Airbag control unit with part number 77960-T1E-R911-M4

What does the airbag control unit 77960-T1E-R911-M4 do?

The airbag control unit 77960-T1E-R911-M4 is the central control unit of the SRS system for Honda. It evaluates crash sensors, determines within milliseconds in the event of an accident whether the airbags and seatbelt pretensioners are triggered, and monitors the entire system. It reports faults via the airbag warning light.

While driving, the unit continuously receives measured values from the crash sensors. If the evaluation detects an impact that requires deployment, it controls the airbags and seatbelt pretensioners accordingly.

After a crash, the unit stores crash data and locks itself. This storage is part of the unit's function.

Why does the control unit 77960-T1E-R911-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 it. Other suspected causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains in the memory until Airbag24 erases it during the repair. Disconnecting the battery changes nothing about this.

The other causes concern electronics in general. Components age over time, solder joints can be cold, and moisture or corrosion affect plug connections. Voltage spikes arise, for example, from a weak battery or from starting with jump leads.

How can you tell that the 77960-T1E-R911-M4 is defective?

A defect shows up through the airbag warning light, which lights up permanently or intermittently, through an error message in the instrument cluster, through a diagnostic tool without connection to the control unit, and through a fault memory that cannot be cleared. Any one of these signs is enough reason to check the cause more closely.

The warning light reports the fault directly to the driver. In an emergency, airbags and seatbelt pretensioners may possibly not deploy in the event of such a defect.

Only reading out the fault memory shows which component is affected. The light alone does not name the cause.

Which vehicles is the 77960-T1E-R911-M4 fitted in?

The list serves for assignment and remains a guide. The control unit 77960-T1E-R911-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The vehicles belonging to this number are listed individually here:

• Honda CR-V 4 RM (2012-2018)

Before you send the unit in, check two things. First, compare the part number on the label of the removed unit with this page; this shows whether it is the right unit. Second, have the fault memory read out beforehand, because only the result shows whether the control unit is defective or a plug or cable is the cause.

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-T1E-R911-M4 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit 77960-T1E-R911-M4; then create a repair order online and send in the unit well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days. After that, your own unit is returned.

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-T1E-R911-M4 get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit shockproof.