Airbag control unit with part number 77960-SEA-E820-M1

What does the airbag control unit 77960-SEA-E820-M1 do?

The airbag control unit 77960-SEA-E820-M1 controls the restraint system (SRS) for Honda. It monitors the crash sensors and calculates in milliseconds, in an accident, the necessary triggering, activating airbags and seatbelt pretensioners.

In addition, the unit checks the system itself continuously. If it detects a fault, the airbag warning light comes on. After an accident it stores crash data and locks itself.

Why does the control unit 77960-SEA-E820-M1 fail?

Most often, the cause is crash data stored after an accident, even if no airbag was triggered. 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 a jump start.

A normal diagnostic tool cannot erase the crash data. As long as it is stored, the fault remains.

The other causes are rather general. Components age, solder joints can go cold, and moisture attacks the plug contacts.

Voltage spikes stress the electronics when the battery is weak or a vehicle has to be started with jump leads.

How can you tell that the 77960-SEA-E820-M1 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. This is accompanied by a fault message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

It is the clearest warning the system issues and therefore deserves a prompt check.

A diagnostic tool that cannot establish a connection also indicates a problem in the system.

Which vehicles is the 77960-SEA-E820-M1 fitted in?

In this vehicle the control unit 77960-SEA-E820-M1 is installed: Honda Accord 7th generation (2002-2008).

The list below follows, naming the vehicles to which this unit belongs.

• Honda Accord 7th generation (2002-2008)

(a) A comparison of the part number on the label with this page only ensures that it is the correct unit, nothing more. (b) Only the fault log read out beforehand shows whether the control unit itself 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-SEA-E820-M1 work?

First read out the fault memory and enclose the report. Then disconnect the battery; only afterwards remove the control unit 77960-SEA-E820-M1. Next, create the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. For these steps, processing usually takes 3–4 working days.

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-SEA-E820-M1 get to Airbag24?

You send the control unit 77960-SEA-E820-M1 as a parcel or book a UPS collection for an extra charge. After the repair, it reaches you again by UPS.

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