Airbag control unit with part number 77960-TA0-A020-M4

What does the airbag control unit 77960-TA0-A020-M4 do?

The airbag control unit 77960-TA0-A020-M4 controls the SRS restraint system in the Honda vehicle. It reads the signals from the crash sensors and determines in an accident which airbags and seatbelt pretensioners are triggered, a decision made within milliseconds.

The unit also monitors the entire system continuously. It reports faults via the airbag warning light. After a crash, it stores crash data and is locked afterwards.

Why does the control unit 77960-TA0-A020-M4 fail?

The most common cause is crash data stored on the control unit 77960-TA0-A020-M4 after an accident, even without an airbag having triggered. A normal diagnostic tool cannot erase this data. Other causes are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data means the diagnosis shows a fault despite intact electronics. That is why asking about an earlier accident is important during fault finding.

The other causes stem from ageing and environmental influences. Electronics age, solder joints can go cold, and moisture or corrosion at the plugs impair contact. Voltage spikes from a weak battery or a jump start can also disturb the unit.

How can you tell that the 77960-TA0-A020-M4 is defective?

A defect in the 77960-TA0-A020-M4 is indicated by the airbag warning light, which lights up permanently or intermittently. In addition, an error message appears in the instrument cluster, the diagnostic tool receives no connection and the fault memory cannot be cleared.

As long as these signs persist, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency. You should therefore have the vehicle checked promptly.

Which vehicles is the 77960-TA0-A020-M4 fitted in?

The control unit 77960-TA0-A020-M4 is fitted in these vehicles: Honda Accord 8th generation (2008-2015).

These vehicles are recorded for this part number:

• Honda Accord 8th generation (2008-2015)

Comparing the part number on the label with this page confirms that you have removed the right unit. You should have the fault memory read out beforehand, because only this log shows whether the control unit itself is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-S84-A86, 77960-TA0-A01, 77960-TA0-A011M4, 77960-TA0-A02, 77960-TA0-L02.

How does the repair of the 77960-TA0-A020-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Next create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. The unit then goes back to you. The time frame relates solely 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-TA0-A020-M4 get to Airbag24?

You send the control unit 77960-TA0-A020-M4 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

Enclose the printed repair order and pack the unit shockproof.