Airbag control unit with part number 89170-BZ140

What does the airbag control unit 89170-BZ140 do?

In the restraint system (SRS) of Toyota, the airbag control unit 89170-BZ140 takes over central control. It reads the crash sensors, decides within the millisecond range whether airbags and seatbelt pretensioners are triggered, and shows faults via the airbag warning light.

The unit also checks the function of the entire system continuously. In the event of an accident it records crash data and locks itself.

Why does the control unit 89170-BZ140 fail?

Most often the cause lies in stored crash data, even if no airbag was triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage peaks, for example from a weak battery or a jump start, are also considered.

A normal diagnostic tool cannot remove these entries. For this reason the fault remains even after a simple restart of the system.

The other causes concern solder joints, plugs and components that are hard to judge from the outside. This is why only the evaluation of the fault memory gives reliable clues.

Voltage peaks arise, for example, when the battery is weakened or a jump start is carried out improperly.

How can you tell that the 89170-BZ140 is defective?

A defect shows up at the airbag warning light in the instrument cluster, which lights up continuously or intermittently. In addition there may be fault messages, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared.

• The airbag warning light lights up continuously or intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool finds no connection to the control unit.
• The fault memory cannot be cleared.

With such a finding, airbags and seatbelt pretensioners may possibly not trigger in an emergency. Have the warning clarified promptly rather than ignoring it.

Which vehicles is the 89170-BZ140 fitted in?

The control unit 89170-BZ140 is fitted in these vehicles: Toyota Avanza F650 (2011-2015).

The list of vehicles follows here:

• Toyota Avanza F650 (2011-2015)

On the one hand, compare the part number on the label of the removed unit with this page, which only confirms that it is the correct unit. On the other hand, have the fault memory read out before removal, because this result 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 17952812-928112, 17952815-928143, 89170-BZ440.

How does the repair of the 89170-BZ140 work?

First read out the fault memory and enclose the log; then disconnect the battery and remove the control unit 89170-BZ140. Afterwards create a repair order online and send the unit in well packed. At Airbag24, testing, repair and checking take 3–4 working days as a rule.

The sequence matters, because the battery must already be disconnected before removal.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit is returned 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-BZ140 get to Airbag24?

You send the control unit to Airbag24 as a parcel or book a UPS collection for an extra charge. The return of your own repaired unit is made by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof.