Airbag control unit with part number 77960-SMR-S110-M1

What does the airbag control unit 77960-SMR-S110-M1 do?

The airbag control unit 77960-SMR-S110-M1 is the central control unit of the restraint system (SRS) for Honda. It evaluates the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the entire system permanently. After a crash it stores crash data and locks itself.

Faults in the system are reported by the control unit via the airbag warning light. To do this, it continuously checks the sensors, the wiring and the connection to the triggers.

The evaluation has to happen faster than a person can react. For this reason the unit works closely with the vehicle electrical system and is firmly integrated into the vehicle.

Why does the control unit 77960-SMR-S110-M1 fail?

The most common cause is stored crash data after an accident, even if no airbag has deployed, and this data cannot be erased with a standard diagnostic tool. Other factors include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The stored crash data mean that after an accident the unit cannot be reset as usual. Airbag24 erases this data during the repair, so the unit comes back without it.

The other causes develop over time or arise from environmental influences in the vehicle. Solder joints can go cold, plug contacts corrode, and a weak battery or a jump start briefly throws the voltage in the vehicle electrical system out of balance.

How can you tell that the 77960-SMR-S110-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool cannot connect to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

The warning light is the most important sign you can observe in everyday driving. Switch on the ignition and watch the light and any messages on the display.

If the diagnostic tool stays without a connection, this is a finding that needs to be clarified before a cause can be established.

Which vehicles is the 77960-SMR-S110-M1 fitted in?

The airbag control unit 77960-SMR-S110-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The list shows the vehicles recorded in our data for this part number:

• Honda Civic 8th generation (2005-2011)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the correct unit. Also have the fault memory read out before you remove anything, because only the log 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-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-S110-M1 work?

Processing at Airbag24 usually takes 3–4 working days. First you read out the fault memory and enclose the log, then you disconnect the battery and only then remove the control unit.

Afterwards you create a repair order online and pack the unit securely before sending it. Airbag24 tests it on the test bench, repairs or replaces defective components, erases stored crash data and carries out a function test.

Your own unit is then sent back. The processing time applies only to testing, repairing and checking at Airbag24.

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-S110-M1 get to Airbag24?

You send in the control unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof before it sets off.