Airbag control unit with part number 89170-06B40

What does the airbag control unit 89170-06B40 do?

The airbag control unit 89170-06B40 controls the restraint system (SRS) of Lexus as a central unit. It evaluates the signals from the crash sensors, decides in an accident within milliseconds on airbags and seatbelt pretensioners, and monitors the system continuously. It shows faults via the airbag warning light.

Between journeys the unit checks the connections to all components. After an accident it stores crash data and locks itself.

Why does the control unit 89170-06B40 fail?

The most frequent cause is crash data stored after an accident, even if no airbag was triggered; a standard diagnostic tool cannot erase it. Further causes at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion at connectors
• voltage spikes, for example from a weak battery or jump-starting

The crash data remains stored in the unit and is therefore the first thing checked in any search for the cause.

How can you tell that the 89170-06B40 is defective?

A defect shows up as the airbag warning light staying on permanently or intermittently, and as an error message in the instrument cluster. A diagnostic tool without connection to the control unit or a fault memory that cannot be cleared is also among the signs.

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

In an emergency, airbags and seatbelt pretensioners may not deploy. Have such signs checked promptly.

Which vehicles is the 89170-06B40 fitted in?

The control unit 89170-06B40 is fitted in these vehicles: Lexus ES AXZH60 (from 2018). You carry out the comparison with your vehicle using the details in this section.

The assignment to this part number is shown in the following list.

• Lexus ES AXZH60 (from 2018)

Compare the part number on the label of the removed unit with this page. That ensures you have the right unit, nothing more. Have the fault memory read out beforehand, because only the result shows whether the control unit itself or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-06820, 89170-06850, 89170-06880, 89170-33B90, 89170-33C30, 89170-33C50.

How does the repair of the 89170-06B40 work?

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

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Afterwards your own unit is 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 89170-06B40 get to Airbag24?

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

Enclose the printed repair order and pack the unit shock-proof.