Airbag control unit with part number 89170-24360

What does the airbag control unit 89170-24360 do?

The airbag control unit 89170-24360 is the central control unit of the restraint system (SRS) of Lexus. It processes the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It shows faults via the airbag warning light.

If an accident happens, the unit records crash data and locks itself.

While driving, you do not consciously notice the control unit. It works out of sight in the system and only reports itself when a fault occurs.

Why does the control unit 89170-24360 fail?

Stored crash data is the most common cause, even if no airbag has deployed. A normal diagnostic tool cannot erase it, but Airbag24 removes it during the repair. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes can also be causes.

Crash data is created not only when an airbag has deployed, but as soon as an event is registered. It stays in the unit until it is erased.

The other causes are based on ageing and moisture, as well as voltage fluctuations, for example from a weak battery or a jump-start.

How can you tell that the 89170-24360 is defective?

The airbag warning light lights up constantly or intermittently, a fault message appears in the instrument cluster, the diagnostic tool cannot find the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners could then fail to deploy.

The overview of the signs:

• Airbag warning light, on constantly or intermittently
• Fault message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory that cannot be cleared

A single one of these signs justifies a check. The warning light is the clearest indication the vehicle gives.

Which vehicles is the 89170-24360 fitted in?

The control unit 89170-24360 is fitted in these vehicles: Lexus RC ASC10 (2015-2018) and ASC10 Facelift (from 2018).

These vehicles are known:

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

Compare the part number on the label of the removed unit with this page. That only clarifies whether it is the right unit. Whether it is defective is shown only by reading out the fault memory, because that also reveals whether a plug or a cable is the cause.

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 89170-24360 work?

You have the fault memory read out, attach the log, disconnect the battery and only then remove the control unit. Then you create a repair order online and send the unit in, packed well. Airbag24 checks, repairs and tests it, erases the crash data and returns your own unit.

The steps on the vehicle are your responsibility. From the moment the unit arrives at Airbag24, the processing time applies, which usually takes 3–4 working days.

On the test bench, defective components are replaced and a function test completes the work.

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 89170-24360 get to Airbag24?

Your way to Airbag24 leads via parcel shipping or a UPS collection that you book for an extra charge. The return is made by UPS.

Print the repair order and put it into the parcel; pack the control unit shock-proof.