Airbag control unit with part number 89170-50L01

What does the airbag control unit 89170-50L01 do?

The airbag control unit 89170-50L01 processes the signals from the crash sensors at Lexus and thereby controls the restraint system (SRS). In an accident it decides within milliseconds which airbags and seatbelt pretensioners fire. It also checks the system continuously and shows faults via the airbag warning light.

After an accident the unit stores crash data and locks itself.

That a fault in the control unit affects the entire restraint system is due to its central role in evaluating the data.

Why does the control unit 89170-50L01 fail?

On the 89170-50L01, the most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture at plug connections and voltage spikes.

A normal diagnostic tool cannot access stored crash data. At Airbag24 it is removed during the repair.

Voltage spikes can arise, for example, with a weak battery or after a jump start. Aged components and moisture, by contrast, act on the unit over a long period.

How can you tell that the 89170-50L01 is defective?

A defect in the 89170-50L01 shows mainly through the airbag warning light in the instrument cluster, which lights up permanently or intermittently. Other indications also point to a fault as soon as they appear.

The signs in detail:

• message in the instrument cluster that the airbag system is faulty
• diagnostic tool cannot find the control unit
• fault memory cannot be erased
• warning light stays on after the engine starts

While a fault persists, airbags and seatbelt pretensioners may not deploy in an emergency. Please have the finding checked promptly.

Which vehicles is the 89170-50L01 fitted in?

The 89170-50L01 is fitted in these vehicles: Lexus LS XF50 (from 2018).

The list records which vehicles are known to us for this number:

• Lexus LS XF50 (from 2018)

Comparing the label number with this page only confirms that the removed unit is the right one. Before removal, also have the fault memory read out, because only this result shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-50K81, 89170-50K83, 89170-50L00, 89170-50L03, 89170-53790, 89170-53820.

How does the repair of the 89170-50L01 work?

For the 89170-50L01, first have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit; afterwards 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 and erases stored crash data.

A function test follows, after which the unit goes back to you. The sequence serves safety during all work on the vehicle.

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 89170-50L01 get to Airbag24?

You send the 89170-50L01 to Airbag24 yourself as a parcel, or you book a UPS collection for an extra charge. After the repair it comes back to you by UPS.

Print out the repair order and put it in the parcel. Pack the control unit shockproof so that nothing gets damaged.