Airbag control unit with part number 89170-02C80

What does the airbag control unit 89170-02C80 do?

The airbag control unit 89170-02C80 is the central control unit of the restraint system (SRS) in Toyota. It processes the signals from the crash sensors, decides in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After a crash it locks itself; only the repair lifts the lock.

The unit reports faults via the airbag warning light in the instrument cluster. The fault data is stored in the fault memory.

Seatbelt pretensioners are controlled by the same control unit, which is why their condition matters for the entire restraint system.

Why does the control unit 89170-02C80 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. The other causes are ageing electronic components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data remains stored in the unit after an accident. Only the repair removes it. An airbag does not have to have deployed for this.

Other causes at a glance:

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

How can you tell that the 89170-02C80 is defective?

The airbag warning light in the instrument cluster stays on permanently or comes on intermittently, an error message appears in the instrument cluster, the diagnostic tool receives no connection to the control unit, and the fault memory cannot be cleared.

The airbag warning light makes the defect visible. It may stay lit permanently or only come on intermittently; both are findings.

An error message in the instrument cluster is also displayed. If the diagnostic tool fails to connect, or the fault memory remains full despite an attempt to clear it, the control unit or its connection is affected. Airbags and seatbelt pretensioners may then fail to deploy in an emergency. Prompt checking is therefore advisable.

Which vehicles is the 89170-02C80 fitted in?

The control unit 89170-02C80 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

This list shows the assignment to the models:

• Toyota Corolla E170 (2013-2018)

Comparing the part number on the label of the removed unit with this page only confirms the identity of the unit. Having the fault memory read out beforehand, by contrast, shows whether the control unit itself is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-02C70, 89170-12180, 89170-12G10, 89170-12N50.

How does the repair of the 89170-02C80 work?

First you read out the fault memory and attach the log. Then you disconnect the battery and only then remove the control unit 89170-02C80. Next, you create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

At Airbag24 the unit is checked on the test bench, defective components are replaced, 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 89170-02C80 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

Enclose the printed repair order and pack the control unit shockproof.