Airbag control unit with part number 89170-48F20

What does the airbag control unit 89170-48F20 do?

The airbag control unit 89170-48F20 manages the restraint system (SRS) of Lexus. It reads out the crash sensors and, in an accident, decides within a fraction of a second which airbags and seatbelt pretensioners are triggered.

It checks the entire system continuously. If it detects a fault, the airbag warning light in the instrument cluster lights up.

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

Why does the control unit 89170-48F20 fail?

Stored crash data from an accident is the most common cause, even if no airbag has deployed. Aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes are also possible causes.

Crash data cannot be erased with a normal diagnostic tool. The entry therefore stays in the control unit until Airbag24 erases the crash data during the repair.

Voltage spikes occur, for example, with a weak battery or during a jump start.

How can you tell that the 89170-48F20 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently and is the clearest sign. In addition there are error messages in the instrument cluster, no contact to the diagnostic tool and a fault memory that cannot be cleared.

Airbags and seatbelt pretensioners may then not trigger in an emergency.

Therefore have the system checked promptly.

Which vehicles is the 89170-48F20 fitted in?

This control unit 89170-48F20 is fitted in these vehicles: Lexus RX AL20 Facelift (2019-2022) and AL20 (2015-2019).

The list shows the vehicles that have this unit.

• Lexus RX AL20 Facelift (2019-2022)
• Lexus RX AL20 (2015-2019)

Matching the part number on the label with this page only ensures that it is the right unit. Whether the control unit itself is defective, or whether a plug or cable is the cause, is shown only by the fault memory once it has been read out. Therefore have it read out before removal.

For the same vehicles, we also repair control units with the part numbers 89170-0E021, 89170-0E260, 89170-48490, 89170-48890, 89170-48A00, 89170-48A10.

How does the repair of the 89170-48F20 work?

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

At Airbag24 the unit is checked on the test bench, defective components are repaired and the stored crash data is erased. At the end comes a functional test before your own unit makes its way back 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 89170-48F20 get to Airbag24?

You can send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back via UPS.

Pack the printed repair order in with the parcel and pack the unit shock-resistant.