Airbag control unit with part number 89170-BZ690

What does the airbag control unit 89170-BZ690 do?

The airbag control unit 89170-BZ690 controls the SRS restraint system for Toyota. From the crash sensor data it works out which airbags and seatbelt pretensioners are triggered in an accident, and it does so within milliseconds.

It also monitors the entire system constantly and shows faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. The lock is only lifted by a repair.

Why does the control unit 89170-BZ690 fail?

Stored crash data is the most common cause on the 89170-BZ690, even if no airbag has been triggered. A normal diagnostic tool cannot erase this data. Added to this are ageing components, cold solder joints, moisture at the plugs and voltage spikes.

Airbag24 removes the crash data during the repair, and you do not need to take any measures of your own for this.

The other triggers come from ageing and environmental influences. Electronics change over time, solder joints can go cold, and moisture or corrosion affect the contact. A weak battery or a jump start can also generate voltage spikes.

How can you tell that the 89170-BZ690 is defective?

A defect on the 89170-BZ690 shows through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Other signs also point to it.

The signs in detail:

• airbag warning light, permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool does not find the control unit
• fault memory cannot be cleared

In a crash, airbags and seatbelt pretensioners may then fail to trigger. Please have the finding checked promptly.

Which vehicles is the 89170-BZ690 fitted in?

The airbag control unit 89170-BZ690 is fitted in these vehicles: Toyota Avanza F650 Facelift (2015-2023). The comparison is made using the part number on the label of the removed unit.

The vehicles of this assignment are listed here:

• Toyota Avanza F650 Facelift (2015-2023)

Comparing the part number confirms the correct unit, but says nothing about the cause. Having the fault memory read out beforehand 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-BZ690 work?

The start is made by reading out the fault memory and attaching the record. Then you disconnect the battery, remove the control unit 89170-BZ690 and create a repair order online before you pack the unit carefully. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and replaces defective components. The crash data is then erased and a functional test is carried out.

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-BZ690 get to Airbag24?

The control unit 89170-BZ690 is sent to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair it is sent back to you by UPS.

Put the printed repair order into the parcel and pack the unit so that it is shock-resistant.