Airbag control unit with part number 77960-TLA-L240-M4

What does the airbag control unit 77960-TLA-L240-M4 do?

In Honda vehicles, the airbag control unit 77960-TLA-L240-M4 is the switching point of the restraint system (SRS). It evaluates the crash sensors and decides within milliseconds, in the event of an accident, which airbags and seatbelt pretensioners are triggered. After an accident, it stores crash data and locks itself.

It monitors the system continuously and reports faults via the airbag warning light in the instrument cluster.

The stored data includes fault entries as well as the crash data from an event.

Why does the control unit 77960-TLA-L240-M4 fail?

The most common cause is crash data that remains in the unit after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are generally ageing, cold solder joints, moisture and voltage spikes.

Airbag24 removes the crash data as part of the repair.

Other causes in detail:

• Aged electronic components
• Cold solder joints on the circuit board
• Moisture and corrosion at plug connections
• Voltage spikes from a weak battery or jump-starting

How can you tell that the 77960-TLA-L240-M4 is defective?

Signs of a fault are an airbag warning light that stays on permanently or intermittently, an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

• Airbag warning light stays on permanently
• Airbag warning light comes on intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection
• Fault memory cannot be cleared

Do not ignore these indications. Have the fault memory read out before taking any further steps.

Which vehicles is the 77960-TLA-L240-M4 fitted in?

The 77960-TLA-L240-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023). This information is based on the data Airbag24 holds for this unit.

The vehicles are listed below:

• Honda CR-V 5 (2018-2023)

Matching the part number on the label with this page only confirms that you have the right unit. It does not confirm a fault. Before you do anything else, have the fault memory read out, as only this shows whether the control unit 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-L240-M4 work?

First, read out the fault memory and enclose the log. Then disconnect the battery, remove the control unit, create a repair order online and send the well-packed unit in.

Airbag24 checks the unit on the test bench and replaces defective components. Airbag24 then erases the stored crash data and runs a function test, after which the unit is returned to you.

Processing at Airbag24 usually takes 3–4 working days, and this period covers only testing, repair and function testing. 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-L240-M4 get to Airbag24?

You send the unit to us as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns it to you by UPS after the repair.

The printed repair order goes into the parcel, and the unit must be packed shock-proof.