Airbag control unit with part number 89170-47090

What does the airbag control unit 89170-47090 do?

The control unit 89170-47090 coordinates the restraint system (SRS) for Toyota. It checks the signals of the crash sensors and decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners. At the same time it monitors the system and displays faults via the airbag warning light.

Monitoring is constant, even when no warning is lit. The unit checks connections, supply voltage and the activation of the trigger stages.

After an accident the unit stores crash data and locks itself.

Why does the control unit 89170-47090 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is the record of an accident event that the control unit keeps in memory.

The other causes concern the electronics. Aging components and cold solder joints can lead to failures, moisture and corrosion attack plug connections, and voltage spikes arise, for example, from a weak battery or a jump start.

How can you tell that the 89170-47090 is defective?

The defect shows in the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and in an error message in the instrument cluster. Further signs include a diagnostic tool without connection and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may possibly fail to deploy.

Pay particular attention to the following signs:

• warning light on permanently
• warning light on intermittently
• error message in the instrument cluster
• diagnostic tool without connection to the control unit
• fault memory cannot be cleared

As soon as one of these signs appears, have the restraint system checked. Do not wait to see whether the problem resolves itself.

Which vehicles is the 89170-47090 fitted in?

The control unit 89170-47090 is fitted in these vehicles: Toyota Prius III XW30 (2009-2012) and III XW30 Facelift (2012-2016). If you want to compare your own vehicle with these details, you will find it in the list below.

Here are the vehicles for which the part number is known to us.

• Toyota Prius III XW30 (2009-2012)
• Toyota Prius III XW30 Facelift (2012-2016)

First, it is advisable to compare the part number on the label of the removed unit with this page; that only confirms that the unit is correct. Have the fault memory read out beforehand, because this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-47100, 89170-47101, 89170-47110, 89170-47111, 89170-47120, 89170-47140.

How does the repair of the 89170-47090 work?

Have the fault memory read out first and attach the log, before you disconnect the battery and remove the control unit. Then create the repair order online and send the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 first examines the unit on the test bench. Defective components are then repaired, crash data erased and a function test carried out. The own unit then comes back to you.

The safety sequence during removal is important for you and the restraint system.

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 89170-47090 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. Returns after repair are handled by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shock-resistantly.