Airbag control unit with part number 89170-76500

What does the airbag control unit 89170-76500 do?

The airbag control unit 89170-76500 belongs to the restraint system (SRS) in the Lexus. It analyses the signals from the crash sensors, determines in an accident which airbags and seatbelt pretensioners fire, and monitors the entire system.

It signals detected faults via the airbag warning light in the instrument cluster. After an accident, it records the crash data and locks itself.

Why does the control unit 89170-76500 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are further possible causes.

The presence of crash data does not mean that an airbag has deployed. The unit also stores events in which nothing was triggered.

Aged components and cold solder joints cause intermittent faults. Moisture and corrosion change the transition at plug connections.

Voltage spikes arise, for example, with a weak battery or when starting with an external power source.

How can you tell that the 89170-76500 is defective?

A defect shows up in the airbag warning light, in error messages in the instrument cluster, and in a missing connection to the diagnostic tool. In a critical situation, the airbags and seatbelt pretensioners may then not be able to deploy.

The signs at a glance:

• Airbag warning light in the instrument cluster lights up constantly or intermittently
• Error message in the instrument cluster
• Diagnostic tool cannot find the control unit
• Fault memory remains and cannot be cleared

Which vehicles is the 89170-76500 fitted in?

The control unit 89170-76500 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

These models are on record for this part number:

• Lexus UX MZAA10 (from 2018)

The comparison of the part number on the label with this page confirms that you have the correct unit. Have the fault memory read out beforehand, because only the result shows whether the control unit itself is defective or whether a connector or cable is the cause.

How does the repair of the 89170-76500 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. You send the well-packed unit in, and Airbag24 usually processes it within 3–4 working days.

The removal takes place only after the battery has been disconnected. This sequence is prescribed for safety reasons.

At Airbag24 the unit is checked on the test bench. Defective components are replaced, crash data is erased, and finally a function test follows; afterwards your own unit is returned 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 89170-76500 get to Airbag24?

You send the control unit 89170-76500 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Put the printed repair order in the parcel and pack the unit shockproof.