Airbag control unit with part number 77960-SMG-E021-M1

What does the airbag control unit 77960-SMG-E021-M1 do?

The airbag control unit 77960-SMG-E021-M1 is the central control unit of the restraint system (SRS) of Honda. It evaluates the signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered. At the same time, it monitors the system continuously and reports faults via the airbag warning light.

Among other things, it checks the activation of the airbags and seatbelt pretensioners. After an accident, the control unit stores crash data and locks itself.

Why does the control unit 77960-SMG-E021-M1 fail?

Most often the cause is crash data stored after an accident, even if no airbag was deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Crash data cannot be erased with a normal diagnostic tool, so it remains stored in the control unit. The other causes in detail:

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

How can you tell that the 77960-SMG-E021-M1 is defective?

A defect shows itself when the airbag warning light in the instrument cluster lights up permanently or intermittently, when an error message appears, when the diagnostic tool cannot establish a connection to the control unit, or when the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may not trigger in an emergency.

The signs in detail:

• airbag warning light on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool gets no connection to the control unit
• fault memory cannot be cleared

If the warning light comes on, you should act promptly, even if nothing unusual is noticeable while driving.

Which vehicles is the 77960-SMG-E021-M1 fitted in?

The airbag control unit 77960-SMG-E021-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011). Check the model and year of construction of your vehicle against the assignment.

For this number we list the following vehicles:

• Honda Civic 8th generation (2005-2011)

Before removal, compare the part number on the label of the unit with this page. This only confirms that it is the right unit. Also have the fault memory read out, because only the result shows whether the control unit is defective or whether a plug or a 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-SMG-E021-M1 work?

First have the fault memory read out and enclose the log with the parcel. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in well packed; processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and replaces defective components. Airbag24 erases stored crash data during the repair, followed by a function test, before your own unit is 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-SMG-E021-M1 get to Airbag24?

You send the control unit 77960-SMG-E021-M1 in as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

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