Airbag control unit with part number 89170-0W040

What does the airbag control unit 89170-0W040 do?

In vehicles from Lexus this unit controls the restraint system (SRS) and is therefore responsible for airbags and seatbelt pretensioners. It reads the crash sensors and decides in an accident which components are triggered.

The evaluation takes place within milliseconds, and the system is checked continuously while driving. Faults that occur are shown by the airbag warning light in the instrument cluster.

After an accident the unit writes crash data to its memory and locks itself. The memory thus remains the starting point if problems occur later.

Why does the control unit 89170-0W040 fail?

Stored crash data can be the trigger, and this is also the case when no airbag has deployed. A normal diagnostic tool cannot remove this data.

Airbag24 deletes the crash data during the repair. This step is a fixed part of the repair of the unit.

Beyond that, general causes can play a role. Aged electronic components, cold solder joints, and moisture and corrosion at plug connections all belong here. Voltage spikes, for example from a weak battery or a jump start, can also affect the unit.

How can you tell that the 89170-0W040 is defective?

A defect shows mainly at the airbag warning light, which stays on permanently or at times, and at fault messages in the instrument cluster. A failed connection to the diagnostic tool or a fault memory that cannot be cleared are also signs.

• airbag warning light on permanently or at times
• fault message in the instrument cluster
• no connection to the diagnostic tool
• fault memory cannot be cleared

As long as the control unit is defective, airbags or seatbelt pretensioners may fail to trigger in an emergency.

Which vehicles is the 89170-0W040 fitted in?

The control unit 89170-0W040 is fitted in these vehicles: Lexus RX XU10 (1997-2000). The part number on the label is the most reliable comparison.

The list of vehicles for this part number follows below.

• Lexus RX XU10 (1997-2000)

Before you remove the unit, compare the part number on the label with the list. It is also worth having the fault memory read out in advance, so that it is clear whether the control unit is actually the cause or a plug or cable is.

How does the repair of the 89170-0W040 work?

First read out the fault memory and attach the log, then disconnect the battery and remove the control unit. Create the repair order online, then pack the unit well and send it in.

Airbag24 checks the unit, repairs defective components on the circuit board, deletes the stored crash data and carries out a function test. The unit then comes 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 89170-0W040 get to Airbag24?

Shipping is made as a parcel to Airbag24, optionally with a UPS collection for an extra charge. The return after the repair is made by UPS.

The printed repair order is also enclosed in the parcel. The control unit should be packed shockproof so that it arrives undamaged.