Airbag control unit with part number 89170-48F30

What does the airbag control unit 89170-48F30 do?

The unit 89170-48F30 controls the restraint system (SRS) in vehicles of the make Lexus. It reads the signals from the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners fire, and checks the entire system without interruption. Faults found appear on the airbag warning light.

In everyday use the unit works in the background and reports only when there is a fault. After an accident, it stores crash data and locks itself.

Why does the control unit 89170-48F30 fail?

Stored crash data is most often the cause, even if no airbag was triggered in the accident; a normal diagnostic tool cannot erase it. In addition come aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes, for example from a weak battery or a jump start.

The origin of the crash data lies in the accident itself, because the unit recorded the event. The data remains in the memory until Airbag24 erases it as part of the repair.

Ageing, moisture and voltage spikes can act together, and only the test shows which cause applies.

How can you tell that the 89170-48F30 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, through a fault message in the instrument cluster, through a missing contact to the diagnostic tool and through a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

These signs occur individually or together:

• Airbag warning light stays on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

The warning light makes the finding visible as soon as the system detects it, and taking this indication seriously is therefore important.

Which vehicles is the 89170-48F30 fitted in?

The 89170-48F30 is fitted in these vehicles: Lexus RX AL20 Facelift (2019-2022) and AL20 (2015-2019).

The following vehicle list belongs to this part number:

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

Comparing the part number on the label of the removed unit with this page only shows that it is the correct unit. Have the fault memory read out before removal: only this result shows whether the control unit is defective or whether a plug or cable is the cause.

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 89170-48F30 work?

At Airbag24, checking, repairing and testing usually take 3–4 working days. After that your own unit is returned to you.

Before you send the unit in, have the fault memory read out and enclose the log. Then disconnect the battery, remove the control unit and create the repair order online.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. 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 89170-48F30 get to Airbag24?

You send the unit as a package to Airbag24, or for an extra charge you book a UPS collection. After the repair, Airbag24 sends the unit back by UPS.

The printed repair order belongs in the package, and the unit must be packed shockproof.