Airbag control unit with part number 89170-0F031

What does the airbag control unit 89170-0F031 do?

The central control unit of the restraint system (SRS) in Toyota is the airbag control unit 89170-0F031. It processes the signals from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners in an accident.

The unit monitors the system continuously. If it notices a fault, it creates an entry in the fault memory and shows it via the airbag warning light.

After an accident, crash data remains in the unit and the control unit locks itself. Only the repair lifts the lock.

Why does the control unit 89170-0F031 fail?

The most common cause is crash data that stays stored after an accident, even if no airbag was triggered. Added to this are ageing electronic components, cold solder joints, moisture and corrosion on plugs, and voltage spikes from a weak battery or a jump start.

Such data cannot be removed with normal diagnostics. Airbag24 takes over the erasure during the repair.

Aged components lose reliability over time, and cold solder joints lead to contacts that do not remain continuously connected.

Moisture or corrosion on the plugs disrupt transmission. Voltage spikes from a weak battery or a jump-start procedure additionally load the unit.

How can you tell that the 89170-0F031 is defective?

A defect manifests itself through the airbag warning light, which lights up permanently or intermittently, or through an error message in the instrument cluster. A missing contact from the diagnostic tool or a fault memory that cannot be cleared are also indications.

• The airbag warning light in the instrument cluster stays on permanently.
• The airbag warning light comes on only intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool does not establish a connection to the control unit.
• The fault memory cannot be cleared.

With such signs, airbags and seatbelt pretensioners may not deploy in an emergency. A prompt check is therefore appropriate.

Which vehicles is the 89170-0F031 fitted in?

These vehicles carry the 89170-0F031 on board: Toyota Corolla E140 (2006-2013).

The assignment to this part number is as follows:

• Toyota Corolla E140 (2006-2013)

That the part number on the label matches this page only confirms that it is the matching unit.

Before removal, have the fault memory read out. Only the result shows whether the control unit is defective or whether a plug or a cable is involved.

For the same vehicles, we also repair control units with the part numbers 89170-0F032, 89170-12160.

How does the repair of the 89170-0F031 work?

Checking, repairing and testing at Airbag24 usually take 3–4 working days. Beforehand you have the fault memory read out, attach the log and disconnect the battery; only then do you remove the control unit.

Afterwards you create the repair order online and pack the unit well before sending it in.

Airbag24 examines the unit on the test bench, replaces defective components, erases the crash data and carries out a functional test. 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 89170-0F031 get to Airbag24?

You can send the unit as a parcel or book a UPS collection for an extra charge. It also comes back to you by UPS.

The printed repair order goes into the parcel, alongside shock-proof protective packaging.