Airbag control unit with part number 89170-48370

What does the airbag control unit 89170-48370 do?

The airbag control unit 89170-48370 forms the control centre of the restraint system (SRS) in Toyota. It processes the measured values from the crash sensors and decides in an impact within milliseconds on airbags and seatbelt pretensioners.

The unit also monitors the system during operation and reports faults via the airbag warning light. The message appears in the instrument cluster, so you can see a fault in everyday use.

After an accident, the control unit writes crash data to its memory. It then remains locked until it has been repaired.

Why does the control unit 89170-48370 fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed; a standard diagnostic tool cannot remove it. Further causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from weak batteries or jump-starting.

The crash data remains stored after the event, because the memory of the control unit holds it. The workshop therefore cannot simply reset the fault. Airbag24 removes the data in a targeted way during the repair.

Besides the accident, the electronics themselves and the environment play a role. Components age, solder joints can be cold, and plug connections corrode when moisture gets in. Voltage spikes from the vehicle electrical system can also be a trigger.

How can you tell that the 89170-48370 is defective?

Signs are an airbag warning light in the instrument cluster that lights up permanently or intermittently, a fault message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

In such a case, airbags and seatbelt pretensioners may not deploy in an emergency. That makes the warning serious, even if the car otherwise drives completely normally.

The warning light is meant to tell you the state of the system. Respond to it promptly.

Which vehicles is the 89170-48370 fitted in?

The control unit 89170-48370 is fitted in these vehicles: Toyota Highlander XU40 (2007-2013). You clarify the match with your car by comparing the label.

The vehicle list in detail:

• Toyota Highlander XU40 (2007-2013)

Compare the part number on the label of the removed unit with this page, and you know it is the correct unit. Also have the fault memory read out beforehand. Only this log shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-48090, 89170-48240.

How does the repair of the 89170-48370 work?

First read out the fault memory and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online before packing and sending it in.

The removal takes place only after the battery has been disconnected, and the dispatch preparation follows afterwards. Make sure the unit is not damaged while packing.

Airbag24 checks the unit on the test bench, repairs defective components, deletes the stored crash data and runs a function test. Checking, repairing and testing usually takes 3–4 working days. Airbag24 then sends your own unit 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 89170-48370 get to Airbag24?

You send the control unit 89170-48370 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, UPS returns your own unit to you.

Enclose the printed repair order in the parcel and pack the unit shock-proof so that it is not damaged on the way.