Airbag control unit with part number 89170-47850

What does the airbag control unit 89170-47850 do?

The airbag control unit 89170-47850 coordinates the restraint system (SRS) for Toyota. It processes the signals from the crash sensors and triggers airbags and seatbelt pretensioners in an accident. After an accident it stores crash data and locks itself.

The decision on deployment is made within fractions of a second, based on the measured deceleration. The system monitors itself continuously.

If the control unit detects a fault, it switches on the airbag warning light so that the fault becomes visible.

Why does the control unit 89170-47850 fail?

Stored crash data is the most common cause in the 89170-47850, and after an accident this applies even when no airbag was triggered. A normal diagnostic tool cannot erase it. Aged components, moisture and corrosion at plug connectors, and voltage spikes, for example from a weak battery or a jump start, are also considered as causes.

The crash data sits inside the control unit itself. For that reason the fault persists even if you connect a diagnostic tool and read out the fault memory.

The other causes concern the electronics and their connections. Electronic components age, cold solder joints become a weak point, and moisture with corrosion attacks plug connectors. Voltage spikes arise, for example, from a weak battery or during a jump-start procedure.

How can you tell that the 89170-47850 is defective?

On the 89170-47850, the following signs above all point to a defect: the airbag warning light, which stays on permanently or intermittently; an error message in the instrument cluster; a missing connection between the diagnostic tool and the control unit; and a fault memory that cannot be cleared.

These signs appear individually or together:

• Airbag warning light stays on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool does not receive a connection to the control unit
• Fault memory cannot be cleared

As long as such a finding exists, airbags and seatbelt pretensioners may fail to deploy in an emergency.

Which vehicles is the 89170-47850 fitted in?

The airbag control unit 89170-47850 is fitted in these vehicles: Toyota Prius V XW60 (from 2022).

Here follows the overview of the vehicles assigned to this part number:

• Toyota Prius V XW60 (from 2022)

Compare the part number on the label of the removed unit with this page, and you will have the correct unit in front of you. Also have the fault memory read out before you remove the unit; 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 89170-47030, 89170-47860.

How does the repair of the 89170-47850 work?

The repair of the 89170-47850 begins with the fault memory being read out and the log being enclosed. Then disconnect the battery, remove the control unit and create a repair order online. Send the unit in well packed. At Airbag24, inspection, repair and functional testing generally take 3–4 working days.

Airbag24 inspects the unit on the test bench, replaces defective components, erases the stored crash data and carries out a functional test. Afterwards your own unit 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 89170-47850 get to Airbag24?

You send the 89170-47850 as a parcel to Airbag24, or you book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS.

Enclose the printed repair order and pack the unit shock-proof.