Airbag control unit with part number 77960-SDA-A813-M1

What does the airbag control unit 77960-SDA-A813-M1 do?

The airbag control unit 77960-SDA-A813-M1 controls the restraint system (SRS) in Honda. It processes the measured values from the impact sensors and, in an accident, triggers the appropriate airbags and seatbelt pretensioners within fractions of a second. It shows detected faults via the airbag warning light.

During operation the control unit constantly checks whether the power supply, the firing circuits and the connections are in order. It stores irregularities in the fault memory so that a workshop can read them out later.

After an accident the control unit stores crash data and locks itself.

Why does the control unit 77960-SDA-A813-M1 fail?

Stored crash data is the most common cause: it remains in the unit after an accident, even if no airbag was triggered, and a normal diagnostic tool cannot erase it. Ageing electronics, cold solder joints and moisture at the plug connectors are also possible causes.

Crash data cannot be removed with a normal diagnostic tool. Airbag24 erases it during the repair, so the unit can be checked without this entry.

Electronic components age, and their solder joints can lose their hold over time. Moisture and corrosion at the plugs lead to faulty contacts, which the control unit then reports.

Voltage spikes, for example from a weak battery or jump-starting, are also among the possible triggers.

How can you tell that the 77960-SDA-A813-M1 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, a fault message appears on the display, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In that case, the airbags and seatbelt pretensioners may fail to trigger in an emergency.

The warning light coming on is the most important warning sign. It is reason enough to have the system checked, even if the light only comes on intermittently.

The fault message on the display and the missing connection to the diagnostic tool belong to the same picture. How pronounced the signs are does not matter for the decision.

Which vehicles is the 77960-SDA-A813-M1 fitted in?

The 77960-SDA-A813-M1 is fitted in these vehicles: Honda Accord 7th generation (2002-2008).

The following overview shows the models for which this part number is intended.

• Honda Accord 7th generation (2002-2008)

Compare the part number on the label of the removed unit with this page. That establishes that it is the right unit, but nothing more about the cause. Also have the fault memory read out beforehand; only then does it become clear whether the control unit is defective or whether a plug or a cable is causing the fault.

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-A813-M1 work?

First have the fault memory read out and enclose the printout, then disconnect the battery and only then remove the control unit 77960-SDA-A813-M1. Then create the repair order online and send in the unit carefully packed. Processing at Airbag24 usually takes 3–4 working days.

The order is binding for safety reasons. Removal should take place only once the battery is disconnected, as described above.

At Airbag24 the unit is checked on the test bench, defective components are renewed, stored crash data is erased, and a function test completes the work. Your own unit then 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-A813-M1 get to Airbag24?

You send the control unit 77960-SDA-A813-M1 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, it comes back to you by UPS.

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