Airbag control unit with part number 89170-76660

What does the airbag control unit 89170-76660 do?

The airbag control unit 89170-76660 coordinates the restraint system (SRS) in the Lexus vehicle. The crash sensors supply it with measured values continuously, and in an impact it decides within milliseconds which airbags and seatbelt pretensioners are triggered.

In the background, the unit checks all connected components continuously. If it detects a fault, it reports this via the airbag warning light.

After an accident, it stores crash data and locks itself. Only the repair lifts the lock.

Why does the control unit 89170-76660 fail?

The most common cause for the 89170-76660 is crash data stored after an accident, even without a triggered airbag. A normal diagnostic tool cannot delete it. Aged electronic components, cold solder joints, moisture and corrosion at plugs, and voltage spikes are also to blame.

As long as the crash data is stored in the memory, the fault persists, even if the rest of the electronics work perfectly.

The other causes relate to the components inside the unit and its plug connections. Aged components and cold solder joints impair function, while moisture and corrosion disrupt the electrical contact. Voltage spikes occur, for example, when the battery is weak or a jump-start is connected.

How can you tell that the 89170-76660 is defective?

The airbag warning light in the instrument cluster indicates a defect in the 89170-76660 by lighting up permanently or intermittently. In addition, there may be an error message in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared.

Typical signs at a glance:

• Airbag warning light on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then not trigger. Such a finding should therefore be clarified promptly.

Which vehicles is the 89170-76660 fitted in?

With Lexus, this unit is standard equipment in the models listed. The airbag control unit 89170-76660 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

Here are the models in detail:

• Lexus UX MZAA10 (from 2018)

It makes sense to first compare the part number on the label of the device with this page. This only confirms that you have removed the right unit. Whether it is actually defective only becomes clear from the fault memory read out beforehand, because a plug or cable can also be the cause.

How does the repair of the 89170-76660 work?

You first read out the fault memory and attach the log. Then disconnect the battery, remove the control unit and create the repair order online. Processing at Airbag24 usually takes 3–4 working days.

Before removal, switch off the vehicle and disconnect the battery. Only then take out the control unit and pack it well before sending it in.

At Airbag24, the unit is examined on the test bench. Defective components are replaced, the stored crash data is deleted and a function test is carried out. Afterwards, your own 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 89170-76660 get to Airbag24?

You can send the control unit 89170-76660 as a parcel, or hand it over for an extra charge through a UPS collection. Airbag24 sends it back to you by UPS after the repair.

The printed repair order belongs in the parcel. The unit should be packed to resist impact, so that it arrives undamaged.