Airbag control unit with part number 89170-47691

What does the airbag control unit 89170-47691 do?

For Toyota, the airbag control unit 89170-47691 is the central unit of the SRS restraint system. It analyses the signals from the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners to trigger. After an accident, it stores crash data and locks itself.

In normal operation, the unit monitors all components of the system and records irregularities in the fault memory.

The airbag warning light in the instrument cluster indicates faults.

Why does the control unit 89170-47691 fail?

The most common cause is crash data from an accident that remains in the unit, even if no airbag has deployed; normal diagnostic tools do not erase it. Otherwise, aged components, cold solder joints, moisture, corrosion and voltage spikes may be the cause.

Crash data is a fixed part of the memory and cannot be removed by the usual means. Airbag24 erases it as part of the repair.

Aged components and cold solder joints develop over time. Moisture and corrosion attack the contacts, and voltage spikes arise, for example, from a weak battery or when a jump-start cable is connected.

How can you tell that the 89170-47691 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and an error message is one of the signs. In addition, the diagnostic tool fails to establish a connection and the fault memory cannot be cleared.

In this situation, airbags and seatbelt pretensioners may not fire in an emergency. This applies regardless of whether the vehicle otherwise runs without any visible problem.

A light that does not go out is a clear reason to have the fault memory read out.

Which vehicles is the 89170-47691 fitted in?

The 89170-47691 is fitted in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022). The information is based on the status of our data on this control unit.

The overview shows the vehicles in our data:

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

You compare the part number on the label of the removed unit with the label check on this page. It only confirms the identity of the unit. Have the fault memory read out beforehand, because the log shows whether the control unit itself or a plug or cable is the cause.

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

How does the repair of the 89170-47691 work?

First, read out the fault memory and enclose the log, then disconnect the battery. After that, remove the control unit, create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and runs a function test. The unit is then returned to you.

Processing at Airbag24 usually takes 3–4 working days, referring to testing, repair and function testing. 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 89170-47691 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge; after the repair, Airbag24 returns it by UPS.

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