Airbag control unit with part number 89170-76330

What does the airbag control unit 89170-76330 do?

The airbag control unit 89170-76330 is used for the restraint system (SRS) in Lexus. It registers the impact via the crash sensors, decides on the triggering of airbags and seatbelt pretensioners, and keeps the system under control. After an accident, it stores crash data and locks itself.

The calculation takes place within milliseconds. The control unit reports faults via the airbag warning light in the instrument cluster.

Otherwise it works without any intervention by the driver. The electronics remain active for this purpose the whole time.

Why does the control unit 89170-76330 fail?

For the control unit 89170-76330, stored crash data is the most common cause, even when no airbag has deployed. Further possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a standard diagnostic tool. It is removed at Airbag24 as part of the repair.

The other causes in detail:

• ageing components in the electronics
• cold solder joints
• moisture and corrosion at plugs
• voltage spikes from the vehicle electrical system

How can you tell that the 89170-76330 is defective?

The airbag warning light either stays on continuously or comes on only now and then when the 89170-76330 has a defect. An error message appears alongside it, the diagnostic tool cannot reach the control unit, or the fault memory remains. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

That the light comes on only now and then is no all-clear. Even a brief illumination means that the system has detected something.

Which vehicles is the 89170-76330 fitted in?

The control unit 89170-76330 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

The vehicles included are shown in this overview:

• Lexus UX MZAA10 (from 2018)

A comparison of the part number on the label with this page only confirms the unit, not the fault. That is why having the fault memory read out first is the more important step, because the log shows whether the control unit itself is defective or whether a plug or cable is behind the fault.

How does the repair of the 89170-76330 work?

First have the fault memory read out on the 89170-76330 and attach the log to the unit. Then disconnect the battery and only afterwards remove the control unit. Finally, create the repair order online and pack the unit carefully for sending.

At Airbag24, processing usually takes 3–4 working days. The unit is checked, defective components are repaired, crash data is erased and a function test is carried out. 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 89170-76330 get to Airbag24?

You send the 89170-76330 to Airbag24 as a parcel yourself, or you book a UPS collection for an extra charge. Airbag24 then returns the repaired unit to you by UPS.

Enclose the printed repair order with the parcel. The control unit must be packed in a shock-proof way.