Airbag control unit with part number 89170-76591

What does the airbag control unit 89170-76591 do?

The airbag control unit 89170-76591 runs the restraint system (SRS) in the Lexus. It processes the signals from the crash sensors, selects the airbags and seatbelt pretensioners that fire in a crash, and keeps the system under control.

If the system detects a fault, the airbag warning light in the instrument cluster comes on. An error message is also displayed there.

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

Why does the control unit 89170-76591 fail?

The most common cause of a 89170-76591 failure is crash data stored after an accident, even if no airbag has fired. Other factors include aged components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

The crash data remains in the unit, and a normal diagnostic tool cannot remove it.

Components age, solder joints can crack, and moisture attacks the contacts. Voltage spikes, for example from a weak battery or jump-starting, put additional strain on the electronics.

How can you tell that the 89170-76591 is defective?

If the airbag warning light in the instrument cluster stays on or comes on intermittently on the 89170-76591, this indicates a defect. It is accompanied by an error message, no connection to the diagnostic tool and a fault memory that cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

The warning light is the signal you should watch. Even a temporary illumination is reason enough to have the system examined.

A fault memory that cannot be reset also points to a malfunction that you should take seriously.

Which vehicles is the 89170-76591 fitted in?

The 89170-76591 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

These vehicles are known to us for this part number:

• Lexus UX MZAA10 (from 2018)

Comparing the part number on the label with this page only confirms that you have the right unit. Whether the control unit is actually defective or a connector or cable is the cause can only be shown by the fault memory, which you should have read out beforehand.

How does the repair of the 89170-76591 work?

First have the fault memory read out and attach the log to the unit. Then disconnect the battery before removing the control unit. Next, create a repair order online and pack the unit well for sending.

At Airbag24, the unit is checked on the test bench, defective components are repaired, the crash data is erased and a function test is carried out. The unit then goes back to you.

Processing at Airbag24 normally takes 3–4 working days, counted only for checking, repairing and testing.

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 89170-76591 get to Airbag24?

You send the control unit 89170-76591 as a package, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

The repair order is printed and placed in the package. You pack the unit so that it is shock-proof and arrives undamaged.