Airbag control unit with part number 77960-TWC-H030-M4

What does the airbag control unit 77960-TWC-H030-M4 do?

The airbag control unit 77960-TWC-H030-M4 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and reports faults via the airbag warning light. After an accident it stores crash data and locks itself.

In normal driving the unit monitors the sensors, the wiring and the output stages, and so continuously checks the entire restraint system.

In an emergency the evaluation has to be extremely fast, which is why every trigger is tied to a fixed logic.

Why does the control unit 77960-TWC-H030-M4 fail?

The most common cause is crash data that the control unit 77960-TWC-H030-M4 has stored after an accident, even without an airbag triggering; a normal diagnostic tool cannot erase it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage peaks.

Crash data is a record of what the control unit registered during an accident. It remains in the unit even if no airbag was triggered.

Aged electronic components and cold solder joints gradually impair the function.

Moisture and corrosion at plug connections lead to contact problems, and voltage peaks, for example with a weak battery or a jump start, stress the electronics.

How can you tell that the 77960-TWC-H030-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In that case, the airbags and seatbelt pretensioners may not trigger in an emergency.

The signs in detail:

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

Which vehicles is the 77960-TWC-H030-M4 fitted in?

The airbag control unit 77960-TWC-H030-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

Here are the vehicles for which this unit is on record:

• Honda Accord 10th generation (2017-2024)

First compare the part number on the label of the removed unit with this page; this only ensures that you have the right unit. Then have the fault memory read, because only that shows whether the control unit is defective or whether 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-TWC-H030-M4 work?

First read out the fault memory and attach the log, then disconnect the battery and remove the control unit 77960-TWC-H030-M4. Then create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

The order is mandatory for safety reasons, and removal takes place only after the battery has been disconnected.

At Airbag24 the unit is inspected on the test bench, defective components are repaired, stored crash data is erased and a function test is carried out. 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-TWC-H030-M4 get to Airbag24?

You send the control unit 77960-TWC-H030-M4 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order in the parcel and pack the unit shockproof.