Airbag control unit with part number 77960-SDA-A820-M1

What does the airbag control unit 77960-SDA-A820-M1 do?

The 77960-SDA-A820-M1 control unit handles the SRS restraint system for Honda. It evaluates the impact and crash sensors and determines within milliseconds which airbags and seatbelt pretensioners fire.

The unit monitors the system continuously and shows faults via the airbag warning light in the instrument cluster. This way you learn early that something is wrong.

If an accident has occurred, the unit locks itself and the crash data remains stored.

Why does the control unit 77960-SDA-A820-M1 fail?

The control unit 77960-SDA-A820-M1 most often fails because of crash data stored after an accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

An ordinary diagnostic tool cannot remove this crash data, and that is precisely where the difficulty lies.

Electronic components can age over time, and solder joints can go cold. Moisture and corrosion attack connectors.

Voltage spikes arise, for example, from a weak battery or when a jump start is connected.

How can you tell that the 77960-SDA-A820-M1 is defective?

An airbag warning light in the instrument cluster that stays on permanently or intermittently is the typical sign of a defect in the 77960-SDA-A820-M1. In addition, error messages may appear in the instrument cluster, the diagnostic tool may fail to make contact, or the fault memory may not be clearable.

• Airbag warning light on permanently or intermittently
• Error message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not trigger in such a fault.

Which vehicles is the 77960-SDA-A820-M1 fitted in?

This control unit 77960-SDA-A820-M1 is fitted in these vehicles: Honda Accord 7th generation (2002-2008).

These vehicles are listed in our data for the control unit:

• Honda Accord 7th generation (2002-2008)

Checking whether the part number on the label of the removed unit matches this page only confirms the identity of the unit. Have the fault memory read out before removal, because only this result shows whether the control unit is defective or whether a connector 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-A820-M1 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit 77960-SDA-A820-M1.

After that, create a repair order online and pack the unit well before sending it.

At the test bench, Airbag24 checks the submitted control unit, replaces defective components, deletes the crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days, after which the return shipment follows. 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-A820-M1 get to Airbag24?

You send the control unit 77960-SDA-A820-M1 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Wrap the unit shock-proof and enclose the printed repair order.