Airbag control unit with part number 77960-T00-Z620-M2

What does the airbag control unit 77960-T00-Z620-M2 do?

The airbag control unit 77960-T00-Z620-M2 is the central control unit of the restraint system (SRS) of Honda. It evaluates the signals of the crash sensors, decides in a crash within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After a crash it stores crash data and locks itself.

The unit signals detected faults via the airbag warning light in the instrument cluster.

In the background it constantly checks whether sensors, wiring and actuators deliver plausible values.

Why does the control unit 77960-T00-Z620-M2 fail?

Most often the cause is crash data that was stored after an accident, even if no airbag was triggered; normal diagnostic tools cannot erase it. In addition there are aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage peaks.

Crash data can be read out, but it cannot be removed with common tools. Airbag24 erases it as part of the repair.

The further triggers at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage peaks from the on-board electrical system, for example with a weak battery or a jump start

How can you tell that the 77960-T00-Z620-M2 is defective?

The airbag warning light lights up constantly or intermittently, a fault message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, or the fault memory cannot be cleared. In such a case the airbags and seatbelt pretensioners may fail to trigger in a crash.

If the warning light does not come on after the ignition is switched on, or stays on afterwards, you should have the restraint system checked promptly.

The unit reports the fault itself, so the notice in the instrument cluster is the most important indication.

Which vehicles is the 77960-T00-Z620-M2 fitted in?

The airbag control unit 77960-T00-Z620-M2 is fitted in these vehicles: Honda City 6th generation (2008-2013).

The assignment at a glance:

• Honda City 6th generation (2008-2013)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Also have the fault memory read out beforehand, because the result 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-Z620-M2 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Next create a repair order online and send the unit in well packed. Airbag24 checks it, replaces defective components, erases crash data and tests the function; processing usually takes 3–4 working days.

The battery must be disconnected before removal, because otherwise the airbag system is not de-energised.

At Airbag24 the unit is first examined on the test bench. Afterwards 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-T00-Z620-M2 get to Airbag24?

You send the unit to Airbag24 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 in the parcel.

Pack the unit shock-resistant so that it arrives undamaged.