Airbag control unit with part number 89170-42D10

What does the airbag control unit 89170-42D10 do?

The airbag control unit 89170-42D10 belongs to the restraint system (SRS) in the Toyota. It receives the measurements from the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and checks continuously whether the system is ready for operation. It reports faults via the airbag warning light.

The monitoring covers all connected components, so that faults are detected. The unit works in the background without any action on your part.

After an accident the unit stores crash data and locks itself.

Why does the control unit 89170-42D10 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered. A standard diagnostic tool cannot remove them. In addition there are aged components, cold solder joints, moisture and corrosion, and voltage spikes.

At Airbag24 the crash data are erased as part of the repair. Typical further causes are:

• aging of the electronic components
• cold solder joints on the circuit board
• moisture and corrosion on plug connections
• voltage spikes from a weak battery or a jump start

How can you tell that the 89170-42D10 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently and thereby indicates a fault. A fault message in the instrument cluster may accompany it.

• airbag warning light that stays on permanently or lights up intermittently
• fault message in the instrument cluster
• diagnostic tool that cannot establish a connection to the control unit
• fault memory that cannot be cleared

While such a fault exists, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency. The fault is therefore displayed, and a check follows.

Which vehicles is the 89170-42D10 fitted in?

The airbag control unit 89170-42D10 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The vehicles recorded for this part number are listed below.

• Toyota RAV4 XA50 (from 2018)

On the one hand, compare the part number on the label of the removed unit with this page; this only confirms that you have the right unit. On the other hand, have the fault memory read out beforehand, because only this result 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 89170-42D10 work?

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

Airbag24 checks the unit on the test bench and replaces defective components. In addition, Airbag24 erases the stored crash data and carries out a function test. Processing usually takes 3–4 working days before your own unit goes back.

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 89170-42D10 get to Airbag24?

You decide whether to send the unit yourself as a parcel or to book a UPS collection for an additional charge. The return after the repair is also made via UPS.

The printed repair order must go into the parcel. Pack the unit shock-proof.