Airbag control unit with part number 77960-T0A-P820-M4

What does the airbag control unit 77960-T0A-P820-M4 do?

The airbag control unit 77960-T0A-P820-M4 controls the SRS restraint system of Honda. It processes the signals from the crash sensors and decides within milliseconds after an impact which airbags and seatbelt pretensioners are triggered.

During operation, the unit checks the components of the system. Detected faults are indicated by the airbag warning light, so that you can see them.

After an accident, the control unit stores crash data and then locks itself, regardless of whether an airbag was triggered.

Why does the control unit 77960-T0A-P820-M4 fail?

On the 77960-T0A-P820-M4, the most common cause after an accident is stored crash data, even if no airbag was triggered. A standard diagnostic tool cannot remove this data.

Airbag24 erases the crash data as part of the repair. Other causes may be:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage peaks, for example from a weak battery or jump-starting

How can you tell that the 77960-T0A-P820-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears there. In addition, the diagnostic tool cannot address the 77960-T0A-P820-M4.

A fault memory that cannot be cleared is another indication. In the event of a defect, airbags and seatbelt pretensioners may not trigger in an emergency.

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory cannot be cleared

Which vehicles is the 77960-T0A-P820-M4 fitted in?

The control unit 77960-T0A-P820-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). It is worth a look at the list before removal.

Below you will find the assignment to the vehicles:

• Honda CR-V 4 RM (2012-2018)

Comparing the part number on the label of the removed unit with this page only ensures that it is the right unit. Having the fault memory read out shows, by contrast, 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 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-T1G-G920-M4.

How does the repair of the 77960-T0A-P820-M4 work?

First read out the fault memory and enclose the log. Then disconnect the battery and only then remove the control unit 77960-T0A-P820-M4. Afterwards create a repair order online and pack the unit well before sending it in.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and then carries out a functional test. Processing usually takes 3–4 working days at Airbag24. Afterwards your 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-T0A-P820-M4 get to Airbag24?

You send the control unit 77960-T0A-P820-M4 as a parcel to Airbag24, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof before it is on its way.