Airbag control unit with part number 77960-SDA-A620-M2

What does the airbag control unit 77960-SDA-A620-M2 do?

The airbag control unit 77960-SDA-A620-M2 monitors the restraint system (SRS) at Honda. From the data of the crash sensors it determines which airbags and seatbelt pretensioners are triggered in a collision, within a fraction of a second.

During operation the unit checks the system for faults. If it finds one, it stores the finding and shows it via the airbag warning light.

A collision leaves crash data in the unit, and after that it locks itself.

Why does the control unit 77960-SDA-A620-M2 fail?

First to mention are crash data stored in the 77960-SDA-A620-M2 after a collision, even if no airbag has deployed. Ageing electronics, moisture at the connectors and voltage spikes also come into play.

Crash data cannot be erased with a standard diagnostic tool. That makes it an important point in every fault search.

The other triggers concern the service life of the components, the connections between the plugs and the power supply. A weak battery or jump-starting can load the electronics with voltage spikes.

How can you tell that the 77960-SDA-A620-M2 is defective?

The airbag warning light in the instrument cluster indicates a defect on the 77960-SDA-A620-M2, either permanently or intermittently. In addition there are fault messages, a missing connection to the diagnostic tool and a fault memory that cannot be cleared.

• Airbag warning light permanently or intermittently on
• Fault message in the instrument cluster
• No connection can be made from the diagnostic tool to the control unit
• Fault memory cannot be cleared

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. The warning should therefore be clarified promptly.

These signs do not reveal which component is affected. For that, the fault memory needs to be read out.

Which vehicles is the 77960-SDA-A620-M2 fitted in?

The 77960-SDA-A620-M2 is fitted in these vehicles: Honda Accord 7th generation (2002-2008).

The overview below shows which vehicles belong to this part number.

• Honda Accord 7th generation (2002-2008)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Secondly, have the fault memory read out beforehand, because only that result 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-A620-M2 work?

The process starts with reading out the fault memory, and the log goes with the unit. Then you disconnect the battery and remove the control unit 77960-SDA-A620-M2 before you create the repair order online and send the well-packed unit in.

At the Airbag24 premises the unit is examined on the test bench, defective components are repaired, the stored crash data is erased and a function test is carried out. After that the unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days; removal, sending in and dispatch are not included in this.

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-A620-M2 get to Airbag24?

You send the control unit 77960-SDA-A620-M2 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair the unit comes back to you by UPS.

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