Airbag control unit with part number 89170-76611

What does the airbag control unit 89170-76611 do?

The airbag control unit 89170-76611 coordinates the restraint system (SRS) in the Lexus. It reads the crash sensors, determines in an accident which airbags and seatbelt pretensioners fire, and checks the system continuously. After an accident, it stores crash data and locks itself.

The unit passes faults on to the airbag warning light in the instrument cluster. The decision about which devices respond rests solely on the sensor values.

Why does the control unit 89170-76611 fail?

The most common cause is stored crash data, even without a deployed airbag; it cannot be erased with a normal diagnostic tool. Further causes are ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump start.

The crash data stays in the memory until the repair removes it. A diagnostic tool with usual equipment cannot erase it; this task is carried out by the repair at Airbag24.

The other causes develop gradually. Ageing components, cold solder joints, moisture at the plugs and voltage spikes cannot be reliably narrowed down without testing.

How can you tell that the 89170-76611 is defective?

Typical signs are an airbag warning light that stays on permanently or intermittently, a fault message in the instrument cluster, a lack of contact between the diagnostic tool and the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not be able to deploy.

In detail, the following stands out:

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool without connection
• Fault memory cannot be cleared

This picture comes from the restraint system itself and cannot be ignored.

Which vehicles is the 89170-76611 fitted in?

The 89170-76611 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

The list shows the vehicles that are assigned to this part number:

• Lexus UX MZAA10 (from 2018)

Compare the part number on the label of the unit with this page; that only confirms it is the right unit. Read out the fault memory beforehand, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 89170-76611 work?

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

At Airbag24, the unit is checked on the test bench, defective components are replaced, the crash data is erased and a function test is run. The unit then 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 89170-76611 get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns the unit by UPS after the repair.

Print the repair order and put it in the parcel. The unit must be packed shockproof.