Airbag control unit with part number 89170-52310

What does the airbag control unit 89170-52310 do?

The airbag control unit 89170-52310 coordinates the restraint system (SRS) for Toyota in the vehicle. In a collision it evaluates the signals from the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered. It also monitors the entire system without interruption.

If the control unit detects a fault, it reports it to the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-52310 fail?

Stored crash data is the most common cause of a failure, even if no airbag has deployed; a normal diagnostic tool cannot remove it. Further triggers are aged electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data therefore remain in the unit until it is repaired. The other triggers occur individually or together.

Voltage spikes arise, for example, with a weak battery or jump-starting, whereas corrosion affects the plug contacts.

How can you tell that the 89170-52310 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently. In addition a fault message appears, the diagnostic tool finds no connection, and the fault memory cannot be cleared.

Signs like these point to a fault that you cannot overlook. In an emergency, airbags and seatbelt pretensioners may then not trigger.

Which vehicles is the 89170-52310 fitted in?

The airbag control unit 89170-52310 is fitted in these vehicles: Toyota Echo XP10 (1999-2002) and XP10 Facelift (2002-2005). The assignment below shows which model belongs to your own car.

The assignment of the vehicles follows on the next line:

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

You can check the part number on the label against this page yourself before removal. Have the fault memory read out beforehand; the log shows whether the control unit is defective or a connector or a 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 89170-52310 work?

First have the fault memory read out and attach the log. Then disconnect the battery, and only after that remove the 89170-52310. Next create the repair order online and pack the unit well before it goes on its way.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and carries out a functional test. For this work at Airbag24, 3–4 working days are usually scheduled.

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 89170-52310 get to Airbag24?

You send the 89170-52310 control unit as a parcel, or have it collected by UPS for an extra charge. After the repair, Airbag24 returns it by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shock-proof.