Airbag control unit with part number 89170-02K70

What does the airbag control unit 89170-02K70 do?

The airbag control unit 89170-02K70 controls the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, decides within milliseconds in a crash which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After a crash, it stores crash data and locks itself.

Continuously means that the unit checks its sensors, wiring and output stages even during normal driving. Every deviation is registered.

The control unit shows faults via the airbag warning light in the instrument cluster. This is where you will first notice a defect.

Why does the control unit 89170-02K70 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot erase it, but Airbag24 deletes it during the repair. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains in the memory after an accident, even if no airbag has been deployed. This is exactly the most common reason for a failure that may not be recognisable from outside.

The other causes relate to the electronics and their surroundings. Components age, solder joints can become cold, and moisture or corrosion affects plug connections. Voltage spikes, for example from a weak battery or a jump start, can also do damage.

How can you tell that the 89170-02K70 is defective?

A defect shows up at the airbag warning light in the instrument cluster, which stays on permanently or intermittently. In addition there is a fault message in the instrument cluster and a diagnostic tool that cannot establish a connection. Airbags and seatbelt pretensioners may then not trigger in an emergency.

These signs can occur together:

• the airbag warning light, which stays on permanently or intermittently,
• a fault message in the instrument cluster,
• a diagnostic tool that cannot find the control unit,
• a fault memory that cannot be cleared.

If you notice any of these, you should take the vehicle for an examination promptly.

Which vehicles is the 89170-02K70 fitted in?

Check the model list to see whether your vehicle is included. The 89170-02K70 is fitted for Toyota in these vehicles: Toyota Corolla E170 (2013-2018).

The list contains the vehicles for which this control unit has been recorded:

• Toyota Corolla E170 (2013-2018)

Compare the part number on the label of the removed unit with this page, and you will know that it is the correct unit. Whether it is defective is not shown by this comparison. Therefore have the fault memory read out beforehand, because only this result shows whether the control unit or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-02C60, 89170-02C70, 89170-02C80, 89170-02C90, 89170-12280, 89170-12340.

How does the repair of the 89170-02K70 work?

First have the fault memory read out and the log attached, then disconnect the battery and remove the control unit. Next create a repair order online and send the well-packed unit in. Processing at Airbag24 normally takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, erases the stored crash data and carries out a function test. These 3–4 working days cover only the checking, repairing and testing at Airbag24.

Afterwards your own unit comes 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 89170-02K70 get to Airbag24?

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

Enclose the printed repair order in the parcel, and pack the unit shock-proof.