Airbag control unit with part number 77960-T00-T620-M2

What does the airbag control unit 77960-T00-T620-M2 do?

The airbag control unit 77960-T00-T620-M2 is the control unit of the restraint system (SRS) in vehicles of Honda. It evaluates the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It signals faults via the airbag warning light.

During normal operation, the unit works in the background without any irregularities.

After a crash, it stores crash data and locks itself.

Why does the control unit 77960-T00-T620-M2 fail?

At 77960-T00-T620-M2, crash data from an accident is the most common cause, even if no airbag was triggered. An ordinary diagnostic tool cannot remove this data. The other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data stays in the memory until Airbag24 erases it as part of the repair.

Ageing electronic components and cold solder joints can cause faults that make themselves felt gradually.

Moisture and corrosion at the plug connections disrupt signal transmission, and voltage spikes, for example from a weak battery or a jump start, put strain on the electronics.

How can you tell that the 77960-T00-T620-M2 is defective?

The airbag warning light lights up constantly or intermittently at 77960-T00-T620-M2. In addition, an error message appears in the instrument cluster, or the diagnostic tool finds no connection to the control unit. The fault memory also cannot be cleared.

A finding of this kind affects the restraint system as a whole, not just a secondary function.

In an emergency, airbags and seatbelt pretensioners may not be able to deploy while the fault is present. The warning light should therefore be checked promptly.

Which vehicles is the 77960-T00-T620-M2 fitted in?

For 77960-T00-T620-M2, the part number is decisive, less the model designation. The control unit 77960-T00-T620-M2 is fitted in these vehicles: Honda City 6th generation (2008-2013).

Here is the assignment:

• Honda City 6th generation (2008-2013)

Compare the part number on the label of the removed unit with this page to confirm that it is the right unit. Have the fault memory read out beforehand, because only its content 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 77810-T9DT81ZA, 77960-T00-Y810-M2.

How does the repair of the 77960-T00-T620-M2 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. At Airbag24, checking, repairing and testing take 3–4 working days as a rule.

You create the repair order online, and you send the well-packed unit in. The sequence protects the work on the restraint system.

At Airbag24, the unit goes on the test bench, defective components are repaired and the crash data is removed. A function test follows before your own unit is sent back.

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-T00-T620-M2 get to Airbag24?

You can send the control unit 77960-T00-T620-M2 in as a parcel or have it collected by UPS for an extra charge. Airbag24 sends it back to you by UPS after the repair.

Put the printed repair order into the parcel and pack the unit shock-proof.