Airbag control unit with part number 98820 5M304 J

What does the airbag control unit 98820 5M304 J do?

The airbag control unit 98820 5M304 J forms the central control unit of the restraint system (SRS) in Nissan. It reads the position via the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. It shows faults via the airbag warning light.

After an accident the unit stores crash data and locks itself. You have to take this property into account in every fault-finding and every repair.

Why does the control unit 98820 5M304 J fail?

The most common cause for the 98820 5M304 J is stored crash data after an accident, even if no airbag has deployed. With this control unit, erasing the crash data is often not possible; if you want it erased, contact Airbag24 briefly before sending the unit, and Airbag24 will then check the part number. Other possible causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data therefore remains in memory even if the accident did not trigger an airbag. A standard diagnostic tool cannot remove it.

Hardware causes such as aged electronic components or moisture at plug connections cannot be reliably detected from outside. Voltage spikes, for example from a weak battery or a jump start, also belong among them.

How can you tell that the 98820 5M304 J is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently; in addition a fault message appears, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. If such signs appear on the 98820 5M304 J, a defect is likely.

Airbags and seatbelt pretensioners may then not deploy in an emergency. The warning light reports the finding itself, so you do not have to determine it first; have it checked promptly.

Which vehicles is the 98820 5M304 J fitted in?

The 98820 5M304 J belongs to these vehicles: Nissan Almera N16 Facelift (2002-2006) and N16 (2000-2002).

The list shows the models that our data assigns to this part number:

• Nissan Almera N16 Facelift (2002-2006)
• Nissan Almera N16 (2000-2002)

Comparing the part number on the label of the removed unit with this page ensures that you have the right unit. Whether the control unit itself is defective, or a connector or cable causes the fault, is shown only by the fault memory. Have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 285001316, 285001318, 285001319, 285001638, 28556 5M303, 28556-BN903.

How does the repair of the 98820 5M304 J work?

First have the fault memory read out and the log enclosed; then disconnect the battery and only then remove the 98820 5M304 J. Next create the repair order online and send the well-packed unit. Airbag24 examines it on the test bench, repairs defective components and runs a function test.

The order is for your safety, since removal starts only once the battery is disconnected. After the check, your own unit goes back to you. Processing at Airbag24 usually takes 3–4 working days.

If you want the crash data erased, contact Airbag24 briefly before sending the unit.

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 5M304 J get to Airbag24?

You send the control unit 98820 5M304 J as a parcel to Airbag24, or you book a UPS collection for an extra charge. After the repair, you receive the unit back by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shockproof.