Airbag control unit with part number 89170-53860

What does the airbag control unit 89170-53860 do?

The airbag control unit 89170-53860 controls the restraint system (SRS) in vehicles from Lexus. The signals from the crash sensors are evaluated there, and in a crash the decision on airbags and seatbelt pretensioners is made within milliseconds. The system is monitored continuously.

The unit shows faults via the airbag warning light in the instrument cluster. After a crash, it stores crash data and locks itself.

In this way, the safety technology in the vehicle is controlled from a single point.

Why does the control unit 89170-53860 fail?

The most common cause is a stored crash data record after an accident, even if no airbag was triggered; a usual diagnostic tool cannot erase it. Alongside this, ageing components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes play a role.

The crash data record is stored in the unit after an accident and remains there until Airbag24 erases it during the repair. An ordinary diagnostic tool has no access to it.

The other causes concern the electronics and their connections. Ageing components and cold solder joints can trigger faults, moisture and corrosion affect the contacts, and voltage spikes from a weak battery or jump-starting stress the circuits.

How can you tell that the 89170-53860 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition, a fault message appears in the instrument cluster, the diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be cleared.

As long as these signs are present, the airbags and seatbelt pretensioners may not trigger in an emergency. The warning light is therefore a warning that must be taken seriously.

If you notice this finding, have the fault memory read out promptly so the cause can be narrowed down.

Which vehicles is the 89170-53860 fitted in?

The statement is based on part number 89170-53860. The airbag control unit 89170-53860 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The vehicles in which this unit is fitted are shown in the list:

• Lexus LS XF50 (from 2018)

A comparison of the part number on the label of the removed unit with this page only ensures that it is the correct unit. Whether the cause lies in the control unit, which is faulty, or in a plug or cable can only be clarified through the fault memory read out. So have it read out in advance.

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 89170-53860 work?

First have the fault memory read out and enclose the log with the parcel. Then disconnect the battery, remove the control unit and create a repair order online before you send in the well-packed unit. Airbag24 needs 3–4 working days for checking, repairing and testing as a rule.

Airbag24 checks the unit on the test bench, replaces defective components, erases the 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 89170-53860 get to Airbag24?

You send the unit as a parcel, or you book a UPS collection for an extra charge. Airbag24 returns the unit by UPS after the repair. The printed repair order goes into the parcel, and the unit is packed shockproof.

Good packaging protects the unit on the way to Airbag24 and back again.