Airbag control unit with part number 89170-11030

What does the airbag control unit 89170-11030 do?

The airbag control unit 89170-11030 is the central control unit of the restraint system (SRS) for Lexus. It evaluates the signals from the crash sensors, decides on triggering airbags and seatbelt pretensioners within milliseconds in an accident, and monitors the system at all times.

It shows faults via the airbag warning light. After an accident it stores crash data and locks itself.

The electronics work with sensors, wires and triggering modules, so faults can arise at various points.

Why does the control unit 89170-11030 fail?

After an accident, stored crash data is the most common cause for 89170-11030, even if no airbag has deployed. Aged components, cold solder joints, moisture and corrosion at plug connections, as well as voltage spikes, are further causes.

The stored crash data remain in the control unit even if no airbag has opened. They cannot be deleted with a commercially available diagnostic tool, and Airbag24 removes them during the repair.

The other causes lie in the electronics and their connections. Components age, solder joints can go cold, and moisture or corrosion on plugs disturbs the signal. Voltage spikes, for example with a weak battery or a jump start, stress the electronics additionally.

How can you tell that the 89170-11030 is defective?

A defect on 89170-11030 shows up as the airbag warning light in the instrument cluster, a fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

The airbag warning light in the instrument cluster lights up constantly or intermittently. A fault message appears in parallel, pointing to a fault in the restraint system.

If no connection to the control unit is made or the fault memory remains unchanged, have the system checked promptly. Until then, airbags and seatbelt pretensioners may possibly not trigger in an emergency.

Which vehicles is the 89170-11030 fitted in?

The control unit 89170-11030 matches the stored models of Lexus. It is fitted in these vehicles: Lexus LC URZ100 (from 2017).

The known vehicles are listed below.

• Lexus LC URZ100 (from 2017)

Comparing the part number on the label of the removed unit with this page only tells you about the identity of the unit. Whether the control unit is defective or plugs and cables are the cause is shown only by the fault memory log read out beforehand.

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 89170-11030 work?

First have the fault memory read out and enclose the log. Then disconnect the battery from the vehicle electrical system, remove the control unit 89170-11030 and create the repair order online.

Send the unit only afterwards, packed in a sturdy box with padding. The sequence serves safety during removal.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. These steps usually take 3–4 working days at Airbag24.

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 89170-11030 get to Airbag24?

The control unit 89170-11030 reaches Airbag24 either as a parcel or via a UPS collection booked for an extra charge. After the repair, Airbag24 sends it back by UPS.

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