Airbag control unit with part number 98820-9BA0B

What does the airbag control unit 98820-9BA0B do?

The airbag control unit 98820-9BA0B is responsible for triggering the restraint devices in Nissan. It reads out the crash sensors, determines in an emergency which airbags and seatbelt pretensioners are to be triggered, and monitors the rest of the system.

If the unit detects a fault, it reports it via the airbag warning light. After an accident, crash data is stored in the memory and the unit locks itself.

Why does the control unit 98820-9BA0B fail?

Crash data that remains stored in the memory after an accident is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Aged components, cold solder joints, moisture and voltage spikes are also possible causes.

Whether or not the airbags deployed makes no difference to the storage.

Ageing and cold solder joints mainly affect the circuit board, while moisture and corrosion tend to affect the connectors. Fluctuations in the vehicle's voltage, for example from a weak battery or a jump start, also place a strain on the unit.

How can you tell that the 98820-9BA0B is defective?

The airbag warning light in the instrument cluster stays on or flickers; the instrument cluster also shows a message, and the diagnostic tool cannot reach the control unit. If the fault memory cannot be cleared, this also indicates a fault. In that case, the airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is not a minor matter; it is a signal from the control unit itself.

Only reading out the fault memory will show whether the control unit or the wiring is affected.

Which vehicles is the 98820-9BA0B fitted in?

This 98820-9BA0B unit is found in these vehicles: Nissan Frontier D40 (2005-2007) and D40 Facelift (2007-2015). The part number on the unit itself determines which unit is fitted in your car.

Here you can see which vehicles are assigned to this part number:

• Nissan Frontier D40 (2005-2007)
• Nissan Frontier D40 Facelift (2007-2015)

Before removal, have the fault memory read out, because only the log shows whether the control unit is defective or whether a connector or cable is the cause. Comparing the part number with this page afterwards only confirms that it is the correct unit.

For the same vehicles, we also repair control units with the part numbers 98820 EB01D.

How does the repair of the 98820-9BA0B work?

First, read out the fault memory and enclose the log; then disconnect the battery and remove the control unit. After that, create a repair order online. Airbag24 checks the unit, repairs defective components, erases the crash data and tests the function. This processing usually takes 3–4 working days.

The order matters: the control unit is only removed once the battery has been disconnected.

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 98820-9BA0B get to Airbag24?

The control unit reaches Airbag24 as a parcel, or you can book a UPS collection for an extra charge. After the repair, your own unit is sent back to you by UPS.

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