Airbag control unit with part number 77960-TLA-Z040-M4

What does the airbag control unit 77960-TLA-Z040-M4 do?

The airbag control unit 77960-TLA-Z040-M4 is the central control unit of the restraint system (SRS) for vehicles of the Honda brand. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds on the triggering of the airbags and seatbelt pretensioners.

The control unit monitors the system constantly, so that faults are noticed early. It indicates faults via the airbag warning light. After an accident, it stores the crash data and is locked afterwards.

Why does the control unit 77960-TLA-Z040-M4 fail?

For this control unit 77960-TLA-Z040-M4, the most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. In addition, ageing components, cold solder joints, moisture and corrosion, and voltage spikes come into question.

The crash data means that the fault memory stays filled even after it has been read out.

Ageing electronic components gradually lose stability. Cold solder joints, moisture and corrosion at plugs, and voltage spikes from the vehicle electrical system can lead to faults.

How can you tell that the 77960-TLA-Z040-M4 is defective?

A defect at the 77960-TLA-Z040-M4 is indicated by the airbag warning light, which stays on permanently or intermittently in the instrument cluster. In addition, an error message appears in the instrument cluster, and the diagnostic tool receives no connection to the control unit.

A fault memory that cannot be cleared also points to a problem in the system. In that case, airbags and seatbelt pretensioners may not be able to trigger in an emergency.

The warning light is therefore the most important sign. As soon as it comes on, have the vehicle checked promptly rather than waiting.

Which vehicles is the 77960-TLA-Z040-M4 fitted in?

The control unit 77960-TLA-Z040-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

The following vehicles are recorded for this part number:

• Honda CR-V 5 (2018-2023)

Compare the part number on the label of the removed unit with this page, so that you have the right unit. Then have the fault memory read out. 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-Z040-M4 work?

Airbag24 needs 3–4 working days for processing. Beforehand, you read out the fault memory and enclose the log. Then you disconnect the battery, remove the control unit and create a repair order online.

Afterwards, you pack the unit and send it in. Airbag24 checks it on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Then the unit goes back to you. The 3–4 working days refer exclusively to the work at Airbag24. 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-Z040-M4 get to Airbag24?

You send the control unit 77960-TLA-Z040-M4 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order in the parcel. Pack the unit shock-proof.