Airbag control unit with part number 89170-47621

What does the airbag control unit 89170-47621 do?

The airbag control unit 89170-47621 is part of the restraint system (SRS) of Toyota and controls it. It reads out the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners fire, and monitors the system continuously. After an accident it stores crash data and locks itself.

The unit reports a fault in the system via the airbag warning light in the instrument cluster. The monitoring runs in the background, so you do not need to notice anything of it during normal driving as long as everything is in order.

Why does the control unit 89170-47621 fail?

The most common cause on the 89170-47621 is the storage of crash data after an accident, even if no airbag was triggered. This data cannot be cleared with a normal diagnostic tool. Besides this, ageing electronics, moisture and voltage spikes play a role.

Airbag24 deletes the crash data during the repair. The remaining causes at a glance:

• Ageing of electronic parts
• Solder joints with cold spots
• Wetness and rust at plug connections
• Voltage spikes, for example from a weak battery or a jump start

How can you tell that the 89170-47621 is defective?

The airbag warning light in the instrument cluster lights up on the 89170-47621 permanently or intermittently. In addition, a fault message may appear in the instrument cluster, the diagnostic tool may find no connection to the control unit, or the fault memory cannot be cleared.

As long as these signs persist, airbags and seatbelt pretensioners may fail to trigger in an emergency. The warning light is therefore a clear signal that you should have checked promptly.

Which vehicles is the 89170-47621 fitted in?

The 89170-47621 was fitted by Toyota in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022).

A clear allocation is provided by the list:

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

Comparing the part number on the unit with this page only confirms that it is the right unit. The fault memory, on the other hand, gives you the answer as to whether the control unit itself or a cable is behind the fault. So have it read out before removal.

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

How does the repair of the 89170-47621 work?

For the 89170-47621, first have the fault memory read out and enclose the log. Then disconnect the battery before you remove the control unit. Afterwards create the repair order online and send the unit in well packed.

At Airbag24 the unit is checked, defective components are repaired, crash data is deleted and a functional test is carried out. You should allow 3–4 working days for processing 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 89170-47621 get to Airbag24?

Shipping as a parcel is possible, as is a UPS collection for an extra charge. The repaired control unit 89170-47621 then comes back to you by UPS.

Pack the printed repair order into the parcel and pack the unit shockproof.