Airbag control unit with part number 89170-24430

What does the airbag control unit 89170-24430 do?

The airbag control unit 89170-24430 controls the restraint system (SRS) for Lexus. It reads the crash sensors, selects the airbags and seatbelt pretensioners to be triggered within milliseconds in an accident, and monitors the entire system. It reports irregularities via the airbag warning light.

The control unit works in the background all the time as long as the vehicle is powered. After an accident, crash data is stored and the unit locks itself.

It is connected to the sensors in the vehicle and to the seatbelt pretensioners, whose status it queries continuously.

Why does the control unit 89170-24430 fail?

The most common cause for the 89170-24430 is considered to be crash data from an accident, which remains stored even if no airbag was triggered; a normal diagnostic tool does not erase it. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The stored crash data remains in the memory even when the vehicle looks undamaged after the accident. The other causes concern the electronics themselves or their connections.

How can you tell that the 89170-24430 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool finds no connection to the control unit 89170-24430, and the fault memory cannot be cleared. In this case airbags and seatbelt pretensioners may not trigger in an emergency.

The airbag warning light is the most visible sign that the system has detected a fault. A fault memory that cannot be cleared confirms this finding in addition.

Which vehicles is the 89170-24430 fitted in?

The airbag control unit 89170-24430 is fitted in these vehicles: Lexus RC ASC10 (2015-2018) and ASC10 Facelift (from 2018).

The following list shows the vehicles in which the unit is installed.

• Lexus RC ASC10 (2015-2018)
• Lexus RC ASC10 Facelift (from 2018)

Two things help before removal. The part number on the label can be compared with this page, which only confirms that it is the correct unit. Whether the control unit itself is defective or a plug or cable is the cause only becomes clear from a read-out fault memory.

For the same vehicles, we also repair control units with the part numbers 89170-24170, 89170-24300, 89170-24320, 89170-24340, 89170-78010.

How does the repair of the 89170-24430 work?

First read out the fault memory and enclose the log. Then disconnect the battery and only afterwards remove the control unit 89170-24430. Then create a repair order online and send the unit in.

Airbag24 tests the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Processing usually takes 3–4 working days. The unit then goes 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 89170-24430 get to Airbag24?

A UPS collection for an extra charge is possible, as is sending the parcel yourself. The control unit 89170-24430 comes back to you by UPS after the repair.

The printed repair order belongs in the parcel, and the unit must be packed shock-proof.