Airbag control unit with part number 89170-52A70

What does the airbag control unit 89170-52A70 do?

The airbag control unit 89170-52A70 coordinates the restraint system (SRS) for Toyota. In a collision it reads the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered.

In addition, monitoring runs continuously. If the control unit detects a fault, it passes this on as a warning via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. The lock is only lifted by a repair.

Why does the control unit 89170-52A70 fail?

Stored crash data is the most common cause on the 89170-52A70, even if no airbag has triggered. A normal diagnostic tool cannot remove this data. Aged components, cold solder joints, corrosion at plug connections, moisture and voltage spikes can also contribute.

The crash data remains until it is erased during a repair. Airbag24 carries out this erasure as part of the work on the unit.

The other causes are technical in nature. Electronic components age, solder joints can develop contact problems, and moisture attacks the contacts. A weak battery or a jump start can also produce voltage spikes that stress the unit.

How can you tell that the 89170-52A70 is defective?

The airbag warning light in the instrument cluster lights up permanently or only intermittently. In addition an error message appears in the instrument cluster, while the diagnostic tool cannot establish a connection to the 89170-52A70.

This combination of warning light, message and missing connection indicates a fault that must be clarified. Even a single one of these signs is reason enough to have the system checked.

In an emergency, airbags and seatbelt pretensioners may then not trigger. Therefore do not wait, but arrange a check.

Which vehicles is the 89170-52A70 fitted in?

The 89170-52A70 is fitted in these vehicles: Toyota Yaris XP90 (2005-2009) and XP90 Facelift (2009-2011). The part number on the label of the removed unit serves for comparison.

These vehicles are assigned to the part number:

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

Comparing the part number only confirms that you have the right unit in front of you. Before that, have the fault memory read out, because that log alone shows whether the control unit itself is affected or whether a connector or a 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 89170-52A70 work?

At the start the fault memory is read out, and the log is enclosed. Then you disconnect the battery, remove the control unit 89170-52A70 and create the repair order online. Processing at Airbag24 usually takes 3–4 working days.

Then pack the unit carefully and send it in.

On the test bench Airbag24 inspects the unit, renews defective components and erases the stored crash data, then carries out a functional test. Afterwards your own unit goes back. 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 89170-52A70 get to Airbag24?

The 89170-52A70 arrives at Airbag24 as a parcel, or you book a UPS collection for an extra charge. Returns after the repair are sent by UPS.

Enclose the printed repair order in the parcel, and pack the unit shockproof.