Airbag control unit with part number 77960-T0A-Q010-M4

What does the airbag control unit 77960-T0A-Q010-M4 do?

The airbag control unit 77960-T0A-Q010-M4 controls the restraint system (SRS) in Honda: it evaluates the signals from the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners are triggered.

The crash sensors in the vehicle continuously supply measured values to the control unit. From these signals it calculates whether an impact requires triggering, and it controls the appropriate restraint elements. This is not only about the emergency, because the wiring and the seatbelt pretensioners are also checked continuously in the background.

If the unit reports a fault, it switches on the airbag warning light in the instrument cluster and stores the fault in the memory. After a crash, it also secures crash data and then locks itself.

Why does the control unit 77960-T0A-Q010-M4 fail?

Stored crash data from an accident is the most common cause of the 77960-T0A-Q010-M4 failing, even if no airbag has deployed; other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be deleted with a normal diagnostic tool, and that is precisely why the fault persists. Airbag24 deletes it as part of the repair.

With the other causes, electronic components age, solder joints can go cold, and moisture or corrosion attack the plug connections.

Voltage spikes also belong here, for example from a weak battery or a jump start.

How can you tell that the 77960-T0A-Q010-M4 is defective?

A defect in the 77960-T0A-Q010-M4 shows on the airbag warning light in the instrument cluster, which stays on permanently or intermittently, on a fault message, on a missing connection to the diagnostic tool and on a fault memory that cannot be cleared.

• The airbag warning light stays on permanently or intermittently.
• A fault message appears in the instrument cluster.
• The diagnostic tool does not get a connection to the control unit.
• The fault memory cannot be cleared.

Airbags and seatbelt pretensioners may then fail to trigger in an emergency. The light is therefore a sign you should not ignore, but have checked promptly.

Which vehicles is the 77960-T0A-Q010-M4 fitted in?

The 77960-T0A-Q010-M4 is fitted in these vehicles: Honda CR-V 4 RM (2012-2018).

The following overview lists the vehicles stored for this part number.

• Honda CR-V 4 RM (2012-2018)

Before you start, compare the part number on the label of the removed unit with this page. This only ensures that you have the correct control unit. Have the fault memory read out before removal, because it shows whether the control unit itself or 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-T0A-Q010-M4 work?

You first have the fault memory read out and enclose the log with the order. Then disconnect the battery and only then remove the control unit 77960-T0A-Q010-M4; afterwards create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces worn components, deletes the stored crash data and carries out a function test. Your own unit is then returned to you.

Checking, repairing and testing at Airbag24 should be allowed for 3–4 working days as a rule.

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-T0A-Q010-M4 get to Airbag24?

The 77960-T0A-Q010-M4 reaches Airbag24 either as a parcel or with a UPS collection booked for an extra charge; after the repair, Airbag24 sends it back by UPS.

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