Airbag control unit with part number 98820-3LM1B

What does the airbag control unit 98820-3LM1B do?

The control unit 98820-3LM1B works as the central control unit of the SRS system of Nissan. It records the signals from the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If it detects a fault, the airbag warning light in the instrument cluster comes on. This is how the fault becomes visible to you.

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

Why does the control unit 98820-3LM1B fail?

The most common cause on the control unit 98820-3LM1B is crash data from an accident, which is stored even if no airbag has been triggered; a normal diagnostic tool cannot erase it. Other causes are ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is created inside the unit itself and cannot be recognised from outside. Erasing it is therefore part of the repair at Airbag24.

The other causes relate to the electronics and their surroundings. Over time, components age, solder joints can turn cold, moisture attacks plug connections, and voltage spikes occur, for example with a weak battery or jump-starting.

How can you tell that the 98820-3LM1B is defective?

A defect in the 98820-3LM1B can be recognised by the airbag warning light, which stays on permanently or intermittently, by a fault message in the instrument cluster, by a diagnostic tool without connection to the control unit, and by a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

The warning light reports that the system itself has detected something. Even if the car runs without any noticeable problems in everyday use, this message deserves attention.

Have the cause clarified rather than overlooking the light.

Which vehicles is the 98820-3LM1B fitted in?

The control unit 98820-3LM1B is fitted in these vehicles: Nissan NV200 M20 (2009-2021).

The overview lists the vehicles recorded for this part number.

• Nissan NV200 M20 (2009-2021)

Comparing the part number on the label with this page ensures that you have removed the right unit. Also have the fault memory read out: only this result shows whether the control unit is defective or whether a cable or plug is the cause.

For the same vehicles, we also repair control units with the part numbers 285563LS0E, 98820-1PD0B.

How does the repair of the 98820-3LM1B work?

On the 98820-3LM1B, first have the fault memory read out and enclose the log. Then disconnect the battery, and only after that remove the control unit. Next, create a repair order online and pack the unit carefully for sending.

At Airbag24, the unit is examined on the test bench. Defective components are replaced where necessary, stored crash data is erased and a functional test is carried out. Processing usually takes 3–4 working days.

Afterwards, your own unit is returned 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 98820-3LM1B get to Airbag24?

You send the control unit 98820-3LM1B either as a parcel or have it collected by UPS for an extra charge. After the repair, Airbag24 returns the unit by UPS.

The printed repair order goes into the parcel; the unit should be packed shock-proof.