Airbag control unit with part number 77960-T1G-G940-M4

What does the airbag control unit 77960-T1G-G940-M4 do?

The airbag control unit 77960-T1G-G940-M4 controls the restraint system (SRS) in the Honda. It receives the signals from the crash sensors, decides within milliseconds in an accident on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. It reports faults via the airbag warning light.

The crash sensors continuously supply the unit with measurements of acceleration and impact force. From these values the control unit calculates whether the restraint devices must be activated. It also checks its connections to the connected components, so that a fault is detected.

After an accident the control unit stores crash data and then locks itself. Storing them is part of the evaluation of the incident.

Why does the control unit 77960-T1G-G940-M4 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase them. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes, for example from a weak battery or a jump start.

Airbag24 erases the crash data as part of the repair. That point is therefore settled, and the other causes are examined during the test on the test bench.

The other causes act in everyday use in quite different ways. Components change with age, solder joints can turn cold, and moisture or corrosion affects the contacts.

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes

How can you tell that the 77960-T1G-G940-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, there is a fault message in the instrument cluster, a lack of connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

Each of these signs can indicate a fault in the restraint system. The warning light is the notice the vehicle gives itself.

In an emergency, airbags and seatbelt pretensioners may possibly fail to deploy with such a defect. It is therefore important not to ignore a lit warning light.

Which vehicles is the 77960-T1G-G940-M4 fitted in?

The airbag control unit 77960-T1G-G940-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The following list shows the vehicles that are on record for this part number.

• Honda CR-V 4 RM (2012-2018)

Helpful here are separate steps. Compare the part number on the label of the removed unit with this page; that way you know it is the right unit, nothing more. In addition, have the fault memory read out in advance, because only this result 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 5WK43782, 77960-SWA-G212-M4, 77960-SWA-G214-M4, 77960-T1G-G920-M4.

How does the repair of the 77960-T1G-G940-M4 work?

At Airbag24 the processing usually takes 3–4 working days. Before that, have the fault memory read out and enclose the log, disconnect the battery, and only then remove the control unit. Then create the repair order online.

Airbag24 checks the unit on the test bench and replaces defective components. Afterwards Airbag24 erases the stored crash data and carries out a function test; then 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-G940-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an additional charge. After the repair, Airbag24 sends it back to you by UPS.

Place the printed repair order in the parcel, and pack the control unit shock-proof.