Airbag control unit with part number 89170-12L80

What does the airbag control unit 89170-12L80 do?

The airbag control unit 89170-12L80 is the central control unit of the restraint system for Toyota. It evaluates the crash sensors, decides in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

The evaluation runs in the background while the sensor measured values arrive continuously. From this the decision follows as to which restraint devices react in an emergency.

After an accident, the unit stores crash data and locks itself. A reported fault therefore calls for a prompt check.

Why does the control unit 89170-12L80 fail?

On the 89170-12L80, the most common cause is stored crash data after an accident, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Other causes are also possible: ageing components, solder joints, moisture and corrosion at plug connections, and voltage spikes.

Other causes may also come into question:

• ageing of electronic components
• poorly soldered points on the circuit board
• moisture and rust at plug connections
• voltage spikes from the vehicle electrical system, for example with a weakened battery

The crash data remains in the unit after an accident, even if airbags and seatbelt pretensioners did not trigger. A standard diagnostic tool cannot be made to remove it.

How can you tell that the 89170-12L80 is defective?

On the 89170-12L80, a defect shows up through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message in the instrument cluster, through no connection to the diagnostic tool, and through a fault memory that cannot be cleared.

Typical signs are:

• airbag warning light permanently or intermittently on
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory cannot be cleared

With these signs, airbags and seatbelt pretensioners may not trigger in an emergency, even if the vehicle drives inconspicuously in everyday use.

Which vehicles is the 89170-12L80 fitted in?

The control unit 89170-12L80 is fitted in these vehicles: Toyota Corolla E170 (2013-2018).

The fitment covers the following models:

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page, as this only confirms that you have the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit itself is defective or whether a plug or a 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 89170-12L80 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Airbag24 usually needs 3–4 working days for this.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. Afterwards your own unit is returned.

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 89170-12L80 get to Airbag24?

You send the control unit 89170-12L80 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant.