Airbag control unit with part number 89170-42E00

What does the airbag control unit 89170-42E00 do?

The airbag control unit 89170-42E00 is the control unit of the restraint system for Toyota. It evaluates signals from the crash sensors, decides in a crash within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It displays faults via the airbag warning light.

After a crash, the unit stores crash data and locks itself. Monitoring continues even when the vehicle is driving without any noticeable problems.

Why does the control unit 89170-42E00 fail?

The most common cause with 89170-42E00 is stored crash data, even if no airbag has deployed. A standard diagnostic tool cannot erase it, but Airbag24 erases it during the repair.

Other causes lie in the electronics themselves: aged components, cold solder joints, and moisture or corrosion in plug connections. Voltage spikes, for example with a weak battery or when starting with a jump start, can also place a load on the electronics.

How can you tell that the 89170-42E00 is defective?

The airbag warning light in the instrument cluster indicates a fault in the 89170-42E00 by lighting up constantly or intermittently. In addition, a fault message appears, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may therefore fail to deploy. Do not wait, but have the vehicle checked promptly.

Which vehicles is the 89170-42E00 fitted in?

The 89170-42E00 is fitted in these vehicles: Toyota bZ4X XC10 (2022-2025) and XC10 Facelift (from 2025).

The vehicles from the list belong to this part number:

• Toyota bZ4X XC10 (2022-2025)
• Toyota bZ4X XC10 Facelift (from 2025)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit. Also have the fault memory read out beforehand, because only the result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-42B60, 89170-42E70.

How does the repair of the 89170-42E00 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Create the repair order online for the 89170-42E00 and send in the well-packed unit. Processing at Airbag24 takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. The unit then goes back 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 89170-42E00 get to Airbag24?

You send the control unit 89170-42E00 as a parcel or book a UPS collection for an extra charge. Airbag24 sends the unit back to you by UPS after the repair.

Put the printed repair order into the parcel and pack the control unit shock-proof.