Airbag control unit with part number 77960-SMR-F120-M1

What does the airbag control unit 77960-SMR-F120-M1 do?

The airbag control unit 77960-SMR-F120-M1 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors and decides within milliseconds in an emergency which airbags and seatbelt pretensioners trigger. It also monitors the system continuously and shows faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself.

The control unit works in the background during every journey and continuously checks the connected sensors and wiring.

Why does the control unit 77960-SMR-F120-M1 fail?

For the 77960-SMR-F120-M1, stored crash data from an accident is the most common cause, even if no airbag has deployed. Aged electronics, cold solder joints, moisture and voltage spikes are also possible causes.

A normal diagnostic tool cannot erase this crash data. Airbag24 erases it during the repair.

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

Which of these causes is actually present only becomes clear during the check.

How can you tell that the 77960-SMR-F120-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as the 77960-SMR-F120-M1 has a defect. In addition a fault message appears in the instrument cluster, and the diagnostic tool finds no connection to the control unit.

A fault memory that cannot be cleared also indicates a malfunction. In an emergency, airbags and seatbelt pretensioners may then not deploy.

Have the warning light checked promptly instead of ignoring it.

Which vehicles is the 77960-SMR-F120-M1 fitted in?

The 77960-SMR-F120-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The list below names the vehicles for which this part number is stored.

• Honda Civic 8th generation (2005-2011)

Comparing the part number on the label of the removed unit with this page only shows that you have the correct unit in front of you. Whether the control unit itself is defective, or whether a plug or cable is the cause, is only clarified by reading out the fault memory. Please have this done beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-SMG-G014-M1, 77960-SMG-G021-M1, 77960-SMG-G120-M1, 77960-SNA-L220-M1, 77960-SNA-L230-M1, 77960-SNA-M410-M1.

How does the repair of the 77960-SMR-F120-M1 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Next, create a repair order online and send the well-packed unit in. Processing at Airbag24 takes 3–4 working days as a rule.

Airbag24 checks the unit on the test bench, replaces defective components, removes the stored crash data and carries out a function test. Afterwards the 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-SMR-F120-M1 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 sends the control unit 77960-SMR-F120-M1 back by UPS. Enclose the printed repair order and pack the unit so that it is shock-proof.

A sturdy carton with padding all round protects the unit during transport.