Airbag control unit with part number K8820-1MR1A

What does the airbag control unit K8820-1MR1A do?

The airbag control unit K8820-1MR1A controls the restraint system (SRS) of Infiniti. It checks the signals from the crash sensors, decides within milliseconds in the event of an impact which airbags and seatbelt pretensioners to trigger, and monitors the entire system continuously.

After an accident it stores crash data and locks itself. Any faults that occur are indicated via the airbag warning light.

Why does the control unit K8820-1MR1A fail?

Most often this is due to crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot remove it; Airbag24 removes it during the repair. Other possible causes include aged components, corrosion on plugs, cold solder joints and voltage spikes.

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

Which cause applies is only determined by an examination.

How can you tell that the K8820-1MR1A is defective?

A defect is indicated by an airbag warning light that stays on permanently or intermittently, by error messages in the instrument cluster, by a lack of connection between the diagnostic tool and the control unit, or by a fault memory that cannot be cleared. If you notice these signs, the K8820-1MR1A should be checked.

The airbag warning light is the most important signal your vehicle gives you. It indicates a detected fault, and the message in the instrument cluster confirms it. In an emergency, airbags and seatbelt pretensioners may fail to deploy.

Which vehicles is the K8820-1MR1A fitted in?

Before removal, check whether your model is included. The K8820-1MR1A is fitted in these vehicles: Infiniti M35 Y51 (2010-2013).

Here you can see the models stored for this part number.

• Infiniti M35 Y51 (2010-2013)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Read out the fault memory beforehand, because only this shows whether the control unit itself or a plug or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 98820-1MX0B, K8820-1MX0B.

How does the repair of the K8820-1MR1A work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery and only afterwards remove the K8820-1MR1A. Create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

After receipt, Airbag24 checks the control unit on the test bench, replaces defective components, deletes the stored crash data and carries out a functional test. The repaired unit is then 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 K8820-1MR1A get to Airbag24?

You can send in the K8820-1MR1A as a parcel or book a UPS collection for an extra charge. Airbag24 returns the unit by UPS after the repair.

Pack the printed repair order into the parcel and pack the control unit securely to withstand impact.