Airbag control unit with part number 77960-S5A-A951-M1

What does the airbag control unit 77960-S5A-A951-M1 do?

The airbag control unit 77960-S5A-A951-M1 is the central control unit of the restraint system (SRS) for Honda: it evaluates the signals from the crash sensors, decides in a fraction of a second in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

If the unit detects a fault, it shows it via the airbag warning light in the instrument cluster. The light thus signals that something is wrong; the fault memory reveals the cause.

Why does the control unit 77960-S5A-A951-M1 fail?

The most common cause: crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it, but Airbag24 erases it during the repair. Other causes are ageing electronic components, cold solder joints, corrosion at plug connections and voltage spikes.

• ageing electronic components in the unit
• cold solder joints on the circuit board
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or jump-starting

Which of these causes applies can only be determined by reading the fault memory together with an examination of the unit.

How can you tell that the 77960-S5A-A951-M1 is defective?

The airbag warning light in the instrument cluster stays on constantly or comes on intermittently, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Note whether the light only comes on briefly when the ignition is switched on or stays on, and write down the wording of the error message. Both help with the assessment before you send the unit in.

Which vehicles is the 77960-S5A-A951-M1 fitted in?

The control unit 77960-S5A-A951-M1 is fitted in these vehicles: Honda Civic 7th generation (2000-2005).

The list below shows the vehicles that Airbag24 has assigned to this part number.

• Honda Civic 7th generation (2000-2005)

Compare the part number on the label of the removed unit with this page; this only confirms that you have the right unit. Have the fault memory read out beforehand as well, because only this log 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-S5A-A811-M1, 77960-S5P-A121-M1, 77960-S5S-G920-M1, 77960-S6A-G921-M2, 77960-S6A-G960-M2.

How does the repair of the 77960-S5A-A951-M1 work?

First have the fault memory read out and attach the log; then disconnect the battery and remove the control unit. After that create a repair order online and send in the unit well packed.

This order is mandatory for safety reasons. The control unit is only removed once the fault memory has been read out and the battery disconnected.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days; this time covers only checking, repair and testing. Your own unit is then sent 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-S5A-A951-M1 get to Airbag24?

You send the control unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

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