Airbag control unit with part number 89170-42F31

What does the airbag control unit 89170-42F31 do?

The airbag control unit 89170-42F31 controls the SRS for Toyota. It evaluates crash sensors, decides in an accident on airbags and seatbelt pretensioners, and monitors the system continuously. After an accident, it stores crash data and locks itself.

The unit is the switching point of the system: from there the trigger signals go to the airbag modules and the seatbelt pretensioners, and from there feedback about the state of the system comes back. If it detects a fault, it reports it via the airbag warning light.

The lock after an accident ends only with the repair at Airbag24.

Why does the control unit 89170-42F31 fail?

Most often it is caused by crash data from an earlier accident, even if no airbag was triggered; diagnostic tools cannot remove this data. Aged electronics, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes, are also among the causes.

Airbag24 removes crash data during the repair. The other causes concern the electronics themselves or their contacts.

A weak battery, jump-starting or voltage spikes in the vehicle's electrical system can additionally load the unit, even when there was no accident.

How can you tell that the 89170-42F31 is defective?

The airbag warning light in the instrument cluster lights up continuously or only intermittently. In addition, there is an error message in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared. Then airbags and seatbelt pretensioners may not trigger in an emergency.

The light is the first sign you notice, and it indicates the fault as soon as the system detects it. If the warning light comes on, do not wait; have the fault memory read out.

Which vehicles is the 89170-42F31 fitted in?

The 89170-42F31 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The vehicles on record for this part number are listed here:

• Toyota RAV4 XA50 (from 2018)

A comparison of the label on the removed unit with this page only confirms that it is the right unit. Whether the control unit itself is defective or a plug or cable is behind the fault, only the fault memory read out beforehand will show.

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 89170-42F31 work?

Have the fault memory read out first and attach the log, then disconnect the battery and remove the unit. Afterwards create a repair order online and send the unit in well packed. Airbag24 needs 3–4 working days for checking, repairing and testing.

The unit is checked in-house, defective components are renewed, the crash data are erased and a function test is carried out. Then your own unit goes back to you.

The sequence when removing the unit serves safety.

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 89170-42F31 get to Airbag24?

You send the control unit as a parcel or book UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order goes into the parcel, and the unit is packed shockproof.