Airbag control unit with part number 89170-30780

What does the airbag control unit 89170-30780 do?

The airbag control unit 89170-30780 is the central unit of the restraint system (SRS) for Lexus. It evaluates the signals from the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

The unit monitors the components of the system continuously. It shows detected faults via the airbag warning light.

If the control unit fails, the restraint system can no longer reliably perform its task. This is exactly why its function is so important.

Why does the control unit 89170-30780 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Ageing components, cold solder joints, moisture at plug connections and voltage spikes also play a role.

Stored crash data remains in the unit until it is erased during a repair. It is therefore the first point that an examination looks at.

Electronics age over time, and solder joints can go cold. Moisture attacks plug connections, and voltage spikes arise, for example, from a weak battery or jump-starting.

How can you tell that the 89170-30780 is defective?

The airbag warning light stays on constantly or intermittently, and an error message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

Typical signs at a glance:

• Airbag warning light stays on constantly or intermittently
• Error message in the instrument cluster
• Diagnostic tool finds no connection to the control unit
• Fault memory cannot be cleared

Have the system checked promptly if the light stays on after starting.

Which vehicles is the 89170-30780 fitted in?

The control unit 89170-30780 is fitted in these vehicles: Lexus GS S190 Facelift (2009-2011) and S190 (2005-2009).

The list shows the vehicles recorded for this number.

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

You can compare the part number on the label of the removed unit with this page, so that you have the right unit in front of you. Have the fault memory read out before removal. Only this shows whether the control unit 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 89170-30780 work?

First have the fault memory read out and attach the log. Then disconnect the battery, and only then remove the control unit. Processing at Airbag24 usually takes 3–4 working days.

After that, create a repair order online and send the unit in well packed. Airbag24 checks it on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit is sent back to you.

These 3–4 working days refer solely to the work at Airbag24.

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 89170-30780 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS. Put the printed repair order into the parcel, and pack the unit shock-proof.

Use a sturdy carton with padding material so that the unit stays protected during transit.