Airbag control unit with part number 89170-24190

What does the airbag control unit 89170-24190 do?

At Lexus, the airbag control unit 89170-24190 is the central control unit of the restraint system (SRS). It evaluates the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners to deploy, and monitors the system continuously. Faults are shown via the airbag warning light.

During operation, the control unit checks wiring, sensors and igniters. A detected fault is stored in the fault memory, which a diagnostic tool can read out.

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

Why does the control unit 89170-24190 fail?

The most common cause is stored crash data after an accident, even without an airbag deployment. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes, for example from jump-starting.

A normal diagnostic tool cannot erase crash data. Airbag24 removes it during the repair.

The other causes relate to the age of the components, moisture in the vehicle and the on-board voltage. Weak batteries in particular generate voltage spikes that can damage the electronics.

How can you tell that the 89170-24190 is defective?

The first sign is an airbag warning light in the instrument cluster that stays on permanently or intermittently. It can be accompanied by an error message, a diagnostic tool with no connection, and a fault memory that cannot be erased.

The warning light makes the defect visible. In that case, airbags and seatbelt pretensioners may fail to deploy in an accident, so you should take the warning seriously.

As soon as any of these signs appears, an inspection of the system is advisable.

Which vehicles is the 89170-24190 fitted in?

The control unit 89170-24190 is fitted at Lexus in these vehicles: Lexus RC ASC10 (2015-2018) and ASC10 Facelift (from 2018).

Here is an overview of the models:

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

Two steps come before removal. Comparing the part number on the label with this page is purely a check that it is the right unit. Have the fault memory read out, because only the result shows whether the control unit is defective or a connector or 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 89170-24190 work?

You read out the fault memory and enclose the log with the unit. Then you disconnect the battery and only then remove the control unit. Online, you create the repair order, then you send in the well-packed unit.

At Airbag24, the unit is examined on the test bench, defective components are replaced and crash data is erased. A function test completes the work.

Processing at Airbag24 usually takes 3–4 working days, after which your own unit is returned. 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 89170-24190 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.