Airbag control unit with part number 89170-42C80

What does the airbag control unit 89170-42C80 do?

As the airbag control unit 89170-42C80, it forms the central control of the SRS restraint system from Toyota. It processes the readings from the crash sensors, decides in an accident within milliseconds on activating the airbags and seatbelt pretensioners, and displays faults via the airbag warning light.

The unit checks the system continuously for irregularities. If one is present, it is stored. After an accident, the control unit creates crash data and locks itself.

The evaluation runs in the background without any action by the driver.

Why does the control unit 89170-42C80 fail?

Stored crash data from an accident is the most common cause, even if no airbag has deployed, and a normal diagnostic tool cannot remove it. Aged electronics, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes also play a part.

That the data is held in memory does not necessarily mean the unit is damaged. Airbag24 clears it as part of the repair.

The other causes arise over time. Electronic components weaken, solder joints can be cold, and moisture attacks plug connectors. Voltage spikes occur, for example, with a weak battery or a jump start.

How can you tell that the 89170-42C80 is defective?

A defect shows up as an airbag warning light in the instrument cluster that burns permanently or intermittently. Error messages in the instrument cluster, a diagnostic tool without connection to the control unit, and a fault memory that cannot be cleared are added to this.

The system may then be unable to trigger airbags and seatbelt pretensioners as intended in an emergency.

A warning light is a clear message from the vehicle. Therefore have it checked promptly rather than waiting.

Which vehicles is the 89170-42C80 fitted in?

The control unit 89170-42C80 is fitted in these vehicles: Toyota RAV4 XA50 (from 2018).

The models for which this part number is listed are shown here:

• Toyota RAV4 XA50 (from 2018)

Comparing the part number on the label of the removed unit with this page merely shows that the matching unit is present. Whether the unit is faulty or whether a plug or cable is causing the fault is clarified only by a fault memory read out in advance.

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 89170-42C80 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create the repair order online and pack the unit carefully before sending it in.

At Airbag24, the unit is checked, defective components are repaired, the crash data is erased and a function test is carried out. Afterwards your own, repaired unit comes back to you.

Processing usually takes 3–4 working days. 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 89170-42C80 get to Airbag24?

The unit reaches Airbag24 as a parcel, or you book UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Enclose the printed repair order and pack the unit shockproof.