Airbag control unit with part number 77960-T0N-Z720-M3

What does the airbag control unit 77960-T0N-Z720-M3 do?

In the restraint system of Honda, the airbag control unit 77960-T0N-Z720-M3 takes over the evaluation. It processes the messages from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered. It also monitors the entire system and shows faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself.

In everyday use you notice none of this; meanwhile the unit checks whether all components are ready.

Why does the control unit 77960-T0N-Z720-M3 fail?

The most common cause is crash data from an earlier accident, even without a deployed airbag; a normal diagnostic tool cannot erase this data. Other possible causes are ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains stored in the unit until Airbag24 erases it during repair. Nothing from outside shows this.

The other causes mainly involve ageing and environmental influences, for example at the contacts of plug connections. A weak battery or a jump start can also cause voltage spikes.

How can you tell that the 77960-T0N-Z720-M3 is defective?

The airbag warning light in the instrument cluster stays on permanently or only intermittently. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

Such signs point to a defect that needs to be checked. Until then, the airbags and seatbelt pretensioners may not deploy in an emergency.

• Airbag warning light in the instrument cluster, permanently or intermittently on
• Fault message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory cannot be cleared

Which vehicles is the 77960-T0N-Z720-M3 fitted in?

The control unit 77960-T0N-Z720-M3 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). Check this list before removal to see whether your vehicle is included.

The vehicles for this number are listed here:

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page. This only confirms that you have the correct unit. Additionally, have the fault memory read out, because only this result 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-T0A-3070-M4, 77960-T0A-A012-M1, 77960-T0A-A013-M1, 77960-T0A-A210-M1, 77960-T0A-A212-M1, 77960-T0A-A230-M1.

How does the repair of the 77960-T0N-Z720-M3 work?

First have the fault memory read out and enclose the log, before you disconnect the battery and remove the control unit. Then create a repair order online and send the well-packed unit in. Airbag24 tests it on the test bench, repairs the defective components, erases the crash data and tests the result; this usually takes 3–4 working days.

This order is for your own safety when working on the vehicle.

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-T0N-Z720-M3 get to Airbag24?

You can send the unit as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 brings the unit back to you by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shockproof.