Airbag control unit with part number 77960-T1G-B920-M4

What does the airbag control unit 77960-T1G-B920-M4 do?

The airbag control unit 77960-T1G-B920-M4 takes over control of the restraint system (SRS) at Honda. It measures via the impact sensors whether a crash has occurred and then decides on airbags and seatbelt pretensioners.

In addition, it continuously checks itself and the connected technology. A detected fault is stored in memory and appears on the airbag warning light.

If the unit has registered an accident, crash data remains stored and the unit is locked.

Why does the control unit 77960-T1G-B920-M4 fail?

The most common cause is crash data after an accident, even if no airbag has triggered; an ordinary diagnostic tool cannot remove it. In addition there are aged components, cold solder joints, moisture with corrosion at plug connectors, and voltage spikes.

The crash data is a record of the impact in the control unit. It cannot be removed with ordinary diagnostic equipment, and Airbag24 erases it during the repair.

The other causes take effect more gradually. Components age, solder joints can be cold or give way later, and moisture settles in plugs. Voltage spikes from the vehicle electrical system, for example from a weak battery or a jump start, further strain the electronics.

How can you tell that the 77960-T1G-B920-M4 is defective?

The airbag warning light in the instrument cluster is the most important sign: it stays on permanently or intermittently when a defect is present. In addition there may be error messages in the instrument cluster, no contact to the diagnostic tool, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then possibly fail to trigger.

The light reports the finding, and if it does not go out after the ignition is switched on, you should have the fault memory read out.

Error messages or connection problems may point to the control unit, but they can also come from plugs or lines. The read-out shows whether the unit itself is affected.

Which vehicles is the 77960-T1G-B920-M4 fitted in?

At Honda, the control unit 77960-T1G-B920-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018). This statement rests on the assignment to Honda.

The following list shows the vehicles.

• Honda CR-V 4 RM (2012-2018)

Comparing the part number on the label with this page only confirms the identity of the unit. The fault memory, which you should have read out before removal, provides clarity on whether the control unit is defective or 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-B920-M4 work?

Have the fault memory read out first, enclose the log, and disconnect the battery before you remove the control unit. Airbag24 needs 3–4 working days as a rule for checking, repairing and the function test.

Afterwards you create the repair order online and send the unit well packed. At Airbag24 the unit is examined on the test bench, defective components are repaired, the stored crash data is erased and a function test is carried out. Then your own unit goes back to you.

The 3–4 working days refer exclusively to the 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-T1G-B920-M4 get to Airbag24?

You send the control unit 77960-T1G-B920-M4 as a parcel, or you book a UPS collection for an extra 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-resistant.