Airbag control unit with part number 77960-TLA-Y620-M4

What does the airbag control unit 77960-TLA-Y620-M4 do?

The 77960-TLA-Y620-M4 is the control unit that controls the restraint system (SRS) in Honda. It measures via the crash sensors whether an accident has occurred and, in an emergency, triggers the appropriate airbags and seatbelt pretensioners within milliseconds. It shows detected faults via the airbag warning light.

This includes continuous monitoring of the entire system. While the vehicle is being driven, the control unit checks sensors, triggers and wiring.

If an accident occurs, the unit creates crash data and locks itself.

Why does the control unit 77960-TLA-Y620-M4 fail?

Failures of the 77960-TLA-Y620-M4 are mainly due to crash data that remain stored after an accident, even if no airbag has fired. A normal diagnostic tool cannot remove this data; Airbag24 erases it during the repair.

That no airbag fired does not mean that nothing was stored. The control unit records the event, and the data remain in the unit.

Other possible causes are aging components in the electronics, poorly soldered joints, moisture or rust on the plugs, and voltage spikes, for example from a weak battery.

Which of these causes applies to your unit is shown by the test. A guess alone is not enough for that.

How can you tell that the 77960-TLA-Y620-M4 is defective?

A defect on the 77960-TLA-Y620-M4 can be recognised by the airbag warning light in the instrument cluster staying on permanently or intermittently. Error messages in the instrument cluster, a disturbed connection to the diagnostic tool and a fault memory that cannot be cleared also point to it. In an emergency, airbags and seatbelt pretensioners may then be unable to trigger.

Checking these signs individually helps little; what matters is the overall picture:

• The warning light stays on permanently or keeps coming back on.
• An error message for the airbag system appears in the instrument cluster.
• The diagnostic tool does not find the control unit.
• The fault memory stays full even after an attempt to clear it.

Have such signs checked rather than ignoring them.

Which vehicles is the 77960-TLA-Y620-M4 fitted in?

This 77960-TLA-Y620-M4 is found in these vehicles: Honda CR-V 5 (2018-2023).

Below follows the list of the vehicles on record for this part number.

• Honda CR-V 5 (2018-2023)

First read out the fault memory, so it is clear whether the control unit is actually defective or whether a plug or a cable is the cause. Then compare the number on the label of the removed unit with this page.

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-Y620-M4 work?

Before removal you read out the fault memory and enclose the log; then you remove the 77960-TLA-Y620-M4 and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Disconnect the battery before removal so that the work on the vehicle stays safe.

At Airbag24 the unit is checked, defective components are replaced, the crash data are erased and finally a function test is carried out. Then your own unit goes back to you. The stated time applies only to this work.

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-Y620-M4 get to Airbag24?

Either you send the control unit 77960-TLA-Y620-M4 as a parcel, or you arrange a collection by UPS for an extra charge. The return after the repair is also made by UPS.

The printed repair order goes into the parcel; the unit should be packed shockproof.