Airbag control unit with part number 89170-52150

What does the airbag control unit 89170-52150 do?

The 89170-52150 is the central control unit of the restraint system (SRS) of Toyota. It processes the reports from the crash sensors and triggers the intended airbags and seatbelt pretensioners in an accident.

While driving, it monitors the components and the wiring of the system. Faults found are reported via the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-52150 fail?

The most common cause is crash data stored after an accident, even if no airbag has fired. In addition, aged electronic components, cold solder joints, moisture and voltage spikes come into consideration.

Crash data remains stored in the control unit, and a normal diagnostic tool cannot erase it. That is exactly why a simple reset is not enough.

The other causes mainly concern the electronics themselves and their connections. Moisture and corrosion on plug connections can disturb contacts, while cold solder joints lead to intermittent faults. Voltage spikes arise, for example, from a weak battery or when starting with an external power source.

How can you tell that the 89170-52150 is defective?

The airbag warning light in the instrument cluster stays on constantly or only intermittently, and an error message appears alongside it. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

The airbag warning light is the sign you will notice first on the dashboard. A defect in the 89170-52150 thus does not show itself in just one place.

As long as the fault exists, airbags and seatbelt pretensioners may fail to deploy in an emergency. A prompt check therefore provides clarity.

Which vehicles is the 89170-52150 fitted in?

The information applies to this part number. The control unit 89170-52150 is fitted in these vehicles: Toyota Echo XP10 (1999-2002) and XP10 Facelift (2002-2005).

The following models belong to this part number:

• Toyota Echo XP10 (1999-2002)
• Toyota Echo XP10 Facelift (2002-2005)

Comparing the part number on the label of the removed unit with this page confirms only that it is the right unit. In addition, have the fault memory read out beforehand, because only the log 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 89170-52050, 89170-52310-93C56.

How does the repair of the 89170-52150 work?

At Airbag24, checking, repairing and function testing of the 89170-52150 usually takes 3–4 working days. Defective components are replaced and stored crash data is deleted.

First you read out the fault memory and enclose the log. Then you disconnect the battery and remove the control unit. Afterwards, you create the repair order online.

Pack the unit well and send it in. Airbag24 checks it on the test bench and carries out a function test; afterwards your own unit goes 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 89170-52150 get to Airbag24?

Either you send the 89170-52150 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair, your own unit comes back to you by UPS.

The printed repair order goes in the parcel. Pack the unit shockproof.