Airbag control unit with part number 77960-THR-A020-M2

What does the airbag control unit 77960-THR-A020-M2 do?

The airbag control unit 77960-THR-A020-M2 forms the central control unit of the restraint system (SRS) for Honda. It checks the signals from the crash sensors, decides within milliseconds in the event of an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system constantly. After an accident, it stores crash data and locks itself.

Monitoring covers sensors, wiring, seatbelt pretensioners and airbags. If the unit detects a fault, it shows it via the airbag warning light in the instrument cluster.

The result of this check determines whether airbags and seatbelt pretensioners are correctly triggered in an emergency. The control unit depends on this, which is why every fault should be taken seriously.

Why does the control unit 77960-THR-A020-M2 fail?

Most often the cause lies in crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool cannot remove it. Further triggers are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

At Airbag24, the crash data is erased during repair. The other causes can only be narrowed down after testing on the test bench.

Moisture and corrosion attack the contacts, aged components lose performance over time, and cold solder joints can break under vibration.

How can you tell that the 77960-THR-A020-M2 is defective?

The airbag warning light in the instrument cluster stays on constantly or intermittently; in addition, an error message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. In this state, airbags and seatbelt pretensioners may possibly not deploy in an emergency.

Typical signs at a glance:

• Airbag warning light that stays on constantly or intermittently
• Error message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory that cannot be cleared

One look at the warning light is enough to act. Do not wait for the problem to resolve itself.

Which vehicles is the 77960-THR-A020-M2 fitted in?

The control unit 77960-THR-A020-M2 is fitted in these vehicles: Honda Odyssey 5th generation (from 2013).

The list shows the vehicles for which this unit is recorded in our data.

• Honda Odyssey 5th generation (from 2013)

Compare the part number on the label of the removed unit with this page; this ensures that it is the correct unit. Have the fault memory read out beforehand, because only this log shows whether the control unit is defective or a connector 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-THR-A020-M2 work?

First have the fault memory read out and attach the log to the unit; then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in well packed. Airbag24 usually needs 3–4 working days for checking, repair and function test.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards 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-THR-A020-M2 get to Airbag24?

You send the control unit 77960-THR-A020-M2 in as a parcel or book a UPS collection for an extra charge; after the repair, Airbag24 returns it by UPS.

Enclose the printed repair order and pack the unit shock-proof.