Airbag control unit with part number 77960-T6A-H740-M2

What does the airbag control unit 77960-T6A-H740-M2 do?

The airbag control unit 77960-T6A-H740-M2 coordinates the airbags and seatbelt pretensioners in the Honda vehicle. Using the sensor signals it calculates within milliseconds whether a crash requires deployment. After an accident it stores crash data and locks itself.

During normal operation the control unit continuously checks the connections and components of the restraint system. If it finds a deviation, it reports it via the airbag warning light in the instrument cluster.

The crash data remain stored in the unit after the event. This storage is part of the normal function of the control unit.

Why does the control unit 77960-T6A-H740-M2 fail?

The most common cause is crash data from an earlier accident, even if no airbag has deployed; a normal diagnostic tool cannot reach them. Further causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or jump-starting.

The crash data are stored in the control unit after an accident, regardless of whether an airbag was triggered. Because a standard diagnostic tool cannot erase these entries, the fault persists.

The other causes operate out of sight: electronics age, cold solder joints can form, and moisture attacks plug connectors. Voltage spikes, for example from jump-starting or a weak battery, additionally stress the circuit.

How can you tell that the 77960-T6A-H740-M2 is defective?

A defect shows itself when the airbag warning light in the instrument cluster stays on permanently or intermittently, an error message appears, the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

The warning light is the first sign you notice in everyday use. If it comes on, have the vehicle checked without delay.

An error message in the instrument cluster confirms the suspicion, and the missing connection to the diagnostic tool is a further indication. A fault memory that cannot be emptied likewise points to a fault in the control unit or its immediate surroundings.

Which vehicles is the 77960-T6A-H740-M2 fitted in?

The 77960-T6A-H740-M2 is fitted in these vehicles: Honda Odyssey 5th generation (from 2013).

The models that match this part number are listed below.

• Honda Odyssey 5th generation (from 2013)

Compare the number on the label of the removed unit with this page. This only shows that you have the right unit in front of you. Also have the fault memory read out before removal, because only this log 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-THR-A02, 77960-THR-A03, 77960-TK8-A011-M1, 77960-TK8-D01.

How does the repair of the 77960-T6A-H740-M2 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit 77960-T6A-H740-M2. Then create a repair order online and send the unit in well packed. Airbag24 checks it on the test bench, repairs defects, erases stored crash data and carries out a function test before the unit is returned to you.

The order is mandatory for safety reasons: the control unit may only be removed after the battery has been disconnected.

Processing at Airbag24 usually takes 3–4 working days. This period covers checking, repairing and testing in our own facility.

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-T6A-H740-M2 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair the unit is returned to you by UPS.

Enclose the printed repair order in the parcel and pack the control unit shock-resistant.