Airbag control unit with part number 98820-1DF0B

What does the airbag control unit 98820-1DF0B do?

For Nissan, the airbag control unit 98820-1DF0B controls the restraint system (SRS) centrally. It evaluates the crash sensors, decides in an accident within fractions of a second on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. It shows faults via the airbag warning light.

As soon as a fault is detected, the control unit creates an entry in the fault memory. The monitoring covers the entire restraint system, not just individual parts of it.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 98820-1DF0B fail?

Stored crash data is considered the most common cause on the 98820-1DF0B, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes. With this control unit, deleting the crash data is often not possible; if you would like it deleted, contact Airbag24 briefly before sending the unit in, so that it can check the part number.

The following points come on top of this:

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

Whether one of these is the cause is only shown by examining the control unit.

How can you tell that the 98820-1DF0B is defective?

The airbag warning light in the instrument cluster lights up on the 98820-1DF0B, either permanently or intermittently. A fault message also appears in the instrument cluster, and the diagnostic tool gets no connection to the control unit.

Look out for the following signs:

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• no connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. The warning light is one of the indicators you should keep an eye on in the instrument cluster.

Which vehicles is the 98820-1DF0B fitted in?

The control unit 98820-1DF0B is fitted in these vehicles: Nissan X-Trail T31 (2007-2010) and T31 Facelift (2010-2014). Use this list to check whether your vehicle is among them.

The vehicles in detail:

• Nissan X-Trail T31 (2007-2010)
• Nissan X-Trail T31 Facelift (2010-2014)

First compare the part number on the label of the removed unit with this page. Also have the fault memory read out before removal, because only this result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820JH200, 98820JH30A, 98820JH40A, 98820JH43A.

How does the repair of the 98820-1DF0B work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send the unit in, well packed. Airbag24 checks the 98820-1DF0B on the test bench, replaces defective components and carries out a function test; processing at Airbag24 usually takes 3–4 working days.

The order of these steps is mandatory for safety reasons. It applies to every removal.

If you would like the crash data deleted, contact Airbag24 briefly before sending the unit in.

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 98820-1DF0B get to Airbag24?

You send the control unit 98820-1DF0B in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

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