Airbag control unit with part number 89170-02B70

What does the airbag control unit 89170-02B70 do?

The airbag control unit 89170-02B70 is the control centre of the SRS restraint system in the Toyota. In an impact, it checks the crash sensors and decides which airbags and seatbelt pretensioners fire.

The system remains under constant monitoring during operation. If a fault is detected, the warning signal of the airbag warning light appears.

If it has registered an accident, it stores crash data and locks itself.

Why does the control unit 89170-02B70 fail?

Stored crash data is the most common cause in the control unit 89170-02B70, even if no airbag has deployed. Added to this are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be deleted with a standard diagnostic tool. Airbag24 handles the removal as part of the repair.

The other causes are linked to operation over many years. Components age, solder joints can go cold, and moisture or salt attack the plug contacts. Voltage spikes, for example from a weak battery, additionally stress the electronics.

How can you tell that the 89170-02B70 is defective?

The airbag warning light in the instrument cluster lights up on the 89170-02B70 permanently or from time to time. In addition, a fault message appears in the instrument cluster, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared.

Together, these signs show that the restraint system is reporting a fault.

In an emergency, airbags and seatbelt pretensioners may therefore fail to deploy. An inspection of the cause is then the right next step.

Which vehicles is the 89170-02B70 fitted in?

The 89170-02B70 is fitted in these vehicles: Toyota Corolla E140 (2006-2013).

The list of vehicles follows directly below.

• Toyota Corolla E140 (2006-2013)

First: compare the part number on the label of the removed unit with this page, to make sure that it is the correct unit. Second: have the fault memory read out beforehand. Only this log shows whether the control unit is defective or whether a plug or cable is the cause.

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

How does the repair of the 89170-02B70 work?

First, have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit 89170-02B70. Afterwards, create the repair order online.

Then send the well-packed unit in. At Airbag24 it is checked on the test bench, defective components are replaced, the crash data is deleted and a function test is carried out.

Processing at Airbag24 usually takes 3–4 working days. Afterwards you receive your own, repaired unit back.

The order protects you during removal. 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 89170-02B70 get to Airbag24?

You send the control unit 89170-02B70 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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