Airbag control unit with part number 77960-TA0-X020-M4

What does the airbag control unit 77960-TA0-X020-M4 do?

The 77960-TA0-X020-M4 is the airbag control unit of the restraint system (SRS) for Honda. It evaluates the crash sensors and decides in an impact which airbags and seatbelt pretensioners fire.

The unit monitors the system continuously and shows faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 77960-TA0-X020-M4 fail?

The most common cause of the 77960-TA0-X020-M4 is crash data after an accident, even if no airbag triggered, because a normal diagnostic tool cannot erase them. Aged electronics, cold solder joints, moisture and voltage spikes are also possible causes.

Airbag24 erases crash data during the repair. The other causes can be summarised as follows:

• aged electronics
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes from a weak battery or a jump start

How can you tell that the 77960-TA0-X020-M4 is defective?

On the 77960-TA0-X020-M4, a defect shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through an error message, or when the diagnostic tool gets no contact. A fault memory that cannot be cleared is added.

• Airbag warning light permanently or intermittently on
• Error message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory cannot be cleared

If the system is disturbed, airbags and seatbelt pretensioners may possibly not trigger in an emergency. A prompt check is therefore advisable.

Which vehicles is the 77960-TA0-X020-M4 fitted in?

Whether the vehicle fits is something you check against the details on your vehicle registration document. The 77960-TA0-X020-M4 is intended for Honda and is fitted in these vehicles: Honda Accord 8th generation (2008-2015).

The vehicles at a glance:

• Honda Accord 8th generation (2008-2015)

Have the fault memory read out before removal, because the log shows whether the control unit itself is affected or whether a plug or cable is the cause. Then compare the part number on the label with this page. This comparison only confirms that it is the right unit.

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-X020-M4 work?

For the 77960-TA0-X020-M4, you have the fault memory read out and enclose the log. Then you disconnect the battery and only afterwards remove the unit. You create the repair order online, pack the control unit well and send it in.

Airbag24 checks it on the test bench, replaces defective components, removes the stored crash data and carries out a function test. Processing usually takes 3–4 working days. Afterwards your own unit goes back 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-TA0-X020-M4 get to Airbag24?

You send the 77960-TA0-X020-M4 to Airbag24 as a parcel or have it collected by UPS for an extra charge. The return after the repair is made by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-resistant.