Airbag control unit with part number 89170-47B50

What does the airbag control unit 89170-47B50 do?

The airbag control unit 89170-47B50 coordinates the restraint system (SRS) of Toyota. It reads the crash sensors and decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners. It also checks the system constantly and indicates faults via the airbag warning light.

Occurring faults are stored in the fault memory, which a diagnostic tool can read out.

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

Why does the control unit 89170-47B50 fail?

The most common cause for the 89170-47B50 is stored crash data, even if no airbag has triggered. They cannot be removed with a normal diagnostic tool. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The crash data remain stored in the unit after the accident. Airbag24 erases them during the repair.

Further triggers at a glance:

• Ageing of components in the electronics
• Solder joints with cold spots
• Dampness and rust in the plugs
• Voltage spikes with a weak battery or jump-starting

How can you tell that the 89170-47B50 is defective?

A first sign of the condition of the 89170-47B50 is the airbag system warning light. It either stays on permanently or comes on at intervals. Messages in the instrument cluster, connection problems with the diagnostic tool and a fault memory that cannot be emptied are added. In an emergency, airbags and seatbelt pretensioners may not trigger.

The following signs point to a problem:

• Warning light on permanently or active at intervals
• Message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be emptied

The light is the system's own signal. If it is shown, an inspection is advisable.

Which vehicles is the 89170-47B50 fitted in?

The control unit 89170-47B50 is fitted in these vehicles: Toyota Prius V XW60 (from 2022). A cross-check of the part number on the removed unit with this page confirms the assignment.

These models are stored:

• Toyota Prius V XW60 (from 2022)

In addition, the fault memory must be read out first, because only then does it become visible whether the control unit itself is defective or whether a plug or cable lies behind it. You can carry out the label comparison independently of this.

For the same vehicles, we also repair control units with the part numbers 89170-47030, 89170-47860.

How does the repair of the 89170-47B50 work?

The repair begins with reading out the fault memory and attaching the log. Then you disconnect the battery and only then remove the 89170-47B50. Next you create the repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

This sequence is mandatory for safety reasons.

Airbag24 examines the unit on the test bench, replaces defective components, erases crash data and carries out a function test. The unit is then sent back to you.

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 89170-47B50 get to Airbag24?

You can send the control unit 89170-47B50 yourself as a parcel, or alternatively UPS collects it for an extra charge. Airbag24 returns it to you by UPS after the repair.

The printed repair order belongs in the parcel. The control unit must be packed shock-proof.