Airbag control unit with part number 89170-30550

What does the airbag control unit 89170-30550 do?

The airbag control unit 89170-30550 handles the evaluation within the restraint system (SRS) in Lexus. It reads the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors the system during operation. After an accident it stores crash data and locks itself.

If the device detects a fault, it reports it via the airbag warning light in the instrument cluster. This tells you that something in the restraint system is not right.

Because all deployments run through this control unit, a defect affects the entire system and not just individual parts of it.

Why does the control unit 89170-30550 fail?

Most often the causes lie in stored crash data that arose after an accident, even if no airbag has deployed. With this control unit, deleting the crash data is often not possible; anyone who wants it deleted should contact Airbag24 briefly before sending the unit in, so that the part number can be checked.

A standard diagnostic tool cannot erase the crash data. The fact that no airbag has deployed does not mean that nothing was stored.

The other causes concern the electronics themselves. Aged components, cold solder joints, moisture and corrosion at connectors can impair the function.

Voltage spikes occur, for example, with a weak battery or when a jump start is carried out. Such loads can damage components in the control unit.

How can you tell that the 89170-30550 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently as soon as the system detects a fault. Further signs may occur together or individually.

These signs at a glance:

• Airbag warning light lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool has no connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may fail to deploy in the event of a defect. The warning light should therefore be taken seriously, even if the vehicle seems normal.

Which vehicles is the 89170-30550 fitted in?

The control unit 89170-30550 is fitted for Lexus in these vehicles: Lexus GS S190 Facelift (2009-2011) and S190 (2005-2009).

The list shows the vehicles that are specified for this unit.

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

Comparing the part number on the label of the removed unit with this page only confirms that you have the correct unit in front of you. Have the fault memory read out before removal, because only then can it be determined whether the control unit is defective or whether a connector or cable is causing the fault.

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

How does the repair of the 89170-30550 work?

First have the fault memory read out and enclose the log, then disconnect the battery and remove the control unit. Then create a repair order online and send in the well-packed device. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 tests the device on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Afterwards your own unit is returned to you.

If you would like the crash data deleted, contact Airbag24 briefly before sending the unit in. 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 89170-30550 get to Airbag24?

You send the device as a parcel to Airbag24 or book a UPS collection for an extra charge. After the repair, your own unit is returned to you by UPS.

Enclose the printed repair order in the parcel, and pack the control unit shock-proof.