Airbag control unit with part number 77960-TVA-B210-M4

What does the airbag control unit 77960-TVA-B210-M4 do?

The airbag control unit 77960-TVA-B210-M4 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident, it stores crash data and locks itself.

During operation, the unit checks the entire restraint system continuously. If it detects a fault, for example in a sensor, a cable or the activation of an airbag, it reports this via the airbag warning light in the instrument cluster.

What the unit records in an impact is held in its memory. Because the control unit decides on the triggering of the airbags, its function carries great weight for safety in the vehicle.

Why does the control unit 77960-TVA-B210-M4 fail?

Stored crash data after an accident is the most common cause on the 77960-TVA-B210-M4, even if no airbag has triggered. A normal diagnostic tool cannot clear it, so it stays in the memory until the repair removes it.

Aged components, cold solder joints and moisture at the plug connections affect the electronics. Corrosion on the contacts and voltage spikes, for example from a weak battery or a jump start, are further causes.

Airbag24 deletes the stored crash data during the repair. Which of the other causes applies in an individual case is only shown by the test on the test bench.

How can you tell that the 77960-TVA-B210-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the 77960-TVA-B210-M4 is defective, and a fault message appears in the instrument cluster. A diagnostic tool without a connection to the control unit, or a fault memory that cannot be cleared, also points to this.

• airbag warning light lights up permanently
• airbag warning light lights up intermittently
• fault message in the instrument cluster
• diagnostic tool has no connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not be able to trigger while the fault persists. A prompt check is therefore sensible.

Which vehicles is the 77960-TVA-B210-M4 fitted in?

Only the fault memory read out shows which cause applies. The airbag control unit 77960-TVA-B210-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

The models in which this unit was fitted are listed here:

• Honda Accord 10th generation (2017-2024)

Two steps help. First, compare the part number on the label of the removed unit with this page, which only confirms that it is the right unit. Second, have the fault memory read out, because only this result shows whether the control unit is defective or a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-T3L-A012-M1, 77960-T3L-C012-M4, 77960-T3L-C020-M4, 77960-T3L-C030-M4, 77960-T3L-F012-M4, 77960-T3L-F020-M4.

How does the repair of the 77960-TVA-B210-M4 work?

First have the fault memory read out and attach the log, then disconnect the battery. Only then remove the control unit 77960-TVA-B210-M4, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24, the unit is checked on the test bench, damaged components are repaired, the crash data is deleted and the function is tested. After that, your own unit is sent 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-TVA-B210-M4 get to Airbag24?

You send the control unit 77960-TVA-B210-M4 as a package, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Enclose the printed repair order and pack the unit securely.