Airbag control unit with part number 77960-TL4-N911-M1

What does the airbag control unit 77960-TL4-N911-M1 do?

Within the restraint system (SRS) of Honda, the airbag control unit 77960-TL4-N911-M1 is the central point. It processes the signals from the crash sensors, decides in the event of an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and continuously monitors the system. It indicates faults via the airbag warning light.

The crash sensors deliver their readings to the unit, and evaluation takes place during operation. After an accident, it stores crash data and locks itself.

The control unit is thus the link between the sensors and the triggering of the restraint elements.

Why does the control unit 77960-TL4-N911-M1 fail?

Most often the unit fails because of crash data stored after an accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data remains stored until it is removed. A normal diagnostic tool cannot do this, which is why the fault does not disappear on its own. Airbag24 erases the data during the repair.

Aged components and cold solder joints alter the electrical behaviour. Moisture and corrosion disturb the contacts, and voltage spikes, for example from a weak battery or a jump start, place additional stress on the electronics.

How can you tell that the 77960-TL4-N911-M1 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Accompanying signs are a fault message in the instrument cluster, no connection between the diagnostic tool and the control unit, or a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The signs in detail:

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

The light is the direct indication, because the system itself drives it. A check is required as soon as it stays on.

Which vehicles is the 77960-TL4-N911-M1 fitted in?

The control unit 77960-TL4-N911-M1 is fitted in these vehicles: Honda Accord 8th generation (2008-2015). If your vehicle does not match, check the part number on the device first.

The list below contains the vehicles that belong to this part number.

• Honda Accord 8th generation (2008-2015)

Comparing the label with this page is only a safeguard that the correct unit is present. Having the fault memory read out beforehand 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-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-N911-M1 work?

First the fault memory is read out, then you disconnect the battery and only afterwards remove the control unit. Then you create a repair order online and send the carefully packed unit. Processing at Airbag24 usually takes 3–4 working days.

The fault memory log belongs in the package. The sequence is mandatory for safety reasons.

Inside the company, the unit is checked, defects are rectified, the crash data is removed, and a function test follows. Then your own unit is 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-TL4-N911-M1 get to Airbag24?

Either you send the unit as a package, or for an extra charge you book a UPS collection. After the repair, Airbag24 returns the unit to you by UPS.

The printed repair order belongs in the package. Pack the control unit shockproof.