Airbag control unit with part number 77960-TF0-Z420-M3

What does the airbag control unit 77960-TF0-Z420-M3 do?

The airbag control unit 77960-TF0-Z420-M3 forms the central control of the SRS restraint system for Honda in the vehicle. It processes the sensor signals and determines within milliseconds in a crash which airbags and seatbelt pretensioners are triggered.

In addition, the unit monitors the function of the entire system and reports faults via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 77960-TF0-Z420-M3 fail?

Crash data stored after an accident is the most common cause, even if no airbag has deployed. A standard diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture, corrosion on plug connections and voltage spikes are further possible causes.

Airbag24 erases the crash data during the repair. Storing it is not a defect in itself but a consequence of the accident, which is precisely why the unit stays locked after a crash.

Voltage spikes occur, for example, with a weak battery or when jump-starting, and can damage the electronics. Which cause applies in your case will only become clear during the check.

How can you tell that the 77960-TF0-Z420-M3 is defective?

A defect in the 77960-TF0-Z420-M3 shows itself when the airbag warning light in the instrument cluster lights up permanently or intermittently. An error message also appears, the diagnostic tool receives no connection to the control unit, and the fault memory cannot be cleared.

After the ignition is switched on, the warning light briefly checks the system. If it stays on afterwards, there is a problem that you should have clarified.

While the fault persists, airbags and seatbelt pretensioners may fail to deploy in an emergency. Therefore take every warning seriously and act promptly.

Which vehicles is the 77960-TF0-Z420-M3 fitted in?

The 77960-TF0-Z420-M3 is fitted in these vehicles: Honda Jazz GE (2008-2015).

You will find the matching vehicles in this list:

• Honda Jazz GE (2008-2015)

Before sending, compare the part number on the label of the removed unit with this page, so that you can be sure you have the right unit. Also have the fault memory read out, because only this record shows whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 5WK43461, 77960-SAA-G821-M1, 77960-SEG-G821-M1, 77960-TF0-G820-M3, 77960-TF0-G821.

How does the repair of the 77960-TF0-Z420-M3 work?

For the repair of the 77960-TF0-Z420-M3, the fault memory is read out first and the log is attached. Only then do you disconnect the battery and remove the control unit. Next, create a repair order online and pack the unit well before you send it in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. The customer's own unit then goes back to them.

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-TF0-Z420-M3 get to Airbag24?

You can send the control unit 77960-TF0-Z420-M3 in as a parcel, or have it collected by UPS for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order belongs in the parcel, and the unit should be packed shock-proof.