Airbag control unit with part number 77960-SDA-A815-M1

What does the airbag control unit 77960-SDA-A815-M1 do?

The 77960-SDA-A815-M1 controls the restraint system (SRS) at Honda. It evaluates the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered.

The decision falls within milliseconds. During operation the unit monitors the entire system and shows faults via the airbag warning light.

After an accident it stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit 77960-SDA-A815-M1 fail?

The most common cause for the 77960-SDA-A815-M1 is crash data from an accident that is stored even if no airbag was triggered. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

A normal diagnostic tool cannot clear this crash data. Airbag24 takes care of it during the repair.

The other causes affect the electronics directly or through their contacts. Voltage spikes are among them, for example when the battery is weak or a jump start has been given.

How can you tell that the 77960-SDA-A815-M1 is defective?

On the 77960-SDA-A815-M1, a defect shows up through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and through a fault message. A missing connection to the diagnostic tool and a fault memory that cannot be cleared may also be present.

The airbag warning light shows the finding directly once the control unit has detected a fault. A diagnostic tool that cannot make a connection then confirms the same fault from another side.

In an emergency, airbags and seatbelt pretensioners may therefore possibly not deploy. The warning is therefore to be taken seriously.

Which vehicles is the 77960-SDA-A815-M1 fitted in?

The 77960-SDA-A815-M1 is fitted in these vehicles: Honda Accord 7th generation (2002-2008).

Below is the list of vehicles equipped with this control unit:

• Honda Accord 7th generation (2002-2008)

Comparing the part number on the label of the removed unit with this page only shows whether it is the right unit. Nothing more. So have the fault memory read out beforehand, because only that result 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-SDA-306, 77960-SDN-C211-M1, 77960-SDR-A021-M4.

How does the repair of the 77960-SDA-A815-M1 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the 77960-SDA-A815-M1. Afterwards 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, replaces defective components, clears the crash data and carries out a function test. This time limit applies only to checking, repairing and testing.

Afterwards 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-A815-M1 get to Airbag24?

You send the 77960-SDA-A815-M1 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns the unit by UPS.

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