Airbag control unit with part number 89170-76490

What does the airbag control unit 89170-76490 do?

The airbag control unit 89170-76490 coordinates the restraint system (SRS) at Lexus. It reads the crash sensors and, in an accident, selects the airbags and seatbelt pretensioners within milliseconds and monitors the system permanently.

Faults in the system are reported via the airbag warning light. Monitoring continues in the background as long as the vehicle is in operation.

After an accident the unit stores crash data and locks itself. This lock is lifted only by a repair.

Why does the control unit 89170-76490 fail?

The most common cause is stored crash data after an accident, even when no airbag has triggered. A normal diagnostic tool cannot erase it. Also involved are aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

• aged electronic components
• cold solder joints on the circuit board
• moisture and corrosion on the plugs
• voltage spikes, for example from a weak battery or a jump-start

Whichever cause applies to your unit is shown only by the test.

How can you tell that the 89170-76490 is defective?

A defect on the 89170-76490 shows itself through the airbag warning light, which lights up permanently or intermittently, through a fault message in the instrument cluster, through a diagnostic tool without connection, and through a fault memory that cannot be cleared.

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

In an emergency, airbags and seatbelt pretensioners may possibly not trigger in the event of a defect. A prompt check is therefore advisable.

Which vehicles is the 89170-76490 fitted in?

The 89170-76490 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

The following list names the vehicles recorded for this part number.

• Lexus UX MZAA10 (from 2018)

Compare the part number on the label of the removed unit with this page. That only confirms the right unit. Whether the control unit is defective, or a connector or cable is the cause, is shown by the read-out fault memory.

How does the repair of the 89170-76490 work?

On the 89170-76490, have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit. Next, create the repair order online and send the unit in well packed. Airbag24 checks it on the test bench, replaces defective components, erases the crash data and carries out a function test.

Your unit is then returned to you. Processing takes 3–4 working days at Airbag24.

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 89170-76490 get to Airbag24?

You send the 89170-76490 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.