Airbag control unit with part number 77960-TY3-J320-M1

What does the airbag control unit 77960-TY3-J320-M1 do?

In vehicles from Honda, the airbag control unit 77960-TY3-J320-M1 works as the central control unit of the restraint system (SRS). It evaluates the crash sensors, selects within milliseconds which airbags and seatbelt pretensioners to trigger in a crash, and keeps an eye on the system. After an accident it stores crash data and locks itself.

Monitoring runs constantly. If the unit finds a deviation, it indicates this via the airbag warning light.

Why does the control unit 77960-TY3-J320-M1 fail?

The most common cause is stored crash data after an accident, even if no airbag was triggered. Other causes include aged components, dry solder joints, moisture and corrosion at plugs, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 takes care of that during the repair.

Over time the electronics age, solder joints can stay cold, and moisture corrodes plug connections. Voltage spikes arise, for example, from a weak battery or a jump start.

How can you tell that the 77960-TY3-J320-M1 is defective?

Typical signs are an airbag warning light that stays on permanently or intermittently, error messages in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Pay particular attention to these signs:

• The warning light stays on or lights up intermittently.
• The instrument cluster shows error messages.
• The diagnostic tool cannot find the control unit.
• The fault memory remains despite an attempt to clear it.

Take such signs seriously. A fault can only be narrowed down clearly by reading out the fault memory.

Which vehicles is the 77960-TY3-J320-M1 fitted in?

In these vehicles the control unit 77960-TY3-J320-M1 is fitted: Honda Legend 5th generation (2014-2021).

The vehicles that Airbag24 assigns to this part number are listed below.

• Honda Legend 5th generation (2014-2021)

Compare the part number on the label of the removed unit with this page, ideally before the unit is dispatched. This only confirms the assignment. The cause is shown by the fault memory, which you should have read out beforehand, because a plug or a cable can also trigger the fault.

How does the repair of the 77960-TY3-J320-M1 work?

First read out the fault memory and enclose the record. Then disconnect the battery and only afterwards remove the control unit. Next create a repair order online and send the unit off securely packed.

Airbag24 examines the unit on the test bench. The repair comprises replacing defective components, clearing the stored crash data and a function test. After the test, your own unit goes back to you. Processing usually takes 3–4 working days.

The order of steps is fixed, because working on the airbag system calls for caution. 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-TY3-J320-M1 get to Airbag24?

You either send the parcel yourself, or you book a UPS collection for an extra charge. After the repair, UPS brings the unit back to you.

Enclose the printed repair order with the parcel and pad the unit shock-proof.