Airbag control unit with part number 89170-48C00

What does the airbag control unit 89170-48C00 do?

The airbag control unit 89170-48C00 is the control unit of the restraint system (SRS) in the Lexus. It evaluates the signals from the crash sensors, triggers the right airbags and seatbelt pretensioners within milliseconds in a crash, and monitors the system continuously.

The unit reports faults via the airbag warning light in the instrument cluster. This tells you that something is wrong in the restraint system.

After an accident, the control unit stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 89170-48C00 fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed. Further causes are ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 removes it during the repair, so that the control unit works afterwards without these entries.

Electronic components age, and cold solder joints on the circuit board lose their secure connection over time. Moisture and corrosion at plug connections disturb the signal transmission.

Voltage spikes are also part of this, for example when the battery is weak or a jump start is connected.

How can you tell that the 89170-48C00 is defective?

The airbag warning light lights up permanently or intermittently. In addition, an error message appears in the instrument cluster, the diagnostic tool has no connection, or the fault memory cannot be cleared. In the event of a fault, airbags and seatbelt pretensioners may not trigger in an emergency.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Error message in the instrument cluster
• No connection between diagnostic tool and control unit
• Fault memory cannot be cleared

The display in the instrument cluster is the clearest signal the vehicle gives you. Do not leave it unanswered, because otherwise it remains unclear whether the restraint system is ready.

Which vehicles is the 89170-48C00 fitted in?

The 89170-48C00 is fitted in these vehicles: Lexus LX URJ200 (2008-2021).

The list serves as a guide and shows the vehicles that are assigned to this part number.

• Lexus LX URJ200 (2008-2021)

Compare the part number on the label of the removed unit with this page, so that you can be sure you have the right unit. Have the fault memory read out in addition. Only this log shows whether the control unit is defective or whether a plug or a cable is the cause.

How does the repair of the 89170-48C00 work?

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

This order is specified for your safety. That is why the battery is disconnected before removal.

Airbag24 tests the control unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes back to you. Processing at Airbag24 usually takes 3–4 working days, meaning testing, repairing and function testing.

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 89170-48C00 get to Airbag24?

You send the control unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Put the printed repair order into the parcel, and pack the control unit shock-proof so that it arrives undamaged.