Airbag control unit with part number 77960-TL4-B911-M1

What does the airbag control unit 77960-TL4-B911-M1 do?

The airbag control unit 77960-TL4-B911-M1 is the central control unit of the SRS in Honda. It processes the signals from the crash sensors, decides in a crash within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously.

The control unit reports faults via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself. The next section describes the consequences for fault finding.

Why does the control unit 77960-TL4-B911-M1 fail?

For the 77960-TL4-B911-M1, the most common cause is crash data stored after an accident, regardless of whether an airbag fired. A standard diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also involved.

The electronics age, and cold solder joints can cause contact problems. Moisture and corrosion attack plug connections.

Voltage spikes occur, for example, with a weak battery or when jump-starting, and place additional strain on the unit.

How can you tell that the 77960-TL4-B911-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently when the system has detected a fault on the 77960-TL4-B911-M1. Accompanying this, an error message appears, the diagnostic tool finds no connection, and the fault memory cannot be cleared.

With such a finding, airbags and seatbelt pretensioners may not trigger in an emergency. Have the condition checked promptly.

The light is the vehicle's direct indication of a defect.

Which vehicles is the 77960-TL4-B911-M1 fitted in?

The control unit 77960-TL4-B911-M1 is fitted in these vehicles: Honda Accord 8th generation (2008-2015). You recognise whether it matches your car by make and model.

The vehicles at a glance:

• Honda Accord 8th generation (2008-2015)

A comparison of the part number on the label of the removed unit with this page ensures that it is the right unit. Whether the control unit is defective or a plug or cable causes the fault is shown only by reading out the fault memory. Therefore, have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 77960-TA0-A01, 77960-TA0-A011M4, 77960-TA0-A02, 77960-TA0-A020-M4, 77960-TA0-A040-M4, 77960-TA0-A202-M4.

How does the repair of the 77960-TL4-B911-M1 work?

First have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit 77960-TL4-B911-M1, create a repair order online and send the well-packed unit in.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, your own unit comes back to you.

At Airbag24, checking, repairing and testing usually take 3–4 working days.

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-TL4-B911-M1 get to Airbag24?

You send the 77960-TL4-B911-M1 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Print the repair order and put it in the parcel. Pack the unit shockproof.