbag warning light stays on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool gets no connection to the control unit
• Fault memory cannot be cleared

If you notice these signs, have the system checked promptly. In an emergency, airbags and seatbelt pretensioners may not be triggered.

Which vehicles is the EH14-57K30-K fitted in?

The EH14-57K30-K is fitted in these vehicles: Mazda CX-7 ER (2006-2009) and ER Facelift (2009-2012).

The following overview shows the vehicles assigned to this part number:

• Mazda CX-7 ER (2006-2009)
• Mazda CX-7 ER Facelift (2009-2012)

Two steps will give you certainty. Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Have the fault memory read out in advance, because only that shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 0J14A3906642, 9H05A3906641.

How does the repair of the EH14-57K30-K work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. At Airbag24, testing, repair and function testing usually take 3–4 working days.

Airbag24 tests the unit on the test bench and replaces defective components. Stored crash data is erased, followed by the function test. You then receive your own unit back.

The sequence protects you: disconnecting the battery always comes before removal.

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 EH14-57K30-K get to Airbag24?

You send the unit as a parcel or, for an extra charge, book a UPS collection. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order and pack the control unit shock-proof, so that it arrives safely.