Airbag control unit with part number 77960-SDA-C133-M1

What does the airbag control unit 77960-SDA-C133-M1 do?

The airbag control unit 77960-SDA-C133-M1 takes over the control of the restraint system (SRS) in Honda vehicles. It processes the crash sensors and decides in an accident within a few milliseconds on triggering the airbags and seatbelt pretensioners.

In addition it monitors the system continuously so that faults are noticed early. They are reported via the airbag warning light in the instrument cluster.

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

Why does the control unit 77960-SDA-C133-M1 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool does not erase it. Other causes are ageing electronics, cold solder joints, moisture at plug connections and voltage spikes.

Crash data can therefore be in the unit without any airbag having deployed. This can be overlooked in a fault.

The other causes can develop gradually, through ageing, moisture, or current and voltage fluctuations in the on-board electrical system. Whether one of them applies must be clarified by the examination.

How can you tell that the 77960-SDA-C133-M1 is defective?

The airbag warning light in the instrument cluster stays on constantly or intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may possibly not trigger if there is a defect like this. For that reason you should not ignore the warning and have the vehicle checked.

Which vehicles is the 77960-SDA-C133-M1 fitted in?

The control unit 77960-SDA-C133-M1 is fitted in these vehicles: Honda Accord 7th generation (2002-2008).

The list summarises the vehicles that Airbag24 holds for this part number.

• Honda Accord 7th generation (2002-2008)

Comparing the part number on the label of the removed unit with this page ensures that it is the right unit. Have the fault memory read out beforehand, because only this shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-SDA-306, 77960-SDN-C211-M1, 77960-SDR-A021-M4.

How does the repair of the 77960-SDA-C133-M1 work?

First read out the fault memory and enclose the log. Then disconnect the battery, only then remove the control unit and create a repair order online. Send the well-packed unit afterwards.

Airbag24 tests the unit on the test bench, replaces defective components and erases the stored crash data. Processing usually takes 3–4 working days.

A function test then follows, and 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-SDA-C133-M1 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 returns the repaired unit to you by UPS.

Pack the printed repair order into the parcel and the control unit shock-proof.