Airbag control unit with part number 89170-42A10

What does the airbag control unit 89170-42A10 do?

The control unit 89170-42A10 is the airbag control unit of the restraint system (SRS) for Toyota. It polls the crash sensors, determines in a crash, within fractions of a second, the triggering of airbags and seatbelt pretensioners, and monitors the system.

The electronics report detected faults via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself.

Why does the control unit 89170-42A10 fail?

The most common cause with the 89170-42A10 is crash data from an accident, even without an airbag having deployed. Ordinary diagnostic tools cannot erase it; other possible causes include aged components, cold solder joints, moisture, corrosion and voltage spikes.

The crash data remains in memory, regardless of whether an airbag has deployed. A normal readout does not remove it.

Components age, and solder joints can go cold. Moisture and corrosion at plug connections disrupt the contact, and voltage spikes from a weak battery or a jump start put strain on the unit.

How can you tell that the 89170-42A10 is defective?

The airbag warning light in the instrument cluster indicates the defect in the 89170-42A10 when it lights up permanently or intermittently. Fault messages in the instrument cluster, a missing contact of the diagnostic tool, and a fault memory that cannot be cleared also belong to this.

In an emergency, the airbags and seatbelt pretensioners may then fail to deploy. That is why the warning light must be taken seriously.

Have the system checked promptly, and the cause will become apparent.

Which vehicles is the 89170-42A10 fitted in?

The control unit 89170-42A10 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The following list shows the vehicles recorded for this part number.

• 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. Have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or a plug or 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 89170-42A10 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit 89170-42A10. Afterwards create a repair order online and send in the unit well packed.

Airbag24 checks the unit, replaces defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days, measured solely by the checking, repairing and testing.

Afterwards, your own 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 89170-42A10 get to Airbag24?

You send the control unit 89170-42A10 as a parcel, or for an extra charge you book a UPS collection. Airbag24 returns it by UPS after the repair.

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