Airbag control unit with part number 89170-BZ660

What does the airbag control unit 89170-BZ660 do?

The airbag control unit 89170-BZ660 controls the restraint system (SRS) of Toyota. It evaluates the crash sensors and triggers the appropriate airbags and seatbelt pretensioners within milliseconds in an accident. After an accident it stores crash data and locks itself.

The unit monitors the entire system without interruption. It shows faults via the airbag warning light, so that you notice a malfunction.

Only the repair lifts the lock.

Why does the control unit 89170-BZ660 fail?

For the 89170-BZ660, the most common cause is crash data stored after an accident, even without an airbag having triggered. Further causes are aged electronics, cold solder joints, moisture or corrosion at plug connections, and voltage spikes.

A standard diagnostic tool cannot erase this crash data.

• aged electronic components
• cold solder joints
• moisture and corrosion at the plug connections
• voltage spikes, for example from a weak battery or jump-starting

Only the inspection of the unit shows what the cause is in an individual case.

How can you tell that the 89170-BZ660 is defective?

A defect in the 89170-BZ660 shows up as the airbag warning light, which stays on permanently or intermittently, and as an error message. In addition, a diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared.

• Airbag warning light in the instrument cluster stays on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool has no connection to the control unit
• Fault memory cannot be cleared

Airbags and seatbelt pretensioners may not trigger in an emergency if the control unit is faulty. As soon as the warning light indicates something, have the restraint system checked.

Which vehicles is the 89170-BZ660 fitted in?

The airbag control unit 89170-BZ660 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The vehicles at a glance:

• Toyota Avanza F650 Facelift (2015-2023)

(a) Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. (b) Have the fault memory read out beforehand. Only this result shows whether the control unit is defective or whether a connector or 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-BZ660 work?

For the 89170-BZ660, first read out the fault memory and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Work at Airbag24 usually takes 3–4 working days.

Your part comes first: read out the fault memory, disconnect the battery, only then remove the control unit, then create the repair order online and send the unit well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The 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-BZ660 get to Airbag24?

You send the control unit 89170-BZ660 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order in the parcel and pack the unit shock-proof.