Airbag control unit with part number 89170-BZ630

What does the airbag control unit 89170-BZ630 do?

The airbag control unit 89170-BZ630 is the central control unit of the restraint system (SRS) of Toyota. It evaluates crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the entire system continuously.

It shows faults in the system via the airbag warning light in the instrument cluster. After an accident it stores crash data and then locks itself.

It works in the background, but its function decides in an emergency whether the restraint systems react correctly.

Why does the control unit 89170-BZ630 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 causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Crash data is the most common explanation: it is created when the sensors register an impact, and it remains even if no airbag fires. A diagnostic tool cannot remove it while the unit is installed.

Causes that have nothing to do with an accident are also possible. Aged electronics, cold solder joints, and damp or corroded plug connections impair the function.

Voltage spikes, for example from a weak battery or a jump start, form the last group of possible triggers, which can only be narrowed down during the examination.

How can you tell that the 89170-BZ630 is defective?

The airbag warning light in the instrument cluster lights up constantly or only intermittently, a fault message appears, or the diagnostic tool cannot reach the control unit. A fault memory that cannot be cleared also counts. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

The airbag warning light is the most important sign. Whether it stays on permanently or only lights up now and then matters less for the check.

A fault message may also appear in the instrument cluster. If the diagnostic tool does not connect, or the fault memory remains even after an attempt to clear it, this is a further finding.

Have the finding checked promptly, because in an emergency airbags and seatbelt pretensioners may not deploy.

Which vehicles is the 89170-BZ630 fitted in?

The control unit 89170-BZ630 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023). Check whether your car is among them by make and model.

These vehicles are known to us with this part number:

• Toyota Avanza F650 Facelift (2015-2023)

Compare the part number on the label of the removed unit with this page. This way you can be sure it is the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 17952812-928112, 17952815-928143, 89170-BZ440.

How does the repair of the 89170-BZ630 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit. Afterwards create a repair order online and send the unit in, well packed. Processing at Airbag24 usually takes 3–4 working days.

The sequence is set for safety reasons. The control unit is taken out of the vehicle only once the battery has been disconnected.

Airbag24 examines the unit on the test bench, repairs or replaces defective components, erases the crash data and carries out a function test. Your own unit then goes back to you.

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 89170-BZ630 get to Airbag24?

You send the control unit 89170-BZ630 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 unit shockproof.