Airbag control unit with part number 77960-TK8-A220-M2

What does the airbag control unit 77960-TK8-A220-M2 do?

The airbag control unit 77960-TK8-A220-M2 coordinates the restraint system (SRS) of Honda. Based on the signals from the crash sensors, it decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered; at the same time it checks the system permanently. It reports detected faults via the airbag warning light.

During operation the unit monitors sensors, wiring and its own processes. Faults it finds are stored in the fault memory, which a diagnostic tool can read out.

After an accident it creates crash data and locks itself.

Why does the control unit 77960-TK8-A220-M2 fail?

Most often the cause of a fault in the control unit 77960-TK8-A220-M2 is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

During the repair Airbag24 erases the crash data. The other causes are listed here:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump starting

How can you tell that the 77960-TK8-A220-M2 is defective?

With a defect in the 77960-TK8-A220-M2, the airbag warning light in the instrument cluster lights up first, permanently or intermittently. In addition there may be an error message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be erased. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

This light is the central warning sign of the system. Have it checked promptly.

If the fault memory cannot be emptied, a more detailed investigation is indicated.

Which vehicles is the 77960-TK8-A220-M2 fitted in?

The control unit 77960-TK8-A220-M2 is fitted in these vehicles: Honda Odyssey 5th generation (from 2013).

The following vehicles are recorded for this part number:

• Honda Odyssey 5th generation (from 2013)

Check the number on the label of the removed unit against this page; this confirms that it is the right unit. Have the fault memory read out beforehand, because only that log shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-THR-A02, 77960-THR-A03, 77960-TK8-A011-M1, 77960-TK8-D01.

How does the repair of the 77960-TK8-A220-M2 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit 77960-TK8-A220-M2 and create a repair order online; send it well packed. Airbag24 inspects and repairs it, erases the crash data and tests the unit; for this Airbag24 usually needs 3–4 working days.

Processing covers only inspection, repair and function testing at Airbag24. After that your own unit is 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-TK8-A220-M2 get to Airbag24?

You send the control unit 77960-TK8-A220-M2 as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel, and the unit must be packed shockproof.