Airbag control unit with part number 89170-BZ220

What does the airbag control unit 89170-BZ220 do?

The airbag control unit 89170-BZ220 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the impact sensors, decides in a crash within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. Detected faults are shown via the airbag warning light.

The unit works in a fixed sequence: measured values come in, are compared continuously and, in the event of a severe impact, the firing commands are carried out immediately.

After an accident it stores crash data and locks itself. Whenever a fault is suspected, it is therefore worth looking at the fault memory.

Why does the control unit 89170-BZ220 fail?

The most common cause is stored crash data from an accident, even if no airbag has deployed; an ordinary diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump-start.

Airbag24 erases the crash data during the repair. The other causes act in very different ways: ageing and corrosion slowly, voltage spikes suddenly.

Which cause actually applies to the unit cannot be determined from the outside.

How can you tell that the 89170-BZ220 is defective?

A defect on the 89170-BZ220 shows up as the airbag warning light, as fault messages, or when the diagnostic tool cannot reach the control unit. In an emergency, airbags and seatbelt pretensioners may then not deploy.

These signs are:

• airbag warning light lights up permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool does not receive a connection to the control unit
• fault memory cannot be cleared

The warning light is a signal you should keep an eye on during every journey.

Which vehicles is the 89170-BZ220 fitted in?

The 89170-BZ220 is fitted in these vehicles: Toyota Avanza F650 (2011-2015).

The list shows the vehicles stored for this part number.

• Toyota Avanza F650 (2011-2015)

Comparing the part number on the label of the removed unit with this page only shows that it is the correct unit. In addition, have the fault memory read out beforehand, because only this log shows whether the control unit is faulty or whether a plug 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-BZ220 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send in the well-packed unit. Airbag24 normally needs 3–4 working days for testing, repairing and checking.

On the test bench, Airbag24 examines the unit. Defective components are repaired or replaced, the stored crash data is erased and a function test is carried out before your own unit is sent back.

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-BZ220 get to Airbag24?

You send the control unit 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 into the parcel and pack the unit shock-resistant.