Airbag control unit with part number 89170-47600

What does the airbag control unit 89170-47600 do?

The airbag control unit 89170-47600 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors and decides in an accident which airbags and seatbelt pretensioners are triggered. It reports faults in the system via the airbag warning light.

The control unit monitors the entire system continuously, not only at the moment of impact. The triggering decision is made in a very short time, and the evaluation is designed for that speed.

After an accident it stores crash data and locks itself. This section says no more about it; the following sections explain causes and process.

Why does the control unit 89170-47600 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. This data cannot be erased with a normal diagnostic tool; Airbag24 handles the erasure during the repair. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage peaks.

Crash data is created even when no airbag was triggered in the accident, and it stays stored in the unit until it is removed.

The other causes are of a general nature. Electronics age, solder joints can be cold, and moisture or corrosion attack the connectors. Voltage peaks, for example from a weak battery or a jump start, can also harm the electronics.

How can you tell that the 89170-47600 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. In addition there is an error message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The warning light belongs to the warning system of the restraint system and must not be overlooked.

So have the fault read out promptly and checked, rather than ignoring the light.

Which vehicles is the 89170-47600 fitted in?

The control unit 89170-47600 belongs to Toyota. It is fitted in these vehicles: Toyota Prius IV XW50 (2015-2018) and IV XW50 Facelift (2018-2022).

The assignment follows from the list below.

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

Before removal, the following steps make sense. Compare the part number on the label of the unit with this page, because that only confirms that it is the right unit. Also have the fault memory read out beforehand, because only that shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-47601, 89170-47610, 89170-47611, 89170-47620, 89170-47621, 89170-47630.

How does the repair of the 89170-47600 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the well-packed unit in. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is first examined on the test bench. Defective components are repaired, stored crash data is erased and a function test is carried out before your own unit goes back to you.

The order of steps on the vehicle is fixed for safety reasons: read out first, disconnect next, remove last.

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 89170-47600 get to Airbag24?

You send the unit as a parcel, or book a UPS collection. After the repair, Airbag24 sends it back to you by UPS.

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