Airbag control unit with part number 89170-30F90

What does the airbag control unit 89170-30F90 do?

The airbag control unit 89170-30F90 processes the signals from the crash sensors for Lexus and thereby controls the SRS restraint system. In an accident, it decides within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident, it also stores crash data and locks itself.

Ongoing monitoring detects faults in the restraint system and shows them via the airbag warning light.

In an emergency, the control unit also triggers the seatbelt pretensioners, so they are part of its function.

Why does the control unit 89170-30F90 fail?

The most common cause: crash data stored after an accident, even if no airbag has deployed, which a standard diagnostic tool does not remove. Aged electronic components, cold solder joints, moisture and corrosion at plugs and voltage spikes are also possible causes. Airbag24 erases the crash data as part of the repair.

The control unit records the incident in its memory, even if no airbag has deployed.

The other causes lie in the electronics and their connections. Aged components and cold solder joints can disrupt function, and moisture or corrosion at plugs degrades the contact.

Voltage spikes are another factor, for example with a weak battery or a jump start.

How can you tell that the 89170-30F90 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as there is a fault in the 89170-30F90. A fault message in the instrument cluster appears alongside it. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be erased.

In an emergency, airbags and seatbelt pretensioners may fail to deploy. For this reason, take the warning seriously and do not postpone the check until the next appointment.

The warning comes from the control unit itself and therefore relates directly to the restraint system.

Which vehicles is the 89170-30F90 fitted in?

Model and year of manufacture determine whether the part is fitted in your vehicle. The 89170-30F90 is fitted in these vehicles: Lexus GS L10 (2012-2015) and L10 Facelift (2015-2020).

The assignment as a list:

• Lexus GS L10 (2012-2015)
• Lexus GS L10 Facelift (2015-2020)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Also have the fault memory read out beforehand, because 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 89170-30F90 work?

First have the fault memory read out and attach the log, then disconnect the battery. Only after that do you remove the control unit, and then create a repair order online. Finally, send the unit in, carefully packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards, the repaired unit returns to you.

Processing at Airbag24 takes 3–4 working days as a rule, and this covers only checking, repairing and testing.

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 89170-30F90 get to Airbag24?

You can send the control unit 89170-30F90 as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

A printed repair order goes into the parcel, and you pack the unit shock-proof.