Airbag control unit with part number 89170-52E00

What does the airbag control unit 89170-52E00 do?

The SRS control unit 89170-52E00 processes the messages from the crash sensors for Toyota. In the event of an impact, it decides within milliseconds which airbags and seatbelt pretensioners to trigger, and it checks the system without interruption. If it detects a fault, it reports it via the airbag warning light.

Sensors, wiring and trigger circuits are monitored continuously, and any faults detected are stored in the fault memory.

After an accident, the unit records crash data and then locks itself. If the warning light is on, you should not ignore the fault memory.

Why does the control unit 89170-52E00 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. Other possible causes include aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or a jump start.

A standard diagnostic tool cannot erase crash data. Airbag24 removes it as part of the repair. The other causes are:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 89170-52E00 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, an error message appears in the instrument cluster, the diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared. In that case, the airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light shows the fault as soon as the control unit detects it, and waiting does not make the matter better.

A diagnostic tool that makes no contact, or a fault entry that remains despite an attempt to clear it, also counts as a sign.

Which vehicles is the 89170-52E00 fitted in?

The 89170-52E00 is fitted in vehicles: Toyota Yaris XP90 (2005-2009) and XP90 Facelift (2009-2011). The assignment covers the vehicles that are known to us so far.

These are the models we have recorded so far:

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

Compare the part number on the removed unit with this page, and you will know that it is the right unit. This comparison does not reveal the condition of the control unit. Therefore, have the fault memory read out beforehand, because only then will it be clear whether the control unit is defective or 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 89170-52E00 work?

First have the fault memory read out and keep the log ready, then disconnect the battery and remove the control unit. Then create the repair order online and send the well-packed unit in. At Airbag24, testing, repairing and checking usually take 3–4 working days.

At Airbag24, the unit is first examined on the test bench. Defective components are then replaced, the crash data is erased and a function test is carried out. 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 89170-52E00 get to Airbag24?

Either you pack the unit yourself as a parcel, or you book a UPS collection for an extra charge. UPS handles the return after the repair.

The printed repair order goes into the parcel, and the control unit needs shockproof packaging.