Airbag control unit with part number CG37-57K30

What does the airbag control unit CG37-57K30 do?

The airbag control unit CG37-57K30 is the central unit of the SRS restraint system of Mazda. It processes the readings from the crash sensors, decides on triggering in an accident and monitors all components permanently.

The unit stores faults in its memory and reports them via the airbag warning light. In this way, the condition of the system can be checked at any time.

After an accident, it stores crash data and locks itself. The unit thus protects the function of the system until the repair is complete.

Why does the control unit CG37-57K30 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage peaks in the vehicle electrical system.

A normal diagnostic tool cannot erase the crash data, so the fault remains in the memory. Airbag24 erases this data deliberately during the repair.

The other causes develop gradually. Solder joints become brittle over time, and moisture and corrosion attack the contacts. A weak battery or a jump start can also place a strain on the electronics.

How can you tell that the CG37-57K30 is defective?

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

• airbag warning light on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool finds no connection
• fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may possibly fail to trigger in an emergency.

Which vehicles is the CG37-57K30 fitted in?

The control unit CG37-57K30 is fitted in these vehicles: Mazda Mazda5 CW (2010-2013) and CW Facelift (2013-2018).

The following models are stored:

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

Compare the part number on the label of the removed unit with this page. This shows you that you have the right unit. The fault memory must nevertheless be read out beforehand, because only it shows whether the control unit or a cable is the cause.

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

How does the repair of the CG37-57K30 work?

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

Airbag24 tests the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days, counting only testing, repair and function test. 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 CG37-57K30 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shockproof.