Airbag control unit with part number 89170-42880

What does the airbag control unit 89170-42880 do?

The airbag control unit 89170-42880 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds about triggering airbags and seatbelt pretensioners, and monitors the system continuously.

It shows faults via the airbag warning light. Anyone who knows this indicator recognises early when something is wrong with the restraint system.

After an accident the unit stores crash data and locks itself. The sensor evaluation runs in the background; you do not need to adjust anything.

Why does the control unit 89170-42880 fail?

Stored crash data is the most common cause, and this applies even when no airbag was triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are further possible causes.

Crash data cannot be removed with a normal diagnostic tool. It remains in the control unit and is visible during the read-out.

Which of the further causes is present is shown by the examination. The components and connections are checked in the process.

How can you tell that the 89170-42880 is defective?

Indications are:

• the airbag warning light lights up permanently or intermittently
• an error message appears in the instrument cluster
• the diagnostic tool gets no connection to the control unit
• the fault memory cannot be cleared

With these indications, airbags and seatbelt pretensioners may not trigger in an emergency.

The warning light reports a detected fault, even when it lights up only intermittently.

A missing connection to the diagnostic tool may come from the control unit, but it does not have to. The fault memory provides information on this.

Which vehicles is the 89170-42880 fitted in?

The control unit 89170-42880 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

Our data records the following models for this control unit:

• Toyota RAV4 XA50 (from 2018)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Also have the fault memory read out before removal. Only this result shows whether the control unit is defective or a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 150800-4431, 152100-0262, 152100-4560, 89170-42400, 89170-42870, 89170-42A60.

How does the repair of the 89170-42880 work?

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

The sequence is mandatory for safety reasons. Only after the battery has been disconnected is the control unit removed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. For these tasks at Airbag24, 3–4 working days are generally planned.

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 89170-42880 get to Airbag24?

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

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