Airbag control unit with part number 77960-SNA-X620-M1

What does the airbag control unit 77960-SNA-X620-M1 do?

In the Honda vehicle the airbag control unit 77960-SNA-X620-M1 controls the restraint system. It processes the readings of the crash sensors, determines the triggering of airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system continuously. After an accident it stores crash data and locks itself.

If the unit detects a fault, the airbag warning light in the instrument cluster comes on. The driver is thereby given a hint that something is wrong in the restraint system.

The unit makes the triggering decision on the basis of the sensor values it evaluates continuously.

Why does the control unit 77960-SNA-X620-M1 fail?

In most cases the 77960-SNA-X620-M1 traces back to stored crash data after an accident, even when no airbag has triggered, because a normal diagnostic tool does not erase it. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data are measurements from the accident. They remain in the unit and are only erased during a repair.

These further causes appear in everyday use:

• Electronics that weaken over the years
• Solder joints with a cold connection
• Moisture and rust at plug connections
• Voltage spikes, for example from a jump start

How can you tell that the 77960-SNA-X620-M1 is defective?

First signs on the 77960-SNA-X620-M1 are the airbag warning light in the instrument cluster, which stays on continuously or intermittently, an error message in the instrument cluster, a missing connection to the control unit at the diagnostic tool, and a fault memory that cannot be cleared. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

The light is a warning sign to which you should respond promptly. If it is on, have the restraint system checked. A check can establish whether the control unit itself or the wiring is affected.

Which vehicles is the 77960-SNA-X620-M1 fitted in?

The 77960-SNA-X620-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The models available for this control unit are listed here:

• Honda Civic 8th generation (2005-2011)

Comparing the part number on the label of the removed unit with this page gives certainty about the identity of the unit. The comparison does not decide the cause. Therefore have the fault memory read out beforehand, to establish whether the control unit itself or a plug or cable is affected.

For the same vehicles, we also repair control units with the part numbers 77960-S02-A840-M3, 77960-SMG-G014-M1.

How does the repair of the 77960-SNA-X620-M1 work?

The sequence begins with reading out the fault memory, and the log goes with the unit. Then disconnect the battery and remove the 77960-SNA-X620-M1. Next create the repair order online and send the unit in well packed. Processing, repair and function test at Airbag24 generally take 3–4 working days.

The order protects you in any work on the airbag system. Removal only follows once the battery has been disconnected.

At Airbag24 the submitted unit is checked and, where necessary, repaired. Defective components are replaced. The stored crash data is erased before the function test runs. 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-SNA-X620-M1 get to Airbag24?

You either send the 77960-SNA-X620-M1 as a parcel, or you choose a UPS collection for an extra charge. The return after the repair is made by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.