Airbag control unit with part number 77960-TAA-Z111-M4

What does the airbag control unit 77960-TAA-Z111-M4 do?

The airbag control unit 77960-TAA-Z111-M4 works as the central control unit of the restraint system (SRS) in Honda vehicles. It processes the readings from the crash sensors, makes the decision on airbags and seatbelt pretensioners within milliseconds of an impact, and checks the system permanently. It shows detected faults via the airbag warning light.

The crash sensors are connected to the unit by cables. From their signals, the control unit calculates whether the threshold for a trigger has been exceeded.

After an accident the unit stores crash data and then locks itself. In this function it also serves as an event memory.

Why does the control unit 77960-TAA-Z111-M4 fail?

The most common cause is crash data stored in the unit after an accident, even if no airbag was triggered. A usual diagnostic tool does not make it disappear. Other causes include aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes from the battery or jump-starting.

Crash data is hardly noticeable in everyday use, because the vehicle keeps driving normally. The entry remains in the unit, however, until Airbag24 removes it during the repair.

The other causes concern the unit itself and its connections. A loose plug connection can trigger a fault that resembles a defective unit.

How can you tell that the 77960-TAA-Z111-M4 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently whenever a fault exists in the 77960-TAA-Z111-M4. In addition, an error message appears in the instrument cluster, while the diagnostic tool cannot establish a connection to the control unit. A fault memory that cannot be cleared also belongs to the picture.

In a crash, the airbags and seatbelt pretensioners in the 77960-TAA-Z111-M4 may possibly not trigger. The light therefore shows the state of the system directly, and when it comes on, a check is clearly called for.

Which vehicles is the 77960-TAA-Z111-M4 fitted in?

The 77960-TAA-Z111-M4 is fitted in these vehicles: Honda Stepwgn 5th generation (2015-2022).

The list shows the vehicles for which this part number is on record.

• Honda Stepwgn 5th generation (2015-2022)

First compare the part number on the label of the unit with this page. That only confirms that it is the right unit. Whether the control unit is defective or a connector or cable is the cause can only be established from the fault memory read out beforehand.

How does the repair of the 77960-TAA-Z111-M4 work?

You have the fault memory read out and keep the log before you disconnect the battery. Then you remove the 77960-TAA-Z111-M4, create the repair order online and pack the unit well. At Airbag24, checking, repairing and testing usually takes 3–4 working days.

At Airbag24 the unit is examined on the test bench, defective components are repaired and the crash data is erased. A function test follows, and then 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-TAA-Z111-M4 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, UPS brings the 77960-TAA-Z111-M4 back. The printed repair order belongs in the parcel.

Choose shock-proof packaging so that the unit arrives undamaged.