Airbag control unit with part number 89170-02750

What does the airbag control unit 89170-02750 do?

The airbag control unit 89170-02750 belongs to the restraint system (SRS) of Toyota and controls its triggering. It reads out the crash sensors, selects the appropriate airbags and seatbelt pretensioners within milliseconds in the event of an accident, and monitors the system continuously. After an accident, it stores crash data and locks itself.

Monitoring runs throughout every journey. A detected fault appears via the airbag warning light in the instrument cluster.

Why does the control unit 89170-02750 fail?

Most often the cause lies in stored crash data that has entered the unit after an accident, even if no airbag has deployed; a normal diagnostic tool does not erase it. Other causes include ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start.

That crash data cannot be removed with ordinary tools makes it a stubborn finding.

The other causes concern the electronics themselves. Ageing components, cold solder joints and moisture at the contacts can cause disruption, just as voltage spikes can.

How can you tell that the 89170-02750 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light is among the signs you notice first. Whether it stays on continuously or only intermittently makes little difference to the warning.

If the diagnostic tool also has no connection, a check of the system is the next sensible step.

Which vehicles is the 89170-02750 fitted in?

The airbag control unit 89170-02750 is fitted in these vehicles: Toyota Corolla E140 (2006-2013). Whether your car is among them can only be roughly gathered from the list.

The known vehicles for this part number can be found here:

• Toyota Corolla E140 (2006-2013)

Comparing the part number on the label of the removed unit with this page only confirms that it is the matching unit. The cause is established by the fault memory: have it read out before you remove the unit.

For the same vehicles, we also repair control units with the part numbers 89170-02810, 89170-02830, 89170-02840, 89170-02860, 89170-02870, 89170-02B10.

How does the repair of the 89170-02750 work?

First have the fault memory read out and enclose the log; then disconnect the battery. Afterwards create a repair order online and pack the unit carefully before you send it in. Airbag24 checks it on the test bench, replaces defective components, deletes stored crash data and carries out a functional test; processing usually takes 3–4 working days.

This order is fixed for safety reasons, because the battery is only disconnected after the read-out.

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 89170-02750 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS. You print the repair order and put it in the parcel.

Pack the control unit shockproof so that it survives transport undamaged.