Airbag control unit with part number 98820 8H405

What does the airbag control unit 98820 8H405 do?

The airbag control unit 98820 8H405 controls the SRS restraint system of Nissan. It evaluates signals from the crash sensors, determines within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If the unit detects a fault, it switches on the airbag warning light and stores the fault so that it can be found during diagnosis.

After an accident, it stores crash data and locks itself.

Why does the control unit 98820 8H405 fail?

The causes of failure include stored crash data. After an accident this data stays in the unit even if no airbag has deployed, and a standard diagnostic tool cannot remove it.

Such entries hardly stand out while driving. Only when the unit is read out does the finding become apparent, possibly without the owner thinking of the accident.

Other causes develop over time. Electronic components age, soldered joints lose contact, and moisture or corrosion on plugs attacks the connections. Voltage spikes, for example from a weak battery or a jump start, add to the risk.

How can you tell that the 98820 8H405 is defective?

The airbag warning light signals a defect when it lights up permanently or intermittently. In addition there may be an error message in the instrument cluster, no connection from the diagnostic tool, and a fault memory that cannot be cleared.

Typical signs in detail:

• airbag warning light that stays on permanently or intermittently
• error message in the instrument cluster
• the diagnostic tool cannot establish a connection with the control unit
• the fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. You should therefore take such signs seriously.

Which vehicles is the 98820 8H405 fitted in?

In these models the unit with part number 98820 8H405 is fitted: Nissan X-Trail T30 (2001-2003) and T30 Facelift (2003-2007).

The overview below lists the vehicles known to us for this control unit.

• Nissan X-Trail T30 (2001-2003)
• Nissan X-Trail T30 Facelift (2003-2007)

Before removal, the fault memory should be read out, so that it is clear whether the control unit itself is defective or a plug or cable. Then compare the part number on the label of the removed unit with this page.

For the same vehicles, we also repair control units with the part numbers 41650EQ070, 988208H40C, 98820JH43A, A68-000U06.

How does the repair of the 98820 8H405 work?

Before removal you read out the fault memory, disconnect the battery and remove the control unit. Then create a repair order online and send in the well-packed unit. Airbag24 generally needs 3–4 working days for checking, repairing and testing it.

Airbag24 checks the unit on the test bench, replaces defective components, deletes crash data and carries out a function test. Your own unit is then 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 8H405 get to Airbag24?

You send your unit to Airbag24 as a parcel, or alternatively book a UPS collection for an extra charge. Airbag24 returns the control unit 98820 8H405 by UPS after the repair.

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