Airbag control unit with part number 77960-TLA-E220-M4

What does the airbag control unit 77960-TLA-E220-M4 do?

The 77960-TLA-E220-M4 is the airbag control unit of the restraint system for Honda. It processes the signals from the crash sensors, determines in a crash within milliseconds which airbags and seatbelt pretensioners are triggered, and monitors the system without pause.

Monitoring runs in the background throughout the entire journey. If the control unit detects a fault, it stores it and shows it via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and then locks itself.

Why does the control unit 77960-TLA-E220-M4 fail?

For the 77960-TLA-E220-M4, the most common cause is crash data stored after an accident, even if no airbag has deployed. Beyond that, aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or jump-starting come into consideration.

Crash data remains stored because a standard diagnostic tool cannot remove it. For this reason the fault persists even after reading out. Airbag24 clears the crash data during the repair.

The other causes mainly concern the age and environment of the control unit. Electronic components change over time, solder joints can stay cold, and moisture causes plug contacts to corrode. Only the fault memory shows which of these causes actually applies.

How can you tell that the 77960-TLA-E220-M4 is defective?

A defect in the 77960-TLA-E220-M4 shows up through the airbag warning light in the instrument cluster, which stays on permanently or intermittently, through an error message there, through a diagnostic tool without connection to the control unit, or through a fault memory that cannot be cleared.

The warning light is the most important indication, because it reports every detected fault. If an error message also appears in the instrument cluster, the fault is clearly identifiable. If the connection to the control unit is missing, the diagnostic tool cannot retrieve any data.

In such cases airbags and seatbelt pretensioners may fail to deploy in an emergency. Therefore have the finding checked promptly.

Which vehicles is the 77960-TLA-E220-M4 fitted in?

The 77960-TLA-E220-M4 is fitted in these vehicles: Honda CR-V 5 (2018-2023).

The list shows the vehicles that Airbag24 assigns to this part number.

• Honda CR-V 5 (2018-2023)

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit. It does not clarify a cause. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or cable is causing the problem.

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-E220-M4 work?

You have the fault memory of the 77960-TLA-E220-M4 read out and enclose the log. Then disconnect the battery, remove the control unit, create a repair order online and send in the well-packed unit.

This order is for your safety, because the control unit may only be removed once the battery is disconnected. At Airbag24 the unit is first examined on the test bench, defective components are replaced, stored crash data is cleared and a function test is carried out.

Airbag24 usually allows 3–4 working days for inspecting, repairing and testing. Afterwards your own unit is returned 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-E220-M4 get to Airbag24?

You send the control unit 77960-TLA-E220-M4 in as a package, or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order goes in the package, and you pack the unit shock-proof.