Airbag control unit with part number 89170-42D41

What does the airbag control unit 89170-42D41 do?

The airbag control unit 89170-42D41 acts as the central unit of the restraint system (SRS) in Toyota. It evaluates the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The control unit indicates faults via the airbag warning light. To do so, it checks sensors, wiring and plug connections during operation.

After an accident it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-42D41 fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed. Aged electronics, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from the battery or jump-starting are also possible causes.

Crash data remains in the unit after an accident. A normal diagnostic tool cannot erase it, which is exactly why Airbag24 removes it during the repair.

Electronic components age, and solder joints on the circuit board can become cold over time. Moisture and corrosion at plug connections disrupt signal transmission.

Voltage spikes stress the electronics, for example with a weak battery or when jump-starting.

How can you tell that the 89170-42D41 is defective?

The airbag warning light in the instrument cluster is on constantly or intermittently, an error message appears in the instrument cluster, the diagnostic tool cannot find the control unit, or the fault memory cannot be cleared. In such a case, airbags and seatbelt pretensioners may not be able to deploy in an emergency.

The airbag warning light is the most important signal of the system. It indicates a fault before the fault becomes noticeable in everyday use.

A diagnostic tool that cannot establish a connection, and a fault memory that cannot be cleared, are clear indications that the control unit needs checking.

Which vehicles is the 89170-42D41 fitted in?

The 89170-42D41 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The list shows the vehicles to which this part number is assigned.

• Toyota RAV4 XA50 (from 2018)

Compare the part number on the label of the removed unit with this page, which only confirms that you have the correct unit. Have the fault memory read out, because this result alone shows whether the control unit is defective or whether 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 89170-42D41 work?

First have the fault memory read out, then disconnect the battery and remove the unit. Send in the device with a repair order. Airbag24 usually needs 3–4 working days for processing.

You disconnect the battery before removal, and you enclose the log with the unit.

Airbag24 tests the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Only then is your own unit returned 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 89170-42D41 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 returns the repaired unit to you by UPS.

The printed repair order goes into the parcel. Pack the unit so that it is protected against shocks.