Airbag control unit with part number 77960-TLA-H030-M4

What does the airbag control unit 77960-TLA-H030-M4 do?

The airbag control unit 77960-TLA-H030-M4 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

During operation the control unit monitors the entire system continuously, that is the wiring and the connected components. The warning light in the instrument cluster shows you the condition of the system, so that you can notice a fault early.

After an accident the unit stores crash data and locks itself. The evaluation of this data is carried out afterwards only by the workshop that repairs the unit.

Why does the control unit 77960-TLA-H030-M4 fail?

Most often the cause lies in stored crash data, even if no airbag was triggered. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage peaks, for example from a weak battery or a jump start.

A normal diagnostic tool cannot erase the crash data. For this reason the fault does not disappear even after a simple reset.

The other causes concern solder joints, plugs and components that are hard to judge from the outside. This is why only the evaluation of the fault memory provides reliable clues to the actual cause.

Voltage peaks arise, for example, when the battery is weakened or a jump start is carried out improperly.

How can you tell that the 77960-TLA-H030-M4 is defective?

A defect shows up at the airbag warning light, in fault messages in the instrument cluster, in a missing connection to the diagnostic tool, or in a fault memory that cannot be cleared. The control unit therefore reports such findings itself.

• The airbag warning light in the instrument cluster lights up continuously or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool finds no connection to the control unit.
• The fault memory cannot be cleared.

With such a finding, airbags and seatbelt pretensioners may possibly not trigger in an emergency. Do not ignore the warning, and have the cause clarified promptly.

Which vehicles is the 77960-TLA-H030-M4 fitted in?

The control unit 77960-TLA-H030-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

The vehicle assignment in detail:

• Honda CR-V 5 (2018-2023)

Compare the part number on the label of the removed unit with this page. This way you can only make sure that you have the correct unit in front of you. Also have the fault memory read out before removal, because this 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-SWAA-213-M1.

How does the repair of the 77960-TLA-H030-M4 work?

First have the fault memory read out and enclose the log; then disconnect the battery and remove the control unit 77960-TLA-H030-M4. Afterwards create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days for testing, repair and check, as a rule.

The sequence is binding, because the battery must be disconnected before removal. Removal follows last.

Airbag24 checks the unit on the test bench, replaces defective components and erases stored crash data. A function test then completes the work, and your own 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-H030-M4 get to Airbag24?

You send the control unit as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair Airbag24 returns your own unit to you by UPS.

Enclose the printed repair order and pack the unit shockproof.