Airbag control unit with part number 77960-S9A-A220-M1

What does the airbag control unit 77960-S9A-A220-M1 do?

The airbag control unit 77960-S9A-A220-M1 coordinates the SRS restraint system of Honda. In an impact, it evaluates the signals from the crash sensors and decides which airbags and seatbelt pretensioners trigger. It also monitors the system and reports faults via the airbag warning light.

The sensors continuously supply the unit with data, from which it derives the position of the vehicle. The control unit carries out this evaluation independently.

After an accident, it stores crash data and locks itself. This behaviour is provided for in the system logic.

Why does the control unit 77960-S9A-A220-M1 fail?

The most common cause with the 77960-S9A-A220-M1 is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plugs, and voltage spikes from a weak battery or a jump start.

The diagnostic tool reads the fault memory but cannot remove these entries. For this reason, the entry stays in the system, and only the repair removes it.

The remaining causes lie in the electronics and the connections. Over time, components age, solder joints can be faulty, and moisture or corrosion weaken the contacts. Voltage spikes from the vehicle electrical system add further strain.

How can you tell that the 77960-S9A-A220-M1 is defective?

The defect on the 77960-S9A-A220-M1 shows itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. In addition, there are a fault message, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

• airbag warning light stays on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool gets no connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not trigger while such a finding exists. A prompt check is therefore advisable.

Which vehicles is the 77960-S9A-A220-M1 fitted in?

The control unit 77960-S9A-A220-M1 is fitted in these vehicles: Honda CR-V 2 RD (2001-2006).

This list names the vehicles for this part number:

• Honda CR-V 2 RD (2001-2006)

Comparing the part number on the label with this page ensures that the unit fits. It does not clarify whether the unit is defective. For that, have the fault memory read out in advance, because the log shows whether the control unit or a plug or cable is affected.

For the same vehicles, we also repair control units with the part numbers 77960-S9A-A924-M1, 77960-SWA-G214-M4.

How does the repair of the 77960-S9A-A220-M1 work?

On the 77960-S9A-A220-M1, you first have the fault memory read out and keep the log. Then you disconnect the battery and only afterwards remove the control unit. Next, you create the repair order online and send the unit in.

Airbag24 checks the unit on the test bench, repairs defective components, removes the stored crash data and carries out a function test. Afterwards, your own unit goes back to you. This 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-S9A-A220-M1 get to Airbag24?

You send the control unit 77960-S9A-A220-M1 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS. The printed repair order is in the parcel, and the unit is packed shockproof.

Padding around the unit prevents it from taking knocks inside the carton.