Airbag control unit with part number 89170-76370

What does the airbag control unit 89170-76370 do?

The airbag control unit 89170-76370 coordinates the restraint system of Lexus. It reads the signals from the crash sensors, selects the appropriate airbags and seatbelt pretensioners within milliseconds in a crash, and reports faults via the airbag warning light.

Whether an accident calls for triggering is decided by the unit based on the measured deceleration. Several sensor values are compared for this. Outside an accident, the control unit checks the system continuously, so that it is ready for an emergency.

After an accident the unit creates crash data and then locks itself.

Why does the control unit 89170-76370 fail?

For the 89170-76370, crash data stored after an accident is the most common cause, even if no airbag has deployed. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

A standard diagnostic tool cannot clear this crash data, so the unit keeps reporting the fault. During the repair at Airbag24, the crash data is cleared.

The remaining triggers relate to age, moisture and the power supply. Electronics change over the years, cold solder joints can lose contact, and moisture promotes corrosion on plugs. Which cause applies in the individual case is determined by the fault memory.

How can you tell that the 89170-76370 is defective?

A defect in the 89170-76370 shows up as the airbag warning light in the instrument cluster, as error messages there, as a diagnostic tool that fails to connect, or as a fault memory that cannot be cleared.

Pay particular attention to the following signs:

• airbag warning light that stays on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool that cannot connect to the control unit
• fault memory that cannot be emptied despite attempts to clear it

In an emergency, airbags and seatbelt pretensioners may then fail to deploy. Clarify the cause promptly.

Which vehicles is the 89170-76370 fitted in?

The airbag control unit 89170-76370 is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

The list shows the vehicles that Airbag24 has assigned to this part number.

• Lexus UX MZAA10 (from 2018)

Compare the number on the label of the removed unit with this page. This only shows that you have the correct unit in hand. Also read out the fault memory before you change anything on the vehicle. Only this log shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 89170-76370 work?

You have the fault memory of the 89170-76370 read out and enclose the log, then disconnect the battery and remove the unit. Afterwards create a repair order online and send in the control unit well packed.

The order protects you: the control unit may only be removed once the battery is disconnected. After arrival at Airbag24, we check the unit on the test bench, replace defective components, clear stored crash data and carry out a function test.

Processing at Airbag24 usually takes 3–4 working days. 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 89170-76370 get to Airbag24?

You send the control unit 89170-76370 in as a package, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Pack the printed repair order with the package and pack the control unit shock-proof.