Airbag control unit with part number 89170-11000

What does the airbag control unit 89170-11000 do?

The airbag control unit 89170-11000 is the control unit of the restraint system (SRS) in Lexus. It processes the signals from the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the entire system continuously. Detected faults appear on the airbag warning light.

After an accident, it stores crash data and locks itself. The lock is lifted only with the repair.

In operation, the unit is active throughout and monitors the connected components.

Why does the control unit 89170-11000 fail?

The most common cause is crash data stored after an accident, even if no airbag has fired. Further causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

An ordinary diagnostic tool cannot delete crash data. Airbag24 deletes it during the repair. The other causes affect the electronics themselves and their connections: components age, solder joints can go cold, moisture attacks contacts, and voltage spikes stress the circuit, for example with a weak battery or when jump-started.

How can you tell that the 89170-11000 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool has no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then not trigger in an emergency.

These signs are clear enough to justify a check. The light shows the defect, and you should not ignore it.

Have the cause clarified as soon as the display appears.

In which vehicles is the 89170-11000 fitted?

The control unit 89170-11000 is fitted in this vehicle: Lexus LC URZ100 (from 2017).

The vehicle for this part number is shown in the following line:

• Lexus LC URZ100 (from 2017)

Compare the part number on the label of the removed unit with this page so that you have the right unit. Have the fault memory read out beforehand. Only this result shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-11020, 89170-11140, 89970-50100.

How does the repair of the 89170-11000 work?

You read out the fault memory and enclose the log. Then disconnect the battery, only afterwards remove the control unit and create a repair order online. Pack the unit well before sending it in. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a functional test. Afterwards you receive your own unit back.

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 89170-11000 get to Airbag24?

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

Enclose the printed repair order in the parcel and pack the unit shock-proof.