Airbag control unit with part number 89170-53820

What does the airbag control unit 89170-53820 do?

The airbag control unit 89170-53820 manages the restraint system (SRS) of Lexus. It receives the messages from the crash sensors, calculates within milliseconds in an accident which airbags and seatbelt pretensioners to trigger, and checks the system continuously for faults. Detected faults are shown via the airbag warning light.

Diagnosis is also part of its task: the unit records faults in the fault memory, which a workshop can read out.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-53820 fail?

The main reason for a failure is crash data stored after an accident, even if no airbag was triggered. It cannot be erased with a usual diagnostic tool. Airbag24 removes it during the repair.

Ageing of components can also play a role. Cold solder joints, moisture and corrosion on plug connections are likewise possible triggers.

Voltage spikes, for example from a weak battery or jump-starting, additionally stress the electronics and can cause faults.

How can you tell that the 89170-53820 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears on the display, or the diagnostic tool gets no connection to the control unit. If the fault memory cannot be cleared, a defect is likely.

With such signs you must reckon with the airbags and seatbelt pretensioners possibly not deploying in an emergency. A prompt diagnosis brings clarity.

Which vehicles is the 89170-53820 fitted in?

The control unit 89170-53820 is used at Lexus. It is fitted in these vehicles: Lexus LS XF50 (from 2018).

The vehicles known to us for this control unit are listed below.

• Lexus LS XF50 (from 2018)

Before you remove the control unit, read out the fault memory. That shows whether the unit itself causes the fault or a plug or cable does. Only then compare the part number on the label with this page.

For the same vehicles, we also repair control units with the part numbers 89170-50K81, 89170-50K83, 89970-50090.

How does the repair of the 89170-53820 work?

First read out the fault memory and attach the log. Then disconnect the battery, remove the control unit, create a repair order online and send the well-packed unit in.

Airbag24 checks the control unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Afterwards your own unit goes back 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 89170-53820 get to Airbag24?

You send the control unit 89170-53820 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends the unit back by UPS once the repair is complete.

The unit should arrive shockproof packed, with the printed repair order enclosed.