Airbag control unit with part number 89170-76601

What does the airbag control unit 89170-76601 do?

The 89170-76601 is the evaluation unit of the restraint system (SRS) in Lexus. In a crash it checks the crash sensors and determines within a fraction of a second which airbags and seatbelt pretensioners are triggered.

While driving, it monitors the system continuously. It shows faults via the airbag warning light in the instrument cluster.

After a crash the unit stores crash data and locks itself. The lock only ends with the repair.

Why does the control unit 89170-76601 fail?

Stored crash data is the most common cause on the 89170-76601, even if no airbag has deployed. Other causes are aged components, cold solder joints, moisture at plug connections and voltage spikes. Airbag24 erases the crash data during the repair.

Beyond that, the electronics themselves and their environment play a role. Aged components, cold solder joints as well as moisture and corrosion at plug connections can impair the function.

Voltage spikes also belong here, for example when the battery is weak or the vehicle is started with a jump start.

How can you tell that the 89170-76601 is defective?

If the airbag warning light in the instrument cluster stays on permanently or intermittently, this indicates a defect in the 89170-76601. In addition an error message then appears in the instrument cluster, the diagnostic tool does not reach the 89170-76601, and the fault memory cannot be cleared.

This indication comes directly from the unit itself. It shows you that the system has detected a fault.

As long as the defect persists, airbags and seatbelt pretensioners may not deploy in an emergency.

Which vehicles is the 89170-76601 fitted in?

The 89170-76601 is found in these models: Lexus UX MZAA10 (from 2018).

A list with the vehicle details follows.

• Lexus UX MZAA10 (from 2018)

Comparing the part number on the label of the removed unit with this page only confirms that you have the matching unit. Whether the control unit is defective is shown only by the fault memory. Have it read out before sending the unit in, because a plug or a cable can also be 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 89170-76601 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. Afterwards the unit goes 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 89170-76601 get to Airbag24?

For shipping you can send the 89170-76601 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends the unit back by UPS.

Put the printed repair order into the parcel and pack the control unit shock-proof.