Airbag control unit with part number 98820-9HL0B

What does the airbag control unit 98820-9HL0B do?

The airbag control unit 98820-9HL0B is the central control unit of the restraint system (SRS) for Nissan. It evaluates the crash sensors, decides within milliseconds in an accident and controls the airbags and seatbelt pretensioners.

It also monitors the entire system continuously. If it detects a fault, the airbag warning light comes on. After an accident it stores crash data and locks itself.

Why does the control unit 98820-9HL0B fail?

The most common cause is crash data stored after an accident, even if no airbag has been triggered; a normal diagnostic tool cannot erase it. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in the memory until it is specifically removed, which is why the fault stays visible in the system. The other triggers at a glance:

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or a jump start

The list summarises the triggers that may come into question alongside the crash data.

How can you tell that the 98820-9HL0B is defective?

The airbag warning light in the instrument cluster lights permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

• Airbag warning light on, permanently or intermittently
• The instrument cluster shows a fault
• The diagnostic tool cannot establish a connection
• The fault memory remains after clearing

With these signs, a prompt check is advisable before you rely on the protective function.

Which vehicles is the 98820-9HL0B fitted in?

The airbag control unit 98820-9HL0B is used in this vehicle: Nissan Altima L33 (2012-2018).

Below you will find the vehicles to which this part number belongs.

• Nissan Altima L33 (2012-2018)

(a) Comparing the part number on the label of the removed unit with this page confirms only that you have the correct unit. (b) The fault memory must be read out in advance, because only the 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 98820-3TA0B, 98820-3TA9C, 98820-9HN0A, 98820-9HS9A.

How does the repair of the 98820-9HL0B work?

You read out the fault memory, enclose the log and disconnect the battery. Only then do you remove the control unit 98820-9HL0B. Create the repair order online and send the unit in packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, replaces defective components, erases crash data and runs a function test. Then your own unit goes 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 98820-9HL0B get to Airbag24?

You send the control unit 98820-9HL0B as a parcel or book a UPS collection for an extra charge. The return after repair is made by UPS.

The unit must be packed shock-resistant, and the printed repair order goes in the parcel.