Airbag control unit with part number 89170-42A50

What does the airbag control unit 89170-42A50 do?

The airbag control unit 89170-42A50 manages the restraint system (SRS) in the Toyota. From the signals of the crash sensors it calculates which airbags and seatbelt pretensioners trigger in an accident.

It checks the system continuously and displays faults via the airbag warning light in the instrument cluster.

If an accident has occurred, the control unit stores crash data. It then remains locked, and only the repair lifts this lock.

Why does the control unit 89170-42A50 fail?

The most common cause for the 89170-42A50 is stored crash data, even if no airbag has deployed. Aged components, cold solder joints, moisture and voltage spikes come on top of this.

Crash data cannot be erased with an ordinary diagnostic tool. During the repair, Airbag24 removes it.

The other causes concern electronics and connections. Components age, solder joints can be cold, and plug connections corrode when moisture gets in. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the unit.

How can you tell that the 89170-42A50 is defective?

On the 89170-42A50, a defect shows itself mainly through the airbag warning light, which lights up permanently or intermittently. An error message, a missing connection to the diagnostic tool or a fault memory that cannot be cleared also point to it.

The symptoms include:

• airbag warning light, permanently or intermittently
• error message in the instrument cluster
• diagnostic tool does not reach the control unit
• fault memory remains

In that case, airbags and seatbelt pretensioners may fail to deploy in an emergency. A prompt check is therefore advisable.

Which vehicles is the 89170-42A50 fitted in?

The 89170-42A50 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018). The information applies to this part number only.

These vehicles are recorded for this part number:

• Toyota RAV4 XA50 (from 2018)

Matching the part number with this page ensures that the unit fits; it does nothing more. Only reading out the fault memory shows whether the control unit itself or a plug or cable is the cause. Therefore have the fault memory read out before anything else.

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 89170-42A50 work?

At Airbag24, processing of the 89170-42A50 usually takes 3–4 working days, counted for testing, repairing and checking only. The steps before that are reading out, removal and sending.

First have the fault memory read out and enclose the log with the unit. Then disconnect the battery and remove the control unit. Afterwards create the repair order online and pack the unit well.

Airbag24 checks the unit, replaces defective components, erases the crash data and carries out a function test. Afterwards the unit returns 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 89170-42A50 get to Airbag24?

You can send the 89170-42A50 in as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

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