Airbag control unit with part number 89170-76631

What does the airbag control unit 89170-76631 do?

This airbag control unit 89170-76631 manages the restraint system (SRS) for Lexus. Based on the crash sensors, it determines in a crash which airbags and seatbelt pretensioners are triggered.

During operation, it monitors the components continuously and shows faults via the airbag warning light.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 89170-76631 fail?

Stored crash data is the most common cause, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

The crash data stays in the unit's memory until it is removed during the repair.

Aged components and cold solder joints can lead to faults over a longer period.

Moisture and corrosion attack the plug connectors. Voltage spikes arise, for example, with a weak battery or from a jump start.

How can you tell that the 89170-76631 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, and error messages also appear in the instrument cluster. In addition, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may fail to deploy. Have the warning checked promptly.

Which vehicles is the 89170-76631 fitted in?

The control unit 89170-76631 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

The list shows the vehicles for this part number:

• Lexus UX MZAA10 (from 2018)

Comparing the part number on the label with this page only confirms that it is the right unit. Only the fault memory result shows whether the control unit itself is affected or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-76310, 89170-76320, 89170-76330, 89170-76340, 89170-76370, 89170-76380.

How does the repair of the 89170-76631 work?

First, have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit. Next, create a repair order online and send the unit in.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days.

Afterwards, your own unit comes back to you. 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 89170-76631 get to Airbag24?

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

The shock-resistant packaging and the printed repair order belong in the parcel.