Airbag control unit with part number 77960-T7A-J820-M2

What does the airbag control unit 77960-T7A-J820-M2 do?

The airbag control unit 77960-T7A-J820-M2 is the unit that controls the restraint system (SRS) of Honda. It checks the sensor signals, decides in a crash within milliseconds on the triggering of airbags and seatbelt pretensioners, and keeps the system under constant watch.

The unit monitors the entire system without interruption. If it detects a fault, the airbag warning light in the instrument cluster lights up.

After an accident it creates crash data and locks itself.

Why does the control unit 77960-T7A-J820-M2 fail?

Stored crash data from an accident is the most common cause, even if no airbag has deployed. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, such as from a weak battery or a jump start.

Crash data remains stored after the accident, and a normal diagnostic tool cannot erase it. Airbag24 erases it during the repair.

The other causes relate to age, connections and power supply. Electronics age, solder joints can become brittle, and moisture and corrosion affect plug connectors. Voltage spikes, for example with a weak battery or a jump start, can also trigger faults.

How can you tell that the 77960-T7A-J820-M2 is defective?

Signs of a defect are the airbag warning light, an error message in the instrument cluster, a missing contact to the diagnostic tool, and a fault memory that cannot be cleared. If these signs persist, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

Typical signs in everyday use:

• airbag warning light stays on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool receives no connection to the control unit
• fault memory cannot be cleared

A check shows where the problem comes from. Until then, take the signs seriously and have the system checked promptly.

Which vehicles is the 77960-T7A-J820-M2 fitted in?

This unit with the number 77960-T7A-J820-M2 is fitted in these vehicles: Honda HR-V 2nd generation (2015-2022).

Here is the assignment at a glance:

• Honda HR-V 2nd generation (2015-2022)

Comparing the part number on the label of the removed unit with this page only shows that it is the right unit. It says nothing about the condition. Therefore have the fault memory read out beforehand, because only this result shows whether the control unit itself or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-3V0-A81, 77960-T7S-A21, 77960-T7S-A212-M2, 77960T7SK410M2.

How does the repair of the 77960-T7A-J820-M2 work?

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

This sequence must be observed for safety reasons. Removal only takes place after the readout and after the battery has been disconnected.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards 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 77960-T7A-J820-M2 get to Airbag24?

You arrange the shipment yourself by parcel, or alternatively book a UPS collection for an extra charge. The return of your own unit after the repair is handled by UPS.

Enclose the printed repair order in the parcel and pack the control unit shockproof.