Airbag control unit with part number 89170-BZ600

What does the airbag control unit 89170-BZ600 do?

The airbag control unit 89170-BZ600 coordinates the restraint system (SRS) of Toyota in the vehicle. It processes the signals from the crash sensors, decides in an accident within milliseconds on the triggering, and monitors the system continuously. After an accident it stores crash data and locks itself.

If the unit detects a fault, it shows this via the airbag warning light in the instrument cluster.

In this way the state of the system stays recognisable to the driver, even without the driver having to measure anything.

Why does the control unit 89170-BZ600 fail?

Stored crash data is the most common cause with the 89170-BZ600, and this is so even when no airbag has triggered. In addition there are ageing components, cold solder joints, moisture at plug connections and voltage spikes.

Stored crash data remains in the unit until the repair removes it. A normal diagnostic tool is not sufficient for this; Airbag24 erases the data during the repair.

The other causes concern components and connections. Electronics age, solder joints can go cold, and moisture attacks plug connections. Voltage spikes arise, for example, with a weak battery or when a jump start is used.

How can you tell that the 89170-BZ600 is defective?

A defect in the 89170-BZ600 shows up as the airbag warning light, which lights up continuously or intermittently, and as fault messages in the instrument cluster.

These signs can be summarised as follows:

• warning light in the instrument cluster lights up continuously or intermittently
• fault message in the instrument cluster about a malfunction
• no communication between diagnostic tool and control unit
• fault memory remains after an attempt to clear it

With such signs, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

Which vehicles is the 89170-BZ600 fitted in?

The airbag control unit 89170-BZ600 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023).

The following vehicles are on record for this part number:

• Toyota Avanza F650 Facelift (2015-2023)

A comparison of the part number on the label of the removed unit with this page only confirms that it is the right unit. You should have the fault memory read out before removal, because only that 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-BZ600 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the 89170-BZ600. Processing at Airbag24 usually takes 3–4 working days.

Afterwards create the repair order online and pack the unit well. Airbag24 checks it on the test bench, repairs defective components, erases the crash data and carries out a functional test.

The unit then goes back to you. The stated time applies exclusively to checking, repairing and testing at Airbag24.

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-BZ600 get to Airbag24?

You send the 89170-BZ600 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends the unit back by UPS.

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