Airbag control unit with part number 89170-47620

What does the airbag control unit 89170-47620 do?

The airbag control unit 89170-47620 forms the central control unit of the SRS restraint system in Toyota. It processes the messages from the crash sensors, selects within milliseconds in a collision which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit detects faults itself and displays them via the airbag warning light in the instrument cluster. A fault message in the instrument cluster adds to this signal.

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

Why does the control unit 89170-47620 fail?

Stored crash data from an accident is the most common cause for the 89170-47620, even if no airbag has deployed. Ageing electronics, cold solder joints, moisture and corrosion at plug connections and voltage spikes also come into play.

Crash data remains stored, and a normal diagnostic tool does not make it disappear. This is precisely why a simple test does not eliminate the problem.

Over time, components age, solder joints can break under load, and moisture makes contacts corrode. Excessive voltages, as from a weak battery or when starting with an external power source, also stress the electronics.

How can you tell that the 89170-47620 is defective?

The airbag warning light in the instrument cluster lights up on the 89170-47620 permanently or flickers intermittently. Added to this are a fault message, a failed connection to the diagnostic tool and a fault memory that cannot be cleared. In this state, the airbags and seatbelt pretensioners may not be able to deploy in an emergency.

The warning light is the most important warning sign of the system, because it shows the state directly. Take it seriously.

Regardless of whether it lights up permanently or only intermittently, have the condition checked. A fault memory that cannot be cleared shows that the system has registered something.

Which vehicles is the 89170-47620 fitted in?

The 89170-47620 is fitted in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022).

The known applications of the unit are listed in this overview:

• Toyota Prius IV XW50 (2015-2018)
• Toyota Prius IV XW50 Facelift (2018-2022)

Compare the part number on the label of the removed control unit with this page. This establishes that it is the correct unit, nothing more. Also have the fault memory read out before removal, because only this log shows whether the control unit is defective or whether a connector or cable is responsible for the fault.

For the same vehicles, we also repair control units with the part numbers 89170-47030, 89170-47611.

How does the repair of the 89170-47620 work?

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery and only afterwards remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. Your own unit is then 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 89170-47620 get to Airbag24?

You send the 89170-47620 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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