Airbag control unit with part number NA1J-57K30

What does the airbag control unit NA1J-57K30 do?

The airbag control unit NA1J-57K30 forms the central control unit of the restraint system (SRS) for Abarth. It checks the crash sensors, determines in a collision which airbags and seatbelt pretensioners are triggered, and monitors the system constantly.

It reports faults via the airbag warning light. After an accident it stores crash data and locks itself.

Monitoring runs continuously, even when the vehicle is parked.

Why does the control unit NA1J-57K30 fail?

Stored crash data from an accident are the most common cause on the NA1J-57K30, even if no airbag was triggered; a normal diagnostic tool cannot erase them. Aged components, cold solder joints, moisture and voltage spikes are also possible causes.

The crash data memory is the most obvious reason when the unit no longer responds properly. The data remain there until Airbag24 erases them during the repair.

Apart from that, aged electronic components, solder joints that can go cold, and moisture or corrosion at the plug connections count. Voltage spikes from a weak battery or from jump-starting additionally strain the circuit.

How can you tell that the NA1J-57K30 is defective?

A defect in the NA1J-57K30 shows up as the airbag warning light in the instrument cluster, as an error message, as a missing connection to the diagnostic tool or as a fault memory that cannot be cleared. The airbags and seatbelt pretensioners may then not deploy in an emergency.

Typical signs at a glance:

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

A check is advisable with each of these signs.

Which vehicles is the NA1J-57K30 fitted in?

The control unit NA1J-57K30 is fitted in these vehicles: Abarth 124 Spider 348 (2017-2019). The assignment is based on the information available for this unit.

The vehicles in detail:

• Abarth 124 Spider 348 (2017-2019)

Comparing the part number on the label of the removed unit with this page is the first step; it only shows that the unit is the correct one. The second step is reading out the fault memory before removal, because only that result 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 N243-57K30.

How does the repair of the NA1J-57K30 work?

You first read out the fault memory and enclose the log, then disconnect the battery. Only then do you remove the control unit NA1J-57K30 and create the repair order online. Then pack the unit well and send it in. Processing at Airbag24 usually takes 3–4 working days.

The sequence is mandatory for safety reasons.

At Airbag24 the unit is examined on the test bench, defective components are replaced, the stored crash data are erased and a function test is carried out. Afterwards the unit goes back to you. The stated duration concerns only this work.

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 NA1J-57K30 get to Airbag24?

You send the control unit NA1J-57K30 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Enclose the printed repair order with the parcel and pack the unit shock-proof.