Airbag control unit with part number 89170-48C80

What does the airbag control unit 89170-48C80 do?

The control unit 89170-48C80 forms the central hub of the restraint system (SRS) of Lexus. It reads the signals of the crash sensors and, in a crash, decides within milliseconds which airbags and seatbelt pretensioners are triggered. Faults in the system are reported via the airbag warning light.

Evaluation runs continuously as long as the vehicle is powered. The unit also monitors the connected sensors and firing circuits.

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

Why does the control unit 89170-48C80 fail?

The most common cause is crash data stored after an accident, even where no airbag has deployed; a standard diagnostic tool cannot erase it. Ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible.

Crash data remains in the memory even if no airbag has deployed in the accident. Airbag24 removes it during the repair.

Electronic components age over time. Solder joints can go cold, and moisture and corrosion impair the contact at the plugs.

Voltage spikes, for example from a weak battery or a jump start, further stress the electronics.

How can you tell that the 89170-48C80 is defective?

The airbag warning light in the instrument cluster lights up continuously or intermittently, an error message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, or the fault memory cannot be erased.

The light is the clearest sign of a defect. If it comes on, have the system checked promptly.

In an emergency, airbags and seatbelt pretensioners could fail to trigger. This risk remains as long as the fault is not rectified.

Which vehicles is the 89170-48C80 fitted in?

The control unit 89170-48C80 from Lexus is fitted in these vehicles: Lexus LX URJ200 (2008-2021).

Below you will find the vehicles recorded for this part number.

• Lexus LX URJ200 (2008-2021)

Compare the part number on the label of the removed unit with this page. That only ensures that you have the correct unit in front of you. Also have the fault memory read out before you remove the control unit. Only that result shows whether the control unit is defective or a plug or cable is the cause.

How does the repair of the 89170-48C80 work?

First have the fault memory read out and attach the log to the parcel. Then disconnect the battery and only then remove the control unit 89170-48C80. Next, create a repair order online and send the well-packed unit in. Processing at Airbag24 itself usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes back to you.

The period applies solely to checking, repairing and testing in our workshop.

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 89170-48C80 get to Airbag24?

You send the control unit 89170-48C80 as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.