Airbag control unit with part number 89170-42680

What does the airbag control unit 89170-42680 do?

The airbag control unit 89170-42680 is the central control unit of the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors and decides in an accident which airbags and seatbelt pretensioners trigger.

During operation, it monitors the entire system and shows faults via the airbag warning light. After an accident, the unit stores crash data and locks itself.

Seatbelt pretensioners and airbags depend on one single control unit, so a defect there affects the entire restraint system.

Why does the control unit 89170-42680 fail?

The most common cause is crash data stored after an accident, even if no airbag fired; a normal diagnostic tool cannot erase it. In addition there are aged electronics, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data stays in memory even if nothing was triggered on the airbags. An ordinary diagnostic tool cannot reset it.

The other causes are technical in nature: electronic components age, solder joints can be cold, and moisture or corrosion attack plug connections. Voltage spikes arise, for example, with a weak battery or when starting with jump leads.

How can you tell that the 89170-42680 is defective?

A defect shows through the airbag warning light, which lights up permanently or at times, through an error message in the instrument cluster, and through a missing connection to the diagnostic tool. In a real emergency, airbags and seatbelt pretensioners may then fail to deploy.

A fault memory that cannot be erased also counts among the signs. The control unit itself reports as soon as it detects a fault in the restraint system.

Have the vehicle checked promptly in this case.

Which vehicles is the 89170-42680 fitted in?

The 89170-42680 is installed in these vehicles: Toyota RAV4 XA50 (from 2018).

The list of associated vehicles follows here:

• Toyota RAV4 XA50 (from 2018)

Before removal, the label is worth a look: if the part number matches this page, you have found the right unit. Whether the unit itself is defective, however, only the fault memory read out beforehand will show. A plug or a cable can also be 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 89170-42680 work?

You have the fault memory read out and enclose the log before you disconnect the battery and remove the control unit 89170-42680. Then you create the repair order online and send the well-packed unit.

Airbag24 checks the unit on the test bench, finds and repairs defective components, deletes the crash data and carries out a functional test. Processing at Airbag24 usually takes 3–4 working days. Afterwards, the unit goes 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 89170-42680 get to Airbag24?

A parcel is enough to bring the control unit 89170-42680 to Airbag24; alternatively, you book a UPS collection for an additional charge. After the repair, Airbag24 sends the unit back to you via UPS.

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