Airbag control unit with part number 77960-TV0-E020-M4

What does the airbag control unit 77960-TV0-E020-M4 do?

The airbag control unit 77960-TV0-E020-M4 coordinates the restraint system (SRS) of Honda. It reads the crash sensors, determines in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system permanently. It reports a detected fault via the airbag warning light.

After an accident, the control unit stores crash data and locks itself. The sensors supply their values continuously for this.

Without this evaluation, the restraint system could not respond in the intended way in an emergency.

Why does the control unit 77960-TV0-E020-M4 fail?

The most common cause is the crash data left by an accident, even if no airbag was triggered. In addition come aged electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes, such as from a weak battery or a jump start.

Crash data cannot be erased by normal means. The repair at Airbag24 therefore also includes removing this data.

The other causes act over time or through external influences. Components age, solder joints go cold, and moisture attacks contacts, so malfunctions can occur.

How can you tell that the 77960-TV0-E020-M4 is defective?

A defect manifests itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Accompanying this 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 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 controls it. If it stays on, have it checked promptly.

Which vehicles is the 77960-TV0-E020-M4 fitted in?

The control unit 77960-TV0-E020-M4 is fitted in these vehicles: Honda Civic 9th generation (2011-2017). If your vehicle is not among them, check the part number on the removed unit.

The list summarises the vehicles that match our assignment to this number.

• Honda Civic 9th generation (2011-2017)

The label comparison is only a safeguard that the correct unit is present. Whether the control unit is defective or a plug or cable is the cause is answered only by a fault memory read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-TS4-U411-M1, 77960-TS4-U811-M2, 77960-TS4-Z611-M1, 77960-TS6-H711-M1, 77960-TT0-T011-M1, 77960-TT0-Y610-M2.

How does the repair of the 77960-TV0-E020-M4 work?

The fault memory is read out first, then you disconnect the battery and only afterwards remove the control unit. Then you create a repair order online and send the unit off well packed. At Airbag24, processing usually takes 3–4 working days.

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

Airbag24 checks the unit on the test bench, repairs defective components, removes the stored crash data and tests the function before your own unit is returned.

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-TV0-E020-M4 get to Airbag24?

You dispatch the control unit as a package, or for an extra charge you commission a UPS collection. After the repair, Airbag24 brings the unit back to you by UPS.

Place the printed repair order in the box and pack the control unit shockproof.