Airbag control unit with part number 77960-TLA-X030-M4

What does the airbag control unit 77960-TLA-X030-M4 do?

The airbag control unit 77960-TLA-X030-M4 manages the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors, determines in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

It works in the background and reports faults via the airbag warning light in the instrument cluster.

The lock after a crash is lifted only by the repair.

Why does the control unit 77960-TLA-X030-M4 fail?

The most common cause in the 77960-TLA-X030-M4 is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot remove this data; Airbag24 takes care of it during the repair. Further causes are aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data sits inside the unit, so erasing it on the car leads nowhere.

For the other causes the following applies:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from jump-starting

Which of these applies is shown only by the test on the test bench.

How can you tell that the 77960-TLA-X030-M4 is defective?

The airbag warning light in the instrument cluster lights up on the 77960-TLA-X030-M4 permanently or intermittently. Added to this are an error message in the instrument cluster, a diagnostic tool without connection to the control unit and a fault memory that cannot be cleared.

This light is a clear signal that the restraint system needs attention.

In an emergency, airbags and seatbelt pretensioners may not be triggered while the defect persists. The drive itself can feel completely normal.

Which vehicles is the 77960-TLA-X030-M4 fitted in?

This control unit (77960-TLA-X030-M4) is fitted in these vehicles: Honda CR-V 5 (2018-2023). The list is tied to the part number.

The assignment can be seen in this overview:

• Honda CR-V 5 (2018-2023)

First compare the part number on the label of the removed unit with this page; that only establishes the identity of the unit. Have the fault memory read out beforehand: only the 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-X030-M4 work?

For the 77960-TLA-X030-M4, first have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Afterwards pack the unit well and send it in. At Airbag24, checking, repairing and testing usually take 3–4 working days.

The test bench check reveals faults, the repair corrects them, the crash data is deleted and a function test concludes the process. Afterwards the 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-TLA-X030-M4 get to Airbag24?

You send the control unit 77960-TLA-X030-M4 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

The printed repair order belongs in the parcel, and the unit needs shock-proof packaging.