Airbag control unit with part number 77960-TLA-R020-M4

What does the airbag control unit 77960-TLA-R020-M4 do?

The airbag control unit 77960-TLA-R020-M4 controls the restraint system (SRS) of Honda. It measures via the crash sensors whether an accident has occurred and decides within milliseconds which airbags and seatbelt pretensioners are triggered.

The control unit monitors the entire system continuously. If it detects a fault, the airbag warning light comes on. After an accident the unit stores crash data and locks itself.

Why does the control unit 77960-TLA-R020-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. In the 77960-TLA-R020-M4, aged components, cold solder joints, moisture and voltage spikes are also possible causes.

Crash data cannot be removed with usual diagnostic tools. Airbag24 clears it during the repair, and only then is the unit ready for the examination of the other components. In addition, these causes are possible:

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

How can you tell that the 77960-TLA-R020-M4 is defective?

The airbag warning light in the instrument cluster lights up either continuously or only intermittently. Other signs include a fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

With such signs, airbags and seatbelt pretensioners may not deploy in an emergency. The warning light is therefore not a cosmetic issue but a warning signal for the entire restraint system, and it must be taken seriously.

Which vehicles is the 77960-TLA-R020-M4 fitted in?

The 77960-TLA-R020-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

The known vehicles for this part number are listed below.

• Honda CR-V 5 (2018-2023)

Comparing the part number on the label of the removed unit with this page only confirms that it is the correct unit. Also have the fault memory read out before removal, because only this 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 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-SWAA-213-M1.

How does the repair of the 77960-TLA-R020-M4 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery, remove the 77960-TLA-R020-M4 and finally create a repair order online and send the unit in.

Airbag24 checks the control unit on the test bench and replaces defective components. Stored crash data is deleted, and a function test follows. For checking, repairing and testing at Airbag24, 3–4 working days are usually scheduled before your own unit is returned.

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-TLA-R020-M4 get to Airbag24?

For the route to Airbag24 you can use parcel shipping or a UPS collection booked for an extra charge. Airbag24 returns the repaired unit to you by UPS.

The parcel contains the printed repair order and shock-proof protection for the control unit.