Airbag control unit with part number 89170-47101

What does the airbag control unit 89170-47101 do?

The airbag control unit 89170-47101 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 within milliseconds which airbags and seatbelt pretensioners are triggered.

During normal driving it monitors the entire system continuously. If it detects a fault, it reports it via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-47101 fail?

With the 89170-47101, the most common cause after an accident is stored crash data, even if no airbag has triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. They remain stored in the control unit until they are removed during the repair.

Components age, solder joints can become cold, and voltage spikes occur, for example, with a weak battery or when a jump start is connected.

How can you tell that the 89170-47101 is defective?

On the 89170-47101, signs may include an airbag warning light that stays on permanently or intermittently, an error message in the instrument cluster and a diagnostic tool without connection to the control unit. In addition, the fault memory cannot be erased. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

• Airbag warning light in the instrument cluster stays on permanently or intermittently
• Error message in the instrument cluster
• The diagnostic tool gets no connection to the control unit
• The fault memory cannot be erased

If the warning light comes on, have the fault memory read out promptly. The light is the signal that the system itself has detected a fault.

Which vehicles is the 89170-47101 fitted in?

The airbag control unit 89170-47101 is intended for Toyota. It is fitted in these vehicles: Toyota Prius III XW30 (2009-2012) and III XW30 Facelift (2012-2016).

The vehicles at a glance:

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

Before removal, the following steps are worthwhile. First compare the part number on the label of the removed unit with this page; this only ensures that you have the right unit in front of you. Also have the fault memory read out, because only the result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-47110, 89170-47B60.

How does the repair of the 89170-47101 work?

First read out the fault memory and attach the log, then disconnect the battery and only then remove the control unit 89170-47101. Afterwards create a repair order online and send the unit in well packed. Airbag24 then examines the unit and repairs it.

The order of these steps is binding for safety reasons. Only once the battery is disconnected may the control unit be removed.

At Airbag24 the unit is examined on the test bench. Defective components are replaced where necessary, stored crash data are erased and a function test is carried out. Processing at Airbag24 usually takes 3–4 working days.

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 89170-47101 get to Airbag24?

You send the control unit 89170-47101 in as a parcel, or you book UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Place the printed repair order in the parcel and pack the unit shock-proof.