Airbag control unit with part number 77960-THR-X020-M2

What does the airbag control unit 77960-THR-X020-M2 do?

As the central SRS module, the airbag control unit 77960-THR-X020-M2 controls the airbags and seatbelt pretensioners of Honda. Using the signals from the crash sensors, it detects an accident and triggers the protection systems within milliseconds. At the same time, it monitors itself and the entire restraint system without interruption.

The unit indicates faults via the airbag warning light in the instrument cluster. This light is therefore the most important warning signal you will notice in everyday driving.

After an accident, the unit stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 77960-THR-X020-M2 fail?

Stored crash data is the most common cause of the 77960-THR-X020-M2 failing, even if no airbag was triggered in the accident. A normal diagnostic tool cannot erase this data. Aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start are also possible causes.

Crash data is also created in events where no airbag fires. Anyone who knows this checks the memory of the control unit first when a fault occurs.

The other causes are deliberately described in general terms, because they cannot be narrowed down in advance. Ageing, moisture and voltage spikes act on the electronics from different directions.

During the repair at Airbag24, the crash data is erased.

How can you tell that the 77960-THR-X020-M2 is defective?

On the 77960-THR-X020-M2, the airbag warning light in the instrument cluster lights up permanently or intermittently. A fault message also appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In this case, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

Even if the light comes on only now and then, it is a finding that deserves an inspection. The signs occur individually or together.

The warning light alone does not reveal whether the control unit itself or a cable is affected. Only reading out the fault memory with a diagnostic tool answers this question.

Which vehicles is the 77960-THR-X020-M2 fitted in?

The 77960-THR-X020-M2 is fitted in these vehicles: Honda Odyssey 5th generation (from 2013).

The vehicle list for this part number reads:

• Honda Odyssey 5th generation (from 2013)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Also have the fault memory read out before removal: only this record 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-THR-X020-M2 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, and only afterwards remove the control unit 77960-THR-X020-M2. Next, create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components and runs a function test. Stored crash data is also erased in the process. Processing usually takes 3–4 working days.

After the function test, your own unit goes back 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-X020-M2 get to Airbag24?

You send the control unit 77960-THR-X020-M2 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, your own unit comes back to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-proof.