Airbag control unit with part number 77960-T5C-J820-M1

What does the airbag control unit 77960-T5C-J820-M1 do?

The airbag control unit 77960-T5C-J820-M1 is the central hub of the SRS restraint system of Honda. In an impact it evaluates the crash sensors, decides within a very short time whether to fire the airbags and seatbelt pretensioners, and monitors the entire system during operation.

If the unit detects a fault, it reports it via the airbag warning light. After an accident, it stores crash data and locks itself.

Because the evaluation decides on deployment in an emergency, it must work reliably at all times.

Why does the control unit 77960-T5C-J820-M1 fail?

For the 77960-T5C-J820-M1, the most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Other causes at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair.

How can you tell that the 77960-T5C-J820-M1 is defective?

A defect on the 77960-T5C-J820-M1 shows up as the airbag warning light staying on permanently or intermittently, and as an error message in the instrument cluster. A diagnostic tool without a connection to the control unit, or a fault memory that cannot be cleared, also indicates a problem.

The signs at a glance:

• Airbag warning light on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool has no connection to the control unit
• Fault memory cannot be cleared

In the event of such a defect, the airbags and seatbelt pretensioners may not deploy in an emergency. Therefore have the cause clarified promptly.

Which vehicles is the 77960-T5C-J820-M1 fitted in?

The 77960-T5C-J820-M1 is fitted in these vehicles: Honda Jazz GK (2013-2023).

The vehicles in detail:

• Honda Jazz GK (2013-2023)

Checking the part number on the unit's label against this page only confirms that it is the correct unit. Have the fault memory read out beforehand. Only that 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 77960-T5A-A212-M1, 77960-T5A-E010-M1, 77960-T5A-E011-M1, 77960-T5A-E020-M1, 77960-T5A-F010-M1, 77960-T5A-F011-M1.

How does the repair of the 77960-T5C-J820-M1 work?

For the 77960-T5C-J820-M1, first have the fault memory read out and attach the log. Then disconnect the battery; only after that is the control unit removed. Next, create a repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Your own unit is then 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-T5C-J820-M1 get to Airbag24?

You send the 77960-T5C-J820-M1 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS. Put the printed repair order into the parcel.

Pack the unit securely against impact so that it suffers no damage in transit.