Airbag control unit with part number 89170-52A90

What does the airbag control unit 89170-52A90 do?

The airbag control unit 89170-52A90 coordinates the SRS restraint system of Toyota. Based on the crash sensors, it determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered.

During ongoing operation it monitors the system and reports faults via the airbag warning light. Once an accident has been registered, it writes crash data and locks itself.

This makes the unit the central point where all restraint components come together.

Why does the control unit 89170-52A90 fail?

On the 89170-52A90, stored crash data is one of the most common causes, even when no airbag has deployed. Other triggers include aged components, cold solder joints, moisture and corrosion, as well as voltage spikes.

The crash data remain in memory, because a standard diagnostic tool cannot delete them. Airbag24 clears them during the repair.

Aged electronics, cold solder joints and corrosion on connectors develop over time. Voltage spikes occur, for example, with a weak battery or a jump start.

How can you tell that the 89170-52A90 is defective?

Defects on the 89170-52A90 show up as an airbag warning light that stays on permanently or intermittently, as error messages in the instrument cluster, as a lack of contact with the diagnostic tool, and as a fault memory that cannot be cleared.

In such a case, airbags and seatbelt pretensioners may fail to trigger in an emergency.

• Airbag warning light permanently on
• Airbag warning light intermittently on
• Error message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory remains

Which vehicles is the 89170-52A90 fitted in?

The 89170-52A90 is fitted in these vehicles: Toyota Yaris XP90 (2005-2009) and XP90 Facelift (2009-2011).

You can see the models in this list:

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

Matching the part number on the label with this page only confirms that it is the right unit. The deciding factor is the fault memory, which you should have read out beforehand. It 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 212986-105, 212986-110, 220749-101, 89170-0D170, 89170-0D230, 89170-0D440.

How does the repair of the 89170-52A90 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the 89170-52A90. Next, create a repair order online and send the unit in, well packed.

At Airbag24 the unit is checked on the test bench, defective components are replaced, the crash data is deleted and a function test is carried out. Processing usually takes 3–4 working days. Your own unit is then 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 89170-52A90 get to Airbag24?

You send the 89170-52A90 as a package or book a UPS collection for an extra charge. The return after the repair is handled by UPS.

Pack the printed repair order into the package and pack the unit shock-proof.