Airbag control unit with part number 77960-TWB-B010-M4

What does the airbag control unit 77960-TWB-B010-M4 do?

The airbag control unit 77960-TWB-B010-M4 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During operation, the control unit monitors the entire restraint system. If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 77960-TWB-B010-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag was deployed; a normal diagnostic tool cannot erase it. Other causes include ageing electronic components, cold solder joints, moisture at plug connections and voltage spikes.

Crash data remains stored in the unit until it is erased during repair. A deployed airbag is not a prerequisite for this.

The other causes in overview:

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or a jump start

How can you tell that the 77960-TWB-B010-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 cannot reach the control unit, or the fault memory cannot be cleared. In that case, the airbags and seatbelt pretensioners may not deploy in an emergency.

The light is the vehicle's direct warning of a fault in the restraint system. Even a brief illumination shows that the system has registered a fault.

If the fault memory cannot be cleared, it is worth having the cause checked.

Which vehicles is the 77960-TWB-B010-M4 fitted in?

The 77960-TWB-B010-M4 is fitted in these vehicles: Honda Accord 10th generation (2017-2024).

The following vehicles are known to us for this part number:

• Honda Accord 10th generation (2017-2024)

Before you send the unit in, two checks are worthwhile. Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a plug or 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-TWB-B010-M4 work?

For the 77960-TWB-B010-M4, first read out the fault memory, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in well packed. At Airbag24, testing, repair and function test usually take 3–4 working days.

Airbag24 tests the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The 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-TWB-B010-M4 get to Airbag24?

You send the control unit 77960-TWB-B010-M4 in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof before sending it.