Airbag control unit with part number 77960-T2A-X030-M4

What does the airbag control unit 77960-T2A-X030-M4 do?

The airbag control unit 77960-T2A-X030-M4 is the central unit of the restraint system (SRS) in Honda. It evaluates the signals from the crash sensors, decides within milliseconds in the event of a crash whether airbags and seatbelt pretensioners are triggered, and monitors the entire system.

If it detects a fault, it reports this via the airbag warning light. To do so, it constantly checks sensors, wiring and the connected seatbelt pretensioners.

After an accident, it stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 77960-T2A-X030-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes include aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

• Crash data that cannot be erased with a normal diagnostic tool
• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connectors
• Voltage spikes, for example from a weak battery or jump-starting

Airbag24 erases crash data during the repair and checks the other causes on the test bench.

How can you tell that the 77960-T2A-X030-M4 is defective?

An airbag warning light that stays on permanently or intermittently is the most important sign. Other signs include an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

• Airbag warning light, permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

Have these signs checked promptly, as only then will the system be reliably monitored again.

Which vehicles is the 77960-T2A-X030-M4 fitted in?

The 77960-T2A-X030-M4 is fitted in these vehicles: Honda Accord 9th generation (2012-2019).

The list shows the vehicles stored for this part number.

• Honda Accord 9th generation (2012-2019)

Compare the part number with the label on the removed unit so that the correct unit is confirmed. Have the fault memory read out as well, because only the result shows whether the control unit or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-SEA-G815-M1, 77960-T3L-A012-M1, C0W6K4VDA.

How does the repair of the 77960-T2A-X030-M4 work?

Have the fault memory read out, disconnect the battery, remove the control unit and send it in well packed with an online repair order. Airbag24 usually needs 3–4 working days to process it.

The battery is disconnected before removal, for safety reasons.

Airbag24 tests the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Your own 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 77960-T2A-X030-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Include the printed repair order and pack the unit so that it is shock-resistant.