Airbag control unit with part number 77960-T1G-E940-M4

What does the airbag control unit 77960-T1G-E940-M4 do?

The airbag control unit 77960-T1G-E940-M4 is the central control unit of the SRS restraint system for Honda. It processes the signals from the crash sensors and decides in a collision, within milliseconds, whether airbags and seatbelt pretensioners are triggered.

During operation it checks the components and reports faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. The lock only ends with the repair.

Why does the control unit 77960-T1G-E940-M4 fail?

Stored crash data is the most common cause on the 77960-T1G-E940-M4, even if no airbag has been triggered. A normal diagnostic tool cannot remove this data. In addition, ageing components, cold solder joints, moisture and voltage spikes can cause the failure.

The crash data remains stored until Airbag24 erases it as part of the repair.

Electronic components age over time, and solder joints can go cold. This leads to contact problems.

Moisture and corrosion attack the plug connections. Voltage spikes, for example from a weak battery or a jump start, are a further cause.

How can you tell that the 77960-T1G-E940-M4 is defective?

The airbag warning light in the instrument cluster comes on permanently or intermittently, and a fault message appears in the instrument cluster. In addition, the diagnostic tool gets no connection to the control unit 77960-T1G-E940-M4, and the fault memory cannot be cleared.

The warning light is the sign you are most likely to notice. Such a finding calls for a check, even if the vehicle otherwise runs unremarkably in everyday use.

In a crash, airbags and seatbelt pretensioners may then fail to trigger. Please arrange a check promptly.

Which vehicles is the 77960-T1G-E940-M4 fitted in?

The airbag control unit 77960-T1G-E940-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). The part number on the label of the removed unit is compared.

The overview of vehicles assigned to this unit is shown here:

• Honda CR-V 4 RM (2012-2018)

Comparing the part number on the label with this page only confirms that it is the correct unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-T1G-G920-M4.

How does the repair of the 77960-T1G-E940-M4 work?

You have the fault memory read out and enclose the record, then disconnect the battery. After that you remove the control unit 77960-T1G-E940-M4, create a repair order online and send the well-packed unit in. Airbag24 needs 3–4 working days for checking, repairing and testing.

On the test bench Airbag24 examines the unit, replaces defective components and erases the stored crash data. A functional test follows.

Afterwards your own 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-T1G-E940-M4 get to Airbag24?

You send the control unit 77960-T1G-E940-M4 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it by UPS.

The printed repair order goes into the parcel, and the unit is packed shock-resistant.