Airbag control unit with part number C513-57K30B

What does the airbag control unit C513-57K30B do?

The airbag control unit C513-57K30B controls the restraint system (SRS) for Mazda. It processes the signals from the crash sensors, decides in an accident on triggering the airbags and seatbelt pretensioners, and monitors the system continuously.

If it detects a fault, it stores the fault and reports it via the airbag warning light in the instrument cluster.

After an accident, it records crash data and locks itself.

Why does the control unit C513-57K30B fail?

The most common cause with C513-57K30B is crash data stored after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

This crash data remains in the unit until it is removed. An ordinary diagnostic tool does not erase it. Airbag24 removes it during the repair.

Voltage spikes arise, for example, from a weak battery or a jump start and strain the electronics.

How can you tell that the C513-57K30B is defective?

A defect on the C513-57K30B shows as the airbag warning light, error messages in the instrument cluster and a failed diagnosis. The fault memory cannot then be cleared.

• airbag warning light, lit continuously or intermittently
• error message in the instrument cluster
• diagnostic tool without connection to the control unit
• fault memory that cannot be cleared

In an emergency, airbags and seatbelt pretensioners may fail to deploy if the control unit is defective.

React promptly: the warning light makes the fault visible, and you should not leave the indication unattended.

Which vehicles is the C513-57K30B fitted in?

The control unit C513-57K30B is fitted in these vehicles: Mazda Mazda5 CW (2010-2013) and CW Facelift (2013-2018). A glance at the label of the removed unit lets you check whether the part number matches.

The affected models at a glance:

• Mazda Mazda5 CW (2010-2013)
• Mazda Mazda5 CW Facelift (2013-2018)

Having the fault memory read out is the most important step before removal: it shows whether the control unit is faulty or whether a plug or cable is the cause. The label serves only to confirm the correct unit.

For the same vehicles, we also repair control units with the part numbers 285010636, 6300022037AA, C513-57-K30A.

How does the repair of the C513-57K30B work?

At Airbag24, testing, repair and function test of the C513-57K30B generally take 3–4 working days. First, have the fault memory read out and disconnect the battery, then remove the unit; afterwards create the repair order online and send it in.

Airbag24 checks the unit, repairs defective components, clears stored crash data and tests the function. You then receive your own unit back.

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 C513-57K30B get to Airbag24?

You send the control unit C513-57K30B as a parcel, or book UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

Pack the unit shockproof and enclose the printed repair order.