Airbag control unit with part number 89170-BZ240

What does the airbag control unit 89170-BZ240 do?

The airbag control unit 89170-BZ240 manages the restraint system for Toyota. It reads the crash sensors, determines the airbags and seatbelt pretensioners to be triggered in an impact and monitors the system permanently.

If it detects a fault, the airbag warning light in the instrument cluster lights up. After an accident the unit creates crash data and locks itself.

The control unit is designed for emergencies and works in the background, without anything about it being noticeable in everyday driving.

Why does the control unit 89170-BZ240 fail?

Stored crash data causes the most common fault on the 89170-BZ240, even if no airbag has deployed. Further causes are ageing electronics, cold solder joints, moisture at plug connections and voltage spikes.

The crash data remains in the unit if it is not repaired after the accident. A normal diagnostic tool does not erase it, so the fault message persists.

The other causes concern components and connections. Over time components age, solder joints can turn cold, moisture and corrosion affect plug connections, and voltage spikes, for example from a weak battery or a jump start, additionally strain the electronics.

How can you tell that the 89170-BZ240 is defective?

A defect in the 89170-BZ240 shows itself through the airbag warning light, through fault messages, through a missing connection to the diagnostic tool and through a fault memory that cannot be cleared.

• airbag warning light on permanently or intermittently
• fault messages in the instrument cluster
• diagnostic tool cannot find the control unit
• fault memory cannot be cleared

Such a fault may mean that airbags and seatbelt pretensioners fail to deploy in an emergency. Look into the display promptly.

Which vehicles is the 89170-BZ240 fitted in?

The control unit 89170-BZ240 is fitted in these vehicles: Toyota Avanza F650 (2011-2015).

The list shows the vehicles recorded in the Airbag24 database for this part number.

• Toyota Avanza F650 (2011-2015)

Comparing the part number on the label of the removed unit with this page confirms that it is the correct unit. Have the fault memory read out beforehand, because only this log 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-BZ240 work?

Before removal, have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the 89170-BZ240. Afterwards create the repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the control unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. The unit then goes back to you.

The 3–4 working days relate solely to the work at Airbag24, not to your steps or the shipping.

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-BZ240 get to Airbag24?

You send the control unit 89170-BZ240 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

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