Airbag control unit with part number 98820-1MS1A

What does the airbag control unit 98820-1MS1A do?

The airbag control unit 98820-1MS1A coordinates the restraint system (SRS) of Infiniti. It checks the signals from the crash sensors and, in an accident, triggers the appropriate airbags and seatbelt pretensioners within milliseconds.

During operation it checks the components of the system continuously. If it finds a fault, it reports this via the airbag warning light in the instrument cluster. After an accident it stores crash data and locks itself afterwards.

Why does the control unit 98820-1MS1A fail?

The most common cause on the 98820-1MS1A is crash data from an accident, even if no airbag was triggered. Further reasons are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

An ordinary diagnostic tool cannot remove the crash data. Airbag24 erases it during the repair. The other causes in brief:

• aged components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 98820-1MS1A is defective?

A defective 98820-1MS1A shows itself through the airbag warning light, which stays on permanently or intermittently. Fault messages, a missing connection to the diagnostic tool and a fault memory that cannot be cleared also point to a defect.

Watch for these signs:

• Airbag warning light permanently or intermittently on
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

Airbags and seatbelt pretensioners may then fail to deploy in an emergency. Have the finding examined promptly.

Which vehicles is the 98820-1MS1A fitted in?

The 98820-1MS1A is fitted in these vehicles: Infiniti M37 Y51 (2010-2013).

You will find the matching models in this overview:

• Infiniti M37 Y51 (2010-2013)

Compare the number on the label of your removed device with this page. Then you know that you have the right device. The comparison does not tell you the cause, however. Only the fault memory that has been read out shows whether the control unit itself or a plug or cable is at fault.

For the same vehicles, we also repair control units with the part numbers 98820-1MA1C.

How does the repair of the 98820-1MS1A work?

First have the fault memory read out and attach the log to the device. Then disconnect the battery, remove the 98820-1MS1A and create a repair order online. Pack the device well and send it in.

This order is binding, because the control unit may only be removed once the memory has been read out and the battery disconnected.

At Airbag24 a test bench examines the device, defective components are replaced and the crash data is erased. Processing usually takes 3–4 working days. Afterwards the device is 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 98820-1MS1A get to Airbag24?

You send the 98820-1MS1A to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends the 98820-1MS1A back by UPS.

Attach the printed repair order to the parcel and pack the control unit shockproof.