Airbag control unit with part number 89170-52A30

What does the airbag control unit 89170-52A30 do?

The airbag control unit 89170-52A30 is the control unit of the SRS system at Toyota. It evaluates the sensor data and, in an accident, specifically triggers the matching airbags and seatbelt pretensioners.

It also checks the system during operation and reports faults via the airbag warning light. After an accident, it stores crash data and locks itself.

The airbags and seatbelt pretensioners depend on the evaluation by this unit, which is why its function is crucial for the entire system.

Why does the control unit 89170-52A30 fail?

Stored crash data after an accident is the most common cause, even without an airbag firing; a normal diagnostic tool cannot remove it. Aged electronics, cold solder joints, moisture and corrosion on plugs, and voltage spikes come on top.

Crash data stays stored in the control unit after an accident, even if no airbag has fired. An ordinary diagnostic tool cannot delete it; Airbag24 takes that over during the repair.

The remaining causes concern the electronics themselves or their connections. Components can age, solder joints can stay cold, and moisture or corrosion affects connections. Voltage spikes, for example from a weak battery or jump-starting, round off the picture.

How can you tell that the 89170-52A30 is defective?

The airbag warning light in the instrument cluster lights up permanently or at times as soon as something is wrong with the 89170-52A30. It is accompanied by error messages, a diagnostic tool without connection, and a fault memory that cannot be cleared.

In a real emergency, airbags and seatbelt pretensioners may then fail to deploy. The light shows that the control unit has detected a fault.

Have such an indication clarified promptly.

Which vehicles is the 89170-52A30 fitted in?

The 89170-52A30 is installed in these vehicles: Toyota Yaris XP90 (2005-2009) and XP90 Facelift (2009-2011).

The vehicles assigned to it are shown in the following list:

• Toyota Yaris XP90 (2005-2009)
• Toyota Yaris XP90 Facelift (2009-2011)

Comparing the part number on the label with this page is still worthwhile, because it confirms that the removed unit matches this page. Whether the control unit is defective, or whether a plug or cable is behind it, is only clarified by the fault memory, which you should have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 212986-105, 212986-110, 220749-101, 89170-0D170, 89170-0D230, 89170-0D440.

How does the repair of the 89170-52A30 work?

First, have the fault memory read out and enclose the log, then disconnect the battery. Only then remove the control unit 89170-52A30, create the repair order online and send the well-packed unit off. At Airbag24, processing usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, repairs the defects found on the components, deletes the stored crash data and carries out a functional test. Afterwards, your own unit is returned 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 89170-52A30 get to Airbag24?

The control unit 89170-52A30 reaches Airbag24 as a parcel, or, if you prefer collection, you book a UPS collection for an additional charge. After the repair, Airbag24 returns it via UPS.

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