Airbag control unit with part number 77960-SNA-L220-M1

What does the airbag control unit 77960-SNA-L220-M1 do?

For Honda, the airbag control unit 77960-SNA-L220-M1 is the central control unit of the restraint system (SRS). It evaluates the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It shows faults via the airbag warning light.

After an accident, it stores crash data and locks itself. It is therefore a safety component whose condition should be kept in view.

Why does the control unit 77960-SNA-L220-M1 fail?

The most common cause for the 77960-SNA-L220-M1 is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool does not delete it. Other possible causes are ageing, cold solder joints, moisture and corrosion, and voltage spikes.

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

Crash data remains stored until it is removed during the repair and keeps the fault active.

How can you tell that the 77960-SNA-L220-M1 is defective?

A clear sign of a defect in the 77960-SNA-L220-M1 is the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Other signs are fault messages, a diagnostic tool with no connection to the control unit, and a fault memory that cannot be cleared.

As long as these signs persist, airbags and seatbelt pretensioners may not trigger in an emergency. It is worth having the cause checked promptly.

Which vehicles is the 77960-SNA-L220-M1 fitted in?

The 77960-SNA-L220-M1 is fitted by Honda in these vehicles: Honda Civic 8th generation (2005-2011).

The vehicles are listed here in an overview:

• Honda Civic 8th generation (2005-2011)

Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit. Whether the control unit itself is defective or a plug or cable is behind the fault only becomes clear from the fault memory, which you should have read out beforehand.

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-L220-M1 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 77960-SNA-L220-M1. Next, create a repair order online and send in the securely packed unit.

At Airbag24 the unit is checked and repaired if necessary: defective components are replaced, crash data is deleted and a functional test is carried out afterwards.

For checking, repair and testing, you should generally allow 3–4 working days. Your own unit is then 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-SNA-L220-M1 get to Airbag24?

The control unit 77960-SNA-L220-M1 either goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns it by UPS after the repair.

The parcel contains the printed repair order, and the unit is packed in a shockproof way.