Airbag control unit with part number 89170-48D00

What does the airbag control unit 89170-48D00 do?

The airbag control unit 89170-48D00 coordinates the restraint system (SRS) in Lexus vehicles. It receives the signals from the crash sensors and decides within milliseconds in an accident whether airbags and seatbelt pretensioners are triggered. It also monitors the system without interruption.

The evaluation continues in the background so that the system is always ready.

It shows detected faults via the airbag warning light. After an accident it stores crash data and locks itself.

Why does the control unit 89170-48D00 fail?

Stored crash data remains in the unit until Airbag24 deletes it during the repair. Until then, an ordinary diagnostic tool is not enough to remove it. Aged components, cold solder joints, moisture and voltage spikes are also possible causes.

Other causes are generally aged electronic components, cold solder joints, and moisture or corrosion at plug connections.

Voltage spikes, for example with a weak battery or jump-starting, also stress the unit. Which cause applies in each case only becomes clear during the inspection.

How can you tell that the 89170-48D00 is defective?

The airbag warning light lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool cannot reach the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

These signs indicate a defect:

• Airbag warning light lights up permanently
• Airbag warning light lights up only intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

If you notice one of these signs, have the fault memory read out before taking any further steps.

Which vehicles is the 89170-48D00 fitted in?

The control unit 89170-48D00 is fitted in these vehicles: Lexus RX AL20 Facelift (2019-2022) and AL20 (2015-2019). The reference basis is exactly this part number.

The following overview shows which models these are.

• Lexus RX AL20 Facelift (2019-2022)
• Lexus RX AL20 (2015-2019)

Compare the label on the removed unit with this page. This check only confirms the unit, not the cause. Therefore have the fault memory read out beforehand, because only that shows whether the control unit is defective or a connector or cable is affected.

For the same vehicles, we also repair control units with the part numbers 89170-0E021, 89170-0E260, 89170-48490, 89170-48890, 89170-48A00, 89170-48A10.

How does the repair of the 89170-48D00 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Afterwards create the repair order online, pack the unit well and send it in. At Airbag24, inspection, repair and testing usually take 3–4 working days.

Airbag24 examines the unit on the test bench, repairs defective components and deletes the crash data. A function test then follows.

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 89170-48D00 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair you receive the control unit back by UPS.

The printed repair order goes into the parcel, and the unit must be packed shock-resistant.