Airbag control unit with part number 77960-TLA-Y020-M4

What does the airbag control unit 77960-TLA-Y020-M4 do?

The airbag control unit 77960-TLA-Y020-M4 is the central control unit of the restraint system (SRS) at Honda. It evaluates the signals from the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

The decision is made within milliseconds, and the unit monitors the system continuously. It reports faults via the airbag warning light.

After an accident it stores crash data and locks itself.

Why does the control unit 77960-TLA-Y020-M4 fail?

The most common cause with the 77960-TLA-Y020-M4 is that crash data remain stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase them, and other causes may also play a role.

Other causes at a glance:

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

Which cause applies only becomes clear once the unit has been examined.

How can you tell that the 77960-TLA-Y020-M4 is defective?

A defect in the 77960-TLA-Y020-M4 shows up as the airbag warning light, which lights up permanently or intermittently, and as fault messages in the instrument cluster. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

Typical signs are:

• airbag warning light in the instrument cluster
• fault message in the instrument cluster
• missing connection to the diagnostic tool
• fault memory cannot be cleared

Have these signs checked promptly.

Which vehicles is the 77960-TLA-Y020-M4 fitted in?

The control unit 77960-TLA-Y020-M4 is fitted at Honda in the following vehicles: Honda CR-V 5 (2018-2023).

The vehicles for this part number are listed below.

• Honda CR-V 5 (2018-2023)

Compare the part number on the label of the removed unit with this page; this only ensures that you have the right unit. Also have the fault memory read out beforehand, 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 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-SWAA-213-M1.

How does the repair of the 77960-TLA-Y020-M4 work?

First you read out the fault memory and attach the log. Then you disconnect the battery, remove the control unit 77960-TLA-Y020-M4, create a repair order online and send the unit in packed. Processing at Airbag24 generally takes 3–4 working days for testing, repairing and checking.

Airbag24 tests the unit on the test bench, repairs components where necessary, erases the crash data and carries out a function test. Your own unit then comes back.

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-Y020-M4 get to Airbag24?

You send the control unit 77960-TLA-Y020-M4 in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-proof.