Airbag control unit with part number 77960-T0N-S711-M4

What does the airbag control unit 77960-T0N-S711-M4 do?

The airbag control unit 77960-T0N-S711-M4 forms the control centre of the SRS restraint system at Honda. It detects crash signals, decides within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the entire system. It reports findings via the airbag warning light.

The crash sensors constantly supply values from which the unit judges the situation. In this way the control unit connects the sensors with the restraint devices in the vehicle.

After an accident it stores crash data and locks itself.

Why does the control unit 77960-T0N-S711-M4 fail?

The most common cause is stored crash data after an accident, even if no airbag was triggered. A normal diagnostic tool cannot delete it. Other triggers are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data stays in the memory, and a diagnostic tool cannot reach it.

The remaining causes concern the electronics and connections. Aged components lose reliability over time, cold solder joints are hardly visible, and moisture attacks plug connections.

Voltage spikes arise, for example, with a weak battery or when starting with external power. They stress the circuits in the control unit.

How can you tell that the 77960-T0N-S711-M4 is defective?

A defect shows as an airbag warning light that lights up constantly or flickers, and as fault messages in the instrument cluster. In addition, the diagnostic tool cannot establish a connection to the control unit, and the fault memory remains.

• The warning light in the instrument cluster stays on constantly or flickers.
• The instrument cluster shows a fault message.
• A diagnostic tool finds no connection to the control unit.
• Stored faults cannot be removed.

In an emergency, airbags and seatbelt pretensioners may not trigger in the event of a defect. Any indication on the instrument cluster therefore deserves attention.

The warning light indicates a defect as soon as the unit detects it. A contact problem can also lie in cables or plugs.

Which vehicles is the 77960-T0N-S711-M4 fitted in?

The 77960-T0N-S711-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

For fitment, here is the vehicle list for this part number:

• Honda CR-V 4 RM (2012-2018)

Before removing the unit, compare the part number on the label with this page. This comparison only shows that it is the correct unit, not whether it is defective. In addition, have the fault memory read out. The result decides whether the control unit is the cause or whether a plug or cable causes the fault.

For the same vehicles, we also repair control units with the part numbers 77960-T0A-3070-M4, 77960-T0A-A012-M1, 77960-T0A-A013-M1, 77960-T0A-A210-M1, 77960-T0A-A212-M1, 77960-T0A-A230-M1.

How does the repair of the 77960-T0N-S711-M4 work?

First have the fault memory read out; the log goes into the parcel later. Only then follow disconnecting the battery and removal. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and send the unit in well packed. Airbag24 checks it on the test bench, replaces defective components, deletes stored crash data and performs a function test. Afterwards the unit is returned 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-T0N-S711-M4 get to Airbag24?

The unit goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

Print the repair order and enclose it with the parcel. Pack the control unit shock-proof.