Airbag control unit with part number 89170-30720

What does the airbag control unit 89170-30720 do?

With Lexus, the airbag control unit 89170-30720 controls the restraint system (SRS). From the signals of the crash sensors it works out, in an accident, which airbags and seatbelt pretensioners trigger, and it continuously monitors the system. After an accident it stores crash data and locks itself.

During operation the unit checks continuously whether the system is in order. A detected fault is indicated via the airbag warning light in the instrument cluster.

Why does the control unit 89170-30720 fail?

Stored crash data is the most common cause, even when no airbag has deployed. A standard diagnostic tool cannot erase it; Airbag24 erases it during repair. Added to this are ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remain stored in the unit after the accident, regardless of whether an airbag deployed. The other causes concern the electronics themselves and their connections. Which of them applies only becomes clear when the fault memory is read out together with an inspection.

How can you tell that the 89170-30720 is defective?

The airbag warning light in the instrument cluster stays on constantly or lights up intermittently, accompanied by a fault message in the instrument cluster. The diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

Pay attention to whether the light only comes on when the ignition is switched on or stays on, and note the wording of the fault message.

Which vehicles is the 89170-30720 fitted in?

The control unit 89170-30720 is fitted in these vehicles: Lexus GS S190 Facelift (2009-2011) and S190 (2005-2009).

The list is the basis for your assignment and shows the vehicles that Airbag24 has assigned to this part number.

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

Matching the part number on the label with this page only ensures that it is the correct unit. Have the fault memory read out in advance, because only this result shows whether the control unit itself is defective or whether a plug or cable is the cause.

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

How does the repair of the 89170-30720 work?

First, have the fault memory read out and include the log. Then disconnect the battery, remove the control unit and create a repair order online.

Then send the well-packed unit in. Airbag24 checks it on the test bench, replaces defective components, erases the stored crash data and performs a function test. Processing usually takes 3–4 working days.

Only then is your own unit 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 89170-30720 get to Airbag24?

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

Include the printed repair order in the parcel and pack the unit shockproof.