Airbag control unit with part number 89170-42790

What does the airbag control unit 89170-42790 do?

The airbag control unit 89170-42790 brings together all triggering decisions in the restraint system (SRS) of Toyota. The signals from the crash sensors arrive there; from them, within milliseconds, it is determined which airbags and seatbelt pretensioners are activated.

At the same time, the unit checks the system continuously and displays faults via the airbag warning light.

If an accident occurs, the unit writes crash data permanently; after that it is locked.

Why does the control unit 89170-42790 fail?

Stored crash data from an accident is most often the cause, even if no airbag was triggered. Aged electronics, cold solder joints, moisture and corrosion at connectors, and voltage spikes, for example from a weak battery or jump-starting, are also possible.

A standard diagnostic tool cannot erase this data, so it remains in the memory until the repair.

Which of the other causes applies in the individual case must be determined by the examination.

How can you tell that the 89170-42790 is defective?

An airbag warning light that stays on permanently or intermittently is the clearest sign. An error message in the instrument cluster may appear alongside it, the diagnostic tool may not connect to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not deploy.

The light is one of the clearest signals the car gives.

Even a brief illumination is enough to have the fault memory read out.

Which vehicles is the 89170-42790 fitted in?

You clarify whether your vehicle fits using the label on the unit. The control unit 89170-42790 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The vehicles in which this control unit was fitted:

• Toyota RAV4 XA50 (from 2018)

If the part number on the removed unit matches this page, you have the right unit. Only the fault memory read out beforehand shows whether the control unit is defective or a connector or cable is behind it.

For the same vehicles, we also repair control units with the part numbers 150800-4431, 152100-0262, 152100-4560, 89170-0R070, 89170-0R090, 89170-0R091.

How does the repair of the 89170-42790 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send the unit in well packed.

Then the work at Airbag24 begins: the unit is checked on the test bench, defective components are replaced and stored crash data is deleted. A function test completes the repair.

Processing takes 3–4 working days as a rule.

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 89170-42790 get to Airbag24?

Either you send the unit in as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Pack it shock-proof and put the printed repair order into the parcel.