Airbag control unit with part number 77960-TM8-U410-M2

What does the airbag control unit 77960-TM8-U410-M2 do?

On Honda, the airbag control unit 77960-TM8-U410-M2 is the computer that controls the restraint system (SRS). It evaluates the crash sensors, selects the appropriate airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the whole system continuously. After an accident it stores crash data and locks itself.

It stores faults in memory and shows them via the airbag warning light.

Whether the steering or the engine is running has no bearing on the unit; its task is the protection of the occupants.

Why does the control unit 77960-TM8-U410-M2 fail?

Stored crash data after an accident are the most important cause, even when no airbag has fired. A standard diagnostic tool cannot erase them. Aged electronic components, cold solder joints, moisture with corrosion at plug connectors and voltage spikes also place a strain on the unit.

The unit itself generates the crash data as soon as it registers the event. Whether airbags actually fired makes no difference to that.

The other factors relate to ageing, moisture and power fluctuations. Cold solder joints and corroded plug contacts disrupt signal transmission.

Voltage spikes arise, for example, when the battery is weak or a jump start is given.

How can you tell that the 77960-TM8-U410-M2 is defective?

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

If the light does not go out after the start phase, a fault is stored in the system.

Intermittent lighting also means that the vehicle must be checked, and promptly.

Which vehicles is the 77960-TM8-U410-M2 fitted in?

The airbag control unit 77960-TM8-U410-M2 is fitted in these vehicles: Honda Insight 2nd generation (2009-2014).

The list contains the vehicles for which we have stored this part number.

• Honda Insight 2nd generation (2009-2014)

Compare the part number on the label of the removed unit with this page; then you know it is the right unit. Whether the control unit itself is defective, or a plug or a cable is causing the fault, can only be determined by reading out the fault memory. So have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 77960-TM8-A01, 77960-TM8-A020-M2, 77960-TM8-A03.

How does the repair of the 77960-TM8-U410-M2 work?

Have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Next, create the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and runs a function test. Processing at Airbag24 usually takes 3–4 working days.

The sequence is mandatory for your safety.

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-TM8-U410-M2 get to Airbag24?

You can send the unit as a parcel yourself, or book a UPS collection for an extra charge. The return after the repair is handled by Airbag24 via UPS.

Put the printed repair order in the parcel, and pad the control unit shock-proof.