Airbag control unit with part number 77960-TL0-B920-M1

What does the airbag control unit 77960-TL0-B920-M1 do?

The airbag control unit 77960-TL0-B920-M1 coordinates the restraint system (SRS) of Honda. It processes the measured values from the crash sensors, decides in the event of an impact within fractions of a second which airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

In the background, the unit continuously checks its connections and the connected components. This way a fault is noticed as soon as it occurs and can later be traced in the fault memory.

After an accident the control unit writes crash data and locks itself. This data is the starting point for every later check of the unit.

Why does the control unit 77960-TL0-B920-M1 fail?

The most common cause is crash data that remains stored in the unit after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture or corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump start, are also possible.

A unit without an accident event can fail as well, for example through ageing of the electronics or through connection problems.

Which cause applies in the individual case only becomes clear from the readout of the fault memory, together with the check of the unit.

How can you tell that the 77960-TL0-B920-M1 is defective?

When the airbag warning light in the instrument cluster comes on, either permanently or only intermittently, this is a warning sign. An error message in the instrument cluster, a missing contact to the diagnostic tool or a fault memory that cannot be emptied also belong to this. In such cases, airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light is a warning signal and not a cosmetic fault that can be ignored. It shows the defect directly and requires a prompt check.

Which cause lies behind it remains open at first and only becomes apparent during the readout.

Which vehicles is the 77960-TL0-B920-M1 fitted in?

A 77960-TL0-B920-M1 control unit belongs to Honda. It is fitted in these vehicles: Honda Accord 8th generation (2008-2015).

The assignment of vehicles is shown in this overview:

• Honda Accord 8th generation (2008-2015)

Compare the part number on the label of the removed unit with this page. This only establishes that you have the right unit. Have the fault memory read out beforehand, because only the protocol shows whether the control unit is defective or a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-S84-A86, 77960-TA0-A01, 77960-TA0-A011M4, 77960-TA0-A02, 77960-TA0-L02.

How does the repair of the 77960-TL0-B920-M1 work?

First have the fault memory read out and enclose the protocol. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and pack the unit well before sending it in.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. After the test, your own unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This time covers only checking, repairing and testing.

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-TL0-B920-M1 get to Airbag24?

You either send the unit as a parcel, or you 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. Pack the unit shock-proof so that it arrives undamaged.