Airbag control unit with part number 98820-JJ90A

What does the airbag control unit 98820-JJ90A do?

The airbag control unit 98820-JJ90A forms the control centre of the restraint system (SRS) at Infiniti. It processes the signals from the impact sensors and decides in a crash, within fractions of a second, which airbags and seatbelt pretensioners fire. After an accident it stores crash data and locks itself.

The system checks the unit continuously; the firing circuits belong to this as well as the sensors. If it detects a deviation, it shows this via the airbag warning light.

The process inside the unit stays hidden from the driver; only the result is visible.

Why does the control unit 98820-JJ90A fail?

The most common cause is crash data stored after an accident, even if no airbag fired. These cannot be erased with an ordinary diagnostic tool. Other factors include ageing electronics, moisture, corrosion at plug connections and voltage spikes.

Crash data remains stored in the unit after an accident. It is removed only during the repair by Airbag24.

The other causes tend to develop gradually. Cold solder joints, ageing and moisture affect the circuit board or the plugs, and voltage spikes arise, for example, with a weak battery or a jump start.

How can you tell that the 98820-JJ90A is defective?

In the event of a defect the airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. The result may be that airbags and seatbelt pretensioners do not fire in a crash.

The light is a warning signal and calls for prompt checking.

Which vehicles is the 98820-JJ90A fitted in?

At Infiniti the airbag control unit 98820-JJ90A is fitted in this vehicle: Infiniti G37 V36 (2007-2016).

The vehicle list follows now as a separate line.

• Infiniti G37 V36 (2007-2016)

Comparing the part number on the label of the removed unit with this page only shows that you have the correct unit. It is also important to read out the fault memory, because it shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 98820-JK83B, 988201NCOA, 988201ND0A, 988201ND1A, 988203LZ0A, 98820JJ50A.

How does the repair of the 98820-JJ90A work?

First the fault memory is read out and the log is enclosed; then disconnect the battery and remove the control unit. Next create a repair order online and send the unit off packed. For the work at Airbag24 you should allow 3–4 working days as a rule.

Airbag24 tests the unit on the test bench, replaces defective components and removes the crash data. A functional test follows, then your own unit returns to you.

The 3–4 working days cover checking, repairing and testing only. 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-JJ90A get to Airbag24?

You either send the control unit 98820-JJ90A to Airbag24 as a parcel, or book a UPS collection for an extra charge. After the repair you receive your own unit back by UPS.

The printed repair order goes into the parcel, and the unit is packed shockproof.