Airbag control unit with part number 89170-48C50

What does the airbag control unit 89170-48C50 do?

The 89170-48C50 is the central control unit of the SRS in Lexus. It evaluates the crash sensors and determines in an accident which airbags and seatbelt pretensioners are triggered.

The unit monitors the system throughout and reports faults via the airbag warning light. The triggering decision is made within milliseconds.

After an accident, it stores crash data and locks itself. Only the repair lifts this lock.

Why does the control unit 89170-48C50 fail?

Crash data from an accident stored by the 89170-48C50 is the most common cause of failure, even if no airbag was triggered. Ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also involved.

Such data cannot be erased with a normal diagnostic tool. It is therefore removed by Airbag24 as part of the repair.

Aged electronics and moisture act over a longer period, while voltage spikes, for example from a weak battery or a jump start, place a short-term load on the system.

How can you tell that the 89170-48C50 is defective?

A defect in the 89170-48C50 shows as the airbag warning light in the instrument cluster staying on permanently or intermittently, along with further clear indications.

The following signs appear in detail:

• fault message in the instrument cluster
• diagnostic tool gets no connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may then fail to trigger, so these signs must be taken seriously.

Which vehicles is the 89170-48C50 fitted in?

Check the fit with your vehicle first using the list. The 89170-48C50 is fitted in these vehicles: Lexus LX URJ200 (2008-2021).

The following models are listed for this part number:

• Lexus LX URJ200 (2008-2021)

Compare the part number on the label of the unit with this page, and you will see that it is the right unit.

Then have the fault memory read out, because only this result shows whether the control unit itself is defective or a plug or cable is the cause.

How does the repair of the 89170-48C50 work?

First read out the fault memory of the 89170-48C50 and enclose the log with the unit. Then disconnect the battery, remove the control unit and create a repair order online. Finally, send in the well-packed unit.

Airbag24 tests the unit on the test bench, replaces defective components, erases the crash data and carries out a function test. The unit then goes back to you repaired.

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 89170-48C50 get to Airbag24?

You send the 89170-48C50 to Airbag24 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit to you by UPS.

Enclose the printed repair order with the parcel, and pack the control unit shock-proof.