Airbag control unit with part number 98820-5R40B

What does the airbag control unit 98820-5R40B do?

The airbag control unit 98820-5R40B is the central control unit of the restraint system (SRS) for Nissan. It evaluates the signals from the crash sensors and decides within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light.

The unit monitors the system continuously and checks the connections to all connected components. It stores any irregularities in the fault memory.

After an accident it stores crash data and locks itself. Evaluation, triggering and diagnosis therefore all run through this one control unit.

Why does the control unit 98820-5R40B fail?

This can be caused by crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot delete it, and Airbag24 deletes it during the repair.

Other causes are aged electronic components, cold solder joints and moisture or corrosion at plug connections. Voltage spikes, for example from a weak battery or jump-starting, can also take their toll on the unit.

Crash data is a cause you may run into, but the other causes also occur. Which of them affects your unit only becomes clear during testing.

How can you tell that the 98820-5R40B is defective?

A defect shows up on the airbag warning light in the instrument cluster, which lights up permanently or intermittently, as a fault message in the instrument cluster, as a missing connection to the diagnostic tool, and as a fault memory that cannot be cleared. In a real emergency, airbags and seatbelt pretensioners may then fail to trigger.

The airbag warning light is the most noticeable sign: it either lights up permanently or only intermittently. A fault message in the instrument cluster may appear alongside it, reporting the unit as faulty.

If the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared, that is a further sign. Have this finding checked promptly, because the warning light already shows the fault.

Which vehicles is the 98820-5R40B fitted in?

The airbag control unit 98820-5R40B is fitted in these vehicles: Nissan Kicks P15 (2016-2020) and P15 Facelift (2020-2024). Use this to match the removed unit to your car.

These vehicles are on record for this part number:

• Nissan Kicks P15 (2016-2020)
• Nissan Kicks P15 Facelift (2020-2024)

Before removal, first check the part number on the label of the unit and compare it with this page. This only confirms that you have the right unit. Whether the control unit is defective or a plug or a cable is the cause only becomes clear from the fault memory read out beforehand.

For the same vehicles, we also repair control units with the part numbers 98820-5RX0B.

How does the repair of the 98820-5R40B work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery and only after that remove the control unit. Online, you create a repair order and send the unit in well packed; processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and repairs defective components rather than replacing them. Stored crash data is deleted by Airbag24 during this process, followed by a functional test.

Afterwards, your own unit goes back to you. 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 98820-5R40B get to Airbag24?

You send the control unit 98820-5R40B to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order in the parcel, and pack the unit shock-resistant.