Airbag control unit with part number 89170-47641

What does the airbag control unit 89170-47641 do?

The airbag control unit 89170-47641 coordinates the restraint system (SRS) in Toyota vehicles. It processes the readings from the crash sensors, decides in fractions of a second in a collision whether airbags and seatbelt pretensioners are triggered, and checks the entire system continuously for faults, which are shown via the airbag warning light.

The control works permanently in the background, even when the engine is running and nothing unusual is happening. It waits for signals and evaluates every state of the connected components.

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

Why does the control unit 89170-47641 fail?

Most often, the cause is crash data stored after an accident, even if no airbag has deployed, because a normal diagnostic tool cannot erase this data. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

The unit registers an impact even when little damage is visible from outside, and it stores the event. The data remains until it is deliberately erased.

The other causes tend to develop gradually. Electronics age, solder joints can go cold, and moisture or corrosion worsens the contact at the plug connections.

Voltage spikes occur, for example, when the battery is weakening or during a jump start from another vehicle.

How can you tell that the 89170-47641 is defective?

A defect shows up as the airbag warning light in the instrument cluster, which stays on permanently or intermittently, as an error message in the instrument cluster, as a lack of connection to the diagnostic tool, and as a fault memory that cannot be cleared. In this case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light on the dashboard is the most obvious sign. It indicates a detected fault in the restraint system, and if it lights up, have the system checked promptly.

An error message in the instrument cluster is also a sign that should be clarified promptly. If the connection to the diagnostic tool fails or the fault memory cannot be emptied, this also points to a fault in the control unit or its surroundings.

Which vehicles is the 89170-47641 fitted in?

The airbag control unit 89170-47641 is fitted in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022).

This part number is assigned to the following vehicles:

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

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Whether the control unit is defective or a plug or a cable is the cause is only clarified by a fault memory read out beforehand.

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

How does the repair of the 89170-47641 work?

First have the fault memory read out and attach the log to the order. Then disconnect the battery and only then remove the control unit. Create a repair order online and send in the well-packed unit. At Airbag24, processing usually takes 3–4 working days.

At Airbag24, the unit is first checked on the test bench. Defective components are repaired, the stored crash data is erased, and finally a function test is carried out. Only then is the unit returned to you.

The order must be observed for safety reasons, even when the removal goes according to plan.

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 89170-47641 get to Airbag24?

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

Place the printed repair order in the parcel. Pack the unit shock-proof so that it arrives undamaged.