Airbag control unit with part number 89170-30530

What does the airbag control unit 89170-30530 do?

The airbag control unit 89170-30530 controls the restraint system (SRS) of Lexus. It continuously checks the crash sensors and decides in a fraction of a second in an accident which airbags and seatbelt pretensioners are triggered.

The control unit detects faults in the system itself and shows them via the airbag warning light in the instrument cluster. This keeps the condition of the system visible in everyday use, without needing a measuring device.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 89170-30530 fail?

The most common cause with 89170-30530 is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool does not remove it. Other causes are aged electronic components, cold solder joints, moisture and corrosion in plug connections, and voltage spikes from a weak battery or jump-starting.

Airbag24 erases the crash data during the repair. The unit is then checked on the test bench, so that the other causes are also identified.

The other causes all relate to electronics and connections. Solder joints and contacts change over the years, and moisture or salt attack the connections. An overvoltage from jump-starting or a voltage dip can also stress the circuits.

How can you tell that the 89170-30530 is defective?

A defect in the 89170-30530 shows itself through the airbag warning light in the instrument cluster, which lights up permanently or intermittently, through a fault message in the instrument cluster, through a missing connection to the diagnostic tool, or through a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light is the most important indication, because the control unit reports the fault itself. It therefore lights up exactly when the system has detected something, and not only at a later check.

A missing connection to the diagnostic tool is also a sign that something is wrong. The unit then cannot be read out, and the fault memory remains unreadable until the cause is found.

Which vehicles is the 89170-30530 fitted in?

The 89170-30530 is fitted in these vehicles: Lexus GS S190 Facelift (2009-2011) and S190 (2005-2009).

The known installations for this part number are compiled here:

• Lexus GS S190 Facelift (2009-2011)
• Lexus GS S190 (2005-2009)

Compare the part number on the label of the removed unit with this page. This only establishes that it is the correct unit. Whether the control unit is defective, or whether a plug or cable is the cause, is shown by the fault memory, which you have read out beforehand.

For the same vehicles, we also repair control units with the part numbers 89170-30B30, 8917030630.

How does the repair of the 89170-30530 work?

In the repair of the 89170-30530, you first have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Online, you then create a repair order and send the unit in well packed. Airbag24 checks it, replaces defective components and carries out a function test, after which the unit goes back to you.

The order of the first steps serves safety. Please keep to it exactly, even if you want to get the removal done quickly.

Processing at Airbag24 usually takes 3–4 working days. This covers checking, repairing and testing in our workshop.

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 89170-30530 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the control unit back to you by UPS.

Place the printed repair order in the parcel and pack the control unit shock-proof, so that transport does not damage it.