Airbag control unit with part number 77960-T1G-S920-M4

What does the airbag control unit 77960-T1G-S920-M4 do?

The airbag control unit 77960-T1G-S920-M4 is the central component of the restraint system (SRS) for Honda. It evaluates sensor signals, triggers airbags and seatbelt pretensioners in an accident, and shows faults via the airbag warning light.

The control unit monitors the entire system constantly. If it detects an accident, it stores crash data and then locks itself.

Behind this is an evaluation that runs in milliseconds and works without any input from the driver.

Why does the control unit 77960-T1G-S920-M4 fail?

For the 77960-T1G-S920-M4, the most common cause is crash data stored after an accident, even if no airbag has triggered. A normal diagnostic tool cannot remove this data. Further causes are aged electronics, cold solder joints, moisture and rust on plugs, and voltage spikes.

Stored crash data persists stubbornly: an ordinary diagnostic tool can find it but cannot erase it.

The other causes include aged electronics, cold solder joints, moisture and rust on plugs, and voltage spikes, for example from a weak battery or a jump start.

These causes act over a longer period before a fault becomes visible.

How can you tell that the 77960-T1G-S920-M4 is defective?

A defect on the 77960-T1G-S920-M4 shows up through the airbag warning light in the instrument cluster, which lights up constantly or intermittently. Fault messages in the instrument cluster may be added, a diagnostic tool may fail to connect to the control unit, and a fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may possibly not trigger.

The warning light is the clearest hint the vehicle gives. It shows the defect even when the vehicle otherwise runs completely normally.

If the diagnostic tool does not communicate with the control unit at all, a check is worthwhile without delay.

Which vehicles is the 77960-T1G-S920-M4 fitted in?

In these vehicles the airbag control unit 77960-T1G-S920-M4 is fitted: Honda CR-V 4 RM (2012-2018).

These vehicles are shown in the following overview.

• Honda CR-V 4 RM (2012-2018)

A comparison of the part number on the label of the removed unit with this page shows whether the unit fits. This is a pure identity check. Have the fault memory read out in addition, because only it shows whether the control unit is defective 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-S920-M4 work?

For the 77960-T1G-S920-M4, everything starts with the fault memory read out, whose log is attached to the order. Then disconnect the battery, only then remove the control unit, and afterwards create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

After sending, Airbag24 checks the unit on the test bench and replaces defective components where needed. Airbag24 erases the crash data, carries out a functional test and sends your own unit back.

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-S920-M4 get to Airbag24?

The control unit 77960-T1G-S920-M4 reaches Airbag24 either as a parcel or through a UPS collection booked for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Pack the unit shock-proof and enclose the printed repair order.