Airbag control unit with part number 89170-30G50

What does the airbag control unit 89170-30G50 do?

In vehicles from Lexus, the airbag control unit 89170-30G50 coordinates the restraint system (SRS). It reads the signals from the crash sensors, determines in a crash which airbags and seatbelt pretensioners are triggered, and does so within milliseconds. It also checks the system continuously for faults.

The unit reports faults via the airbag warning light in the instrument cluster, which you see in everyday use.

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

Why does the control unit 89170-30G50 fail?

Most often the cause is crash data from an accident, even if no airbag has deployed; these cannot be erased with a normal diagnostic tool. Further causes are ageing of the components, moisture and voltage spikes.

Only reading out the fault memory shows in each case which of these causes applies.

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes from a weak battery or jump-starting

An accident without a deployed airbag can also leave crash data behind, so looking at the memory is always worthwhile.

How can you tell that the 89170-30G50 is defective?

The airbag warning light in the instrument cluster stays on or flashes intermittently. In addition there are fault messages, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not be able to trigger.

The warning light reports the defect directly in the vehicle.

Whether the control unit itself or the wiring is affected is shown only by a diagnosis.

Which vehicles is the 89170-30G50 fitted in?

The 89170-30G50 is fitted in these vehicles: Lexus GS L10 (2012-2015) and L10 Facelift (2015-2020).

The following vehicles are assigned to this part number:

• 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; that only confirms whether it is the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 89170-30G50 work?

First have the fault memory read out and enclose the log with the parcel. Then disconnect the battery and only then remove the control unit. Next create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The unit then goes back to you.

Processing at Airbag24 usually takes 3–4 working days.

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 89170-30G50 get to Airbag24?

You pack the control unit shockproof and send it off as a parcel, or have it collected by UPS for an extra charge. After the repair Airbag24 sends it back to you by UPS.

The printed repair order belongs in the parcel.