Airbag control unit with part number 89170-76620

What does the airbag control unit 89170-76620 do?

The airbag control unit 89170-76620 is the central control unit of the restraint system (SRS) of Lexus. It evaluates the signals from the crash sensors, decides in the event of an accident whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit reports faults via the airbag warning light in the instrument cluster. This way, the status of the system stays visible.

After an accident, it stores crash data and locks itself. The lock is only lifted by the repair.

Why does the control unit 89170-76620 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes include:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

Airbag24 removes the crash data during the repair. Reading out or erasing the data on the vehicle does not anticipate this step.

The remaining causes tend to develop gradually and affect electronics and connections alike.

How can you tell that the 89170-76620 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. Additionally, a fault message appears in the instrument cluster, there is no connection to the diagnostic tool, and a fault memory that cannot be cleared.

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory cannot be cleared

As long as the warning light shows a fault, airbags and seatbelt pretensioners may not trigger in an emergency. Please look into a lit warning light promptly.

A single symptom does not reveal the cause. Reading out the fault memory shows whether the control unit is affected.

Which vehicles is the 89170-76620 fitted in?

The 89170-76620 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

The following vehicles are on record for this part number:

• Lexus UX MZAA10 (from 2018)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit.

Also have the fault memory read out in advance. Only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

How does the repair of the 89170-76620 work?

First, have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Afterwards, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

After that, you create a repair order online and send the unit in well packed. Airbag24 checks it on the test bench, replaces defective components and erases the crash data. A function test follows.

The 3–4 working days apply exclusively to the work at Airbag24. 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 89170-76620 get to Airbag24?

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

Put the printed repair order into the parcel. Pack the control unit so that it is shockproof.