Airbag control unit with part number 77960-T0A-J020-M4

What does the airbag control unit 77960-T0A-J020-M4 do?

The airbag control unit 77960-T0A-J020-M4 is the central control unit of the SRS for Honda. It evaluates the crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit reports faults via the airbag warning light. This makes the state of the system visible to you in the vehicle at all times.

After an accident, it stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit 77960-T0A-J020-M4 fail?

The most common cause on the 77960-T0A-J020-M4 is crash data stored after an accident, even when no airbag has deployed. This data cannot be erased with a normal diagnostic tool.

Several other causes are also possible, which relate to age, environment and power supply:

• aged electronic components
• moisture and corrosion at plug connectors
• cold solder joints
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 77960-T0A-J020-M4 is defective?

A defect on the 77960-T0A-J020-M4 shows up first in the airbag warning light, which lights up permanently or intermittently. In addition, error messages appear in the instrument cluster, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

These signs are clear enough to start the check:

• Airbag warning light lights up permanently or intermittently
• Error message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

In an emergency, the airbags and seatbelt pretensioners may then fail to trigger.

Which vehicles is the 77960-T0A-J020-M4 fitted in?

The control unit 77960-T0A-J020-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The vehicles in detail:

• Honda CR-V 4 RM (2012-2018)

Compare the part number on the label of the removed unit with this page; this only ensures that it is the correct unit. Have the fault memory read out beforehand. Only that log 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 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-T1G-G920-M4.

How does the repair of the 77960-T0A-J020-M4 work?

In this order: for the 77960-T0A-J020-M4, have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Afterwards create a repair order online and send the unit in well packed. At Airbag24, checking, repairing and function testing usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components and erases the stored crash data. A function test follows, and your own unit is returned 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-J020-M4 get to Airbag24?

You send the control unit 77960-T0A-J020-M4 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

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