Airbag control unit with part number 89170-76780

What does the airbag control unit 89170-76780 do?

The airbag control unit 89170-76780 is the control unit of the SRS system for Lexus. It processes the readings from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners within milliseconds in an accident.

While driving, it continuously checks all components of the system. If it detects a fault, the airbag warning light in the instrument cluster shows it. After an accident, it stores crash data and locks itself.

Why does the control unit 89170-76780 fail?

The most common cause with the 89170-76780 is crash data stored after an accident, even if no airbag was triggered. Other triggers are aging components, cold solder joints, moisture with corrosion and voltage spikes.

Crash data stays in the unit until someone removes it. An ordinary diagnostic tool cannot do that. Airbag24 erases it as part of the repair.

Aging electronics, cold solder joints and corrosion on plugs are among the causes that develop gradually.

Voltage spikes, for example from a weak battery or a jump-start, can also affect the unit.

How can you tell that the 89170-76780 is defective?

On the 89170-76780, defects show up through the airbag warning light, which lights up permanently or intermittently, through fault messages in the instrument cluster, through a missing connection to the diagnostic tool and through a fault memory that cannot be cleared.

With such signs, airbags and seatbelt pretensioners may not deploy in an emergency.

• Airbag warning light stays on permanently
• Airbag warning light comes on intermittently
• Fault message in the instrument cluster
• no contact between the diagnostic tool and the control unit
• fault memory cannot be cleared

Which vehicles is the 89170-76780 fitted in?

The 89170-76780 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

The list of models follows directly below.

• Lexus UX MZAA10 (from 2018)

Match the part number on the label of the unit with this page. That only confirms the assignment to the right unit. What matters next is the fault memory: have it read out, and it will show whether the control unit is defective or whether a plug or cable is causing the fault.

How does the repair of the 89170-76780 work?

For the repair of the 89170-76780, first have the fault memory read out and enclose the log. Then disconnect the battery and only now remove the control unit. Afterwards, create a repair order online and pack the unit well before sending it in.

Airbag24 examines the unit on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Processing at Airbag24 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 89170-76780 get to Airbag24?

You send the control unit 89170-76780 to Airbag24 as a parcel or book a UPS collection for an extra charge. The return shipment is made by UPS.

The printed repair order goes into the parcel, and the unit must be packed shockproof.