Airbag control unit with part number 77960-TK8-X220-M2

What does the airbag control unit 77960-TK8-X220-M2 do?

The airbag control unit 77960-TK8-X220-M2 controls the restraint system (SRS) at Honda. It evaluates the crash sensors, decides in an emergency on the triggering of the airbags and seatbelt pretensioners, and monitors the entire system. After an accident it stores crash data and locks itself.

The unit is in constant use without the driver noticing it. If it reports a fault, this appears via the airbag warning light.

With the part number 77960-TK8-X220-M2 in front of you, you have the control unit that decides on triggering and warning. Its function is central to safety in the car.

Why does the control unit 77960-TK8-X220-M2 fail?

Crash data from an earlier accident is the most common cause, even if no airbag fired, and a usual diagnostic tool cannot erase it. Further causes include aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes. Airbag24 erases the crash data during the repair.

The first group is the memory after an accident. The unit records the event, regardless of whether an airbag fired. A normal diagnostic tool cannot reach these entries.

The second group concerns the hardware. Aged electronic components and cold solder joints lead to unstable connections and faults over time.

The third group concerns moisture and the power supply. Corrosion on plug connectors and voltage spikes, for example from a weak battery or a jump start, can disturb the control unit.

How can you tell that the 77960-TK8-X220-M2 is defective?

A defect can be recognised by a warning light that stays on permanently or only intermittently, by an error message, by a diagnostic tool without contact, or by a fault memory that cannot be cleared. In that case there is a possibility that airbags and seatbelt pretensioners do not trigger in an emergency.

These indications in detail:

• Airbag warning light on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool has no connection to the control unit
• Fault memory cannot be cleared

If you see any of these signs, have the system checked promptly, because the cause cannot be determined reliably from outside.

Which vehicles is the 77960-TK8-X220-M2 fitted in?

The 77960-TK8-X220-M2 is fitted in these vehicles: Honda Odyssey 5th generation (from 2013). The part number on the unit is the feature you use to check the assignment.

The following overview lists the vehicles known to us for this number.

• Honda Odyssey 5th generation (from 2013)

Before the unit is removed, two checks make sense. Comparing the number on the label with this page only confirms the right unit. Reading the fault memory, on the other hand, 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-THR-A02, 77960-THR-A03, 77960-TK8-A011-M1, 77960-TK8-D01.

How does the repair of the 77960-TK8-X220-M2 work?

Above all, have the fault memory read out and attach the log. Only then disconnect the battery, remove the control unit and create the repair order online. After that the well-packed unit goes to Airbag24, where processing usually takes 3–4 working days.

The order of the steps is prescribed by safety.

At Airbag24 the unit goes on the test bench. Then defective components are repaired, the crash data erased and a function test carried out. After that your own unit is returned.

The 3–4 working days refer only to checking, repairing and testing at Airbag24.

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-X220-M2 get to Airbag24?

There are two options for the route to Airbag24: sending the unit yourself as a parcel, and a UPS collection arranged for an extra charge. UPS takes care of the return shipment after the repair.

A printed repair order belongs in the parcel. Make sure the packaging is shockproof so the control unit arrives undamaged.