Airbag control unit with part number 89170-24180

What does the airbag control unit 89170-24180 do?

The airbag control unit 89170-24180 is the central control unit of the restraint system (SRS) for Lexus. In an accident, it checks the crash sensors and determines within milliseconds which airbags and seatbelt pretensioners are triggered.

It monitors the entire system during operation and reports faults via the airbag warning light.

After an accident, it stores crash data and locks itself.

Why does the control unit 89170-24180 fail?

With 89170-24180, the most common cause after an accident is stored crash data, even without an airbag having deployed. Other causes include ageing electronics, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data cannot be deleted with a normal diagnostic tool. Airbag24 deletes it during the repair.

The other causes in brief:

• Ageing electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 89170-24180 is defective?

On the 89170-24180, the airbag warning light comes on permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

• Airbag warning light, on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool without connection to the control unit
• Fault memory cannot be cleared

If the warning light comes on, have the fault memory read out.

Which vehicles is the 89170-24180 fitted in?

The airbag control unit 89170-24180 is associated with Lexus and is fitted in these vehicles: Lexus RC ASC10 (2015-2018) and ASC10 Facelift (from 2018).

The list gives an overview of the vehicles:

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

You compare the part number on the label with this page before removal. This only confirms that you have the correct unit. Whether the control unit is defective or a plug or cable is the cause is shown by the fault memory, which you should have read out beforehand.

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 89170-24180 work?

First have the fault memory read out and attach the log; the log goes into the parcel. Then disconnect the battery and only afterwards remove the control unit 89170-24180. At Airbag24, checking, repairing and testing usually take 3–4 working days.

Then create a repair order online and pack the unit well before sending it in.

There, the unit is checked, defective components are replaced where necessary, the crash data is deleted and a function test is carried out.

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 89170-24180 get to Airbag24?

The shipping options are a parcel or a UPS collection for an extra charge. Airbag24 returns the control unit 89170-24180 to you by UPS after the repair.

Include the printed repair order in the parcel and pack the unit shockproof.