Airbag control unit with part number 98820 7Y100

What does the airbag control unit 98820 7Y100 do?

The airbag control unit 98820 7Y100 is the central control unit of the restraint system (SRS) for Nissan. It evaluates the crash sensors, decides in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

The monitoring runs in the background without the driver noticing anything. As soon as a fault appears in the system, it is stored and displayed.

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

Why does the control unit 98820 7Y100 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool does not erase it. Other causes are aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

In detail, these points come into consideration:

• Aged electronic components that lose performance over the years
• Cold solder joints on the circuit board
• Moisture and corrosion on plug connections
• Voltage spikes, for example from a weak battery or jump-starting

Crash data is the classic cause, because the vehicle can keep running after the incident. However, the entry remains in the memory until the unit is repaired.

How can you tell that the 98820 7Y100 is defective?

A defect in the 98820 7Y100 shows itself through the airbag warning light in the instrument cluster, through a fault message in the instrument cluster, through a diagnostic tool without connection to the control unit and through a fault memory that cannot be cleared.

The warning light can stay on permanently or only intermittently, and either case is a sign that should not be ignored. Airbags and seatbelt pretensioners may possibly not deploy in an emergency if the unit is faulty. The warning light shows this state.

A missing connection to the diagnostic tool is another sign that the workshop monitors closely.

Which vehicles is the 98820 7Y100 fitted in?

The control unit 98820 7Y100 is fitted in these vehicles: Nissan Maxima A34 (2003-2006) and A34 Facelift (2006-2008).

Here follows the overview of the vehicles for which this part number is recorded.

• Nissan Maxima A34 (2003-2006)
• Nissan Maxima A34 Facelift (2006-2008)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Have the fault memory read beforehand, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 988209N00C.

How does the repair of the 98820 7Y100 work?

First have the fault memory read and enclose the log, then disconnect the battery and remove the control unit. Afterwards create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, repairs defective components and carries out a functional test. Stored crash data is erased by Airbag24 in the process. Afterwards your own unit goes back to you.

The time applies solely to testing, repairing and checking at Airbag24.

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 7Y100 get to Airbag24?

You send the control unit 98820 7Y100 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order in the parcel and pack the unit shock-resistant.