Airbag control unit with part number 98820-5AA0B

What does the airbag control unit 98820-5AA0B do?

The airbag control unit 98820-5AA0B is the control centre of the SRS in Nissan vehicles. It processes the signals from the crash sensors, decides in a collision within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the entire system. Faults appear on the airbag warning light.

The unit is connected to the sensors and the triggering elements and checks their function continuously.

After an accident it stores crash data and locks itself.

Why does the control unit 98820-5AA0B fail?

The most common cause is stored crash data after an accident, even if no airbag was triggered. A normal diagnostic tool cannot delete it. In addition, ageing components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes come into consideration.

Crash data is not noticeable in everyday driving. A vehicle can continue to be driven inconspicuously after the event, while the data remain in the control unit.

The other causes concern the technical condition of the control unit. Components age, solder joints can go cold, and moisture leads to corrosion on plug connectors. Voltage spikes, for example from a weak battery or a jump start, put a strain on the electronics.

Airbag24 deletes the crash data during the repair.

How can you tell that the 98820-5AA0B is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when there is a defect in the 98820-5AA0B. The instrument cluster also shows an error message, the diagnostic tool cannot reach the control unit, and a fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners could possibly fail to deploy.

The warning light is the system's direct display for the driver. If it comes on, that is a clear sign that the system needs to be checked.

A missing connection to the diagnostic tool is also a finding that requires clarification.

Which vehicles is the 98820-5AA0B fitted in?

The 98820-5AA0B is fitted by Nissan in this vehicle: Nissan Murano Z52 (2015-2024).

The assignments for this part number are listed here.

• Nissan Murano Z52 (2015-2024)

Comparing the part number on the label of the removed unit with this page confirms that you have the correct unit. It says nothing about the cause. For this reason, have the fault memory read out before removal. Only the result shows whether the control unit is defective or whether a plug or cable is responsible.

For the same vehicles, we also repair control units with the part numbers 629198200, 988205AA0A.

How does the repair of the 98820-5AA0B work?

You read out the fault memory first and attach the log. Only after disconnecting the battery do you remove the control unit 98820-5AA0B. Then you create the repair order online and send in the well-packed unit. Airbag24 usually needs 3–4 working days for testing, repair and function test.

Airbag24 tests the control unit on the test bench, replaces defective components, deletes the crash data and carries out a function 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 98820-5AA0B get to Airbag24?

You send the control unit 98820-5AA0B as a parcel or arrange a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

The printed repair order goes into the parcel, and the control unit is packed shock-proof.