Airbag control unit with part number 77960-TM8-G811-M2

What does the airbag control unit 77960-TM8-G811-M2 do?

The unit 77960-TM8-G811-M2 is the airbag control unit of the restraint system (SRS) for Honda. It continuously checks the signals from the crash sensors and decides in an accident, within milliseconds, whether the airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

Faults in the system are reported via the airbag warning light in the instrument cluster. Without any irregularities you notice nothing of the evaluation, as it runs in the background.

So that triggering remains reliable in an emergency, the electronics in the unit must work just as cleanly as the lines to the sensors and to the seatbelt pretensioners. Even a disturbed connection can impair the function.

Why does the control unit 77960-TM8-G811-M2 fail?

The most common cause for the 77960-TM8-G811-M2 is crash data that remains in the unit after an accident, even without an airbag having fired. Added to this are aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes in the vehicle electrics.

Crash data stays in the memory even if the airbags did not fire. It cannot be removed with a normal diagnostic tool, but during repair at Airbag24 it can: there it is erased.

Electronic components age over time. Solder joints can become cold, and moisture or corrosion at plug connections increases the transition resistance.

Voltage spikes, for example from a weak battery or when a jump start is connected, stress the electronics. Which cause applies in the individual case only the test shows.

How can you tell that the 77960-TM8-G811-M2 is defective?

A defect in the 77960-TM8-G811-M2 shows up on the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Then the airbags and seatbelt pretensioners may not be able to deploy in a crash.

A fault message in the instrument cluster may accompany it. If the diagnostic tool shows no connection to the control unit, or the fault memory cannot be cleared, that is a further sign of a defect that should be checked.

The warning light reports the fault as soon as the system detects it. If you see it lit, have the system checked promptly, because only a test can establish whether the control unit, a connector or a cable is affected.

Which vehicles is the 77960-TM8-G811-M2 fitted in?

The 77960-TM8-G811-M2 was fitted in these vehicles: Honda Insight 2nd generation (2009-2014). The information refers to the part number and not to the condition of an individual unit.

The list shows the vehicles recorded for this part number.

• Honda Insight 2nd generation (2009-2014)

Compare the label on the removed unit with the part number on this page; then you know it is the right unit. Have the fault memory read out beforehand: only this result shows whether the control unit itself is defective or whether a connector or cable is behind it.

For the same vehicles, we also repair control units with the part numbers 77960-TM8-A01, 77960-TM8-A020-M2, 77960-TM8-A03.

How does the repair of the 77960-TM8-G811-M2 work?

Have the fault memory of the control unit 77960-TM8-G811-M2 read out and attach the log. Then disconnect the battery, remove the unit, create a repair order online and send it in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The unit then goes back to you.

The 3–4 working days refer only to this work at Airbag24.

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-TM8-G811-M2 get to Airbag24?

You can send the control unit 77960-TM8-G811-M2 yourself as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back to you by UPS.

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