Airbag control unit with part number 98820 8H40E

What does the airbag control unit 98820 8H40E do?

The airbag control unit 98820 8H40E coordinates the entire restraint system in the Nissan. It checks the signals from the crash sensors, selects the airbags and seatbelt pretensioners to activate in an accident, and monitors the condition of the system continuously.

Faults are indicated via the airbag warning light. If an accident has been registered, the unit stores the crash data and then remains locked.

Why does the control unit 98820 8H40E fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; these cannot be erased with normal diagnostic equipment. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A fault after an accident does not necessarily involve deployed airbags, because the unit also registers events in which nothing was triggered.

Aged components and cold solder joints are weak points that eventually cause contact problems. Moisture and corrosion attack plug connections.

Voltage spikes, for example with a weak battery or when a jump start is connected, additionally stress the electronics.

How can you tell that the 98820 8H40E is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently, and an error message also appears. In addition there is no connection to the diagnostic tool and a fault memory that cannot be cleared; in a critical situation, the airbags and seatbelt pretensioners may then not be able to deploy.

The warning light is the most important warning sign, because it shows a detected fault directly in view. If it stays on after the ignition is switched on, a fault is present.

If the connection to the diagnostic tool is missing, the cause is not automatically the control unit; cables and connectors are possible causes too.

Which vehicles is the 98820 8H40E fitted in?

The control unit 98820 8H40E is fitted in these vehicles: Nissan X-Trail T30 (2001-2003) and T30 Facelift (2003-2007).

The following models are on record for this part number:

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

Comparing the part number on the label of the removed unit with this page only shows that it is the correct unit. Having the fault memory read out beforehand is the step that 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 41650EQ070, 988208H40C, 98820JH43A, A68-000U06.

How does the repair of the 98820 8H40E work?

Before you remove the unit, have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online; send the well-packed unit in. Checking, repairing and testing at Airbag24 usually takes 3–4 working days.

The sequence serves safety, which is why the removal only follows once the battery has been disconnected.

At Airbag24, defective components are replaced, the crash data is erased, and the unit is then function-tested. The unit then comes back 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 8H40E get to Airbag24?

A UPS collection for an extra charge or shipping as a parcel brings the control unit 98820 8H40E to Airbag24. The return after the repair is made by UPS.

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