Airbag control unit with part number 77960-T00-Z820-M2

What does the airbag control unit 77960-T00-Z820-M2 do?

The airbag control unit 77960-T00-Z820-M2 coordinates the restraint system (SRS) in vehicles of Honda. Within milliseconds it calculates from the measured values of the crash sensors whether airbags and seatbelt pretensioners must deploy.

At the same time it checks the entire system in the background and reports faults via the airbag warning light. After a crash it stores crash data and is then locked; this lock is released only by the repair.

Why does the control unit 77960-T00-Z820-M2 fail?

Most often the cause is crash data stored after a crash, even if no airbag has deployed. A standard diagnostic tool cannot erase this data. Other causes are aged components, cold solder joints, moisture or corrosion at connectors and voltage spikes.

Electronic components age over time, and this process affects the reliability of the circuit. Cold solder joints can cause contact problems, while moisture and corrosion attack connectors.

Voltage spikes, for example from a weak battery or a jump-start, place additional strain on the electronics. Which of these causes applies to your unit is shown only by the readout of the fault memory.

How can you tell that the 77960-T00-Z820-M2 is defective?

A defect in the 77960-T00-Z820-M2 shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and through fault messages in the instrument cluster. In addition, the diagnostic tool cannot reach the control unit and the fault memory cannot be cleared.

Typical signs at a glance:

• airbag warning light lit permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool cannot reach the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not deploy. If you notice any of these signs, have the vehicle checked promptly.

Which vehicles is the 77960-T00-Z820-M2 fitted in?

The control unit 77960-T00-Z820-M2 is fitted in vehicles of Honda: Honda City 6th generation (2008-2013). Whether your vehicle is among them, check against the list on this page.

These vehicles are recorded for this unit:

• Honda City 6th generation (2008-2013)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Have the fault memory read out beforehand, because only that result shows whether the control unit is defective or whether a plug or 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-Z820-M2 work?

Before removal you have the fault memory read out and attach the log to the unit, then you disconnect the battery. Only after that you remove the control unit 77960-T00-Z820-M2, create the repair order online and pack the unit well. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data is erased, and a functional test follows. 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-Z820-M2 get to Airbag24?

You send in the control unit 77960-T00-Z820-M2 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends your unit back to you by UPS.

The printed repair order goes into the box, and the unit must be packed shock-proof.