Airbag control unit with part number 89170-48C70

What does the airbag control unit 89170-48C70 do?

The airbag control unit 89170-48C70 controls the restraint system (SRS) in Lexus. The signals of the impact sensors are evaluated in it, and within milliseconds it decides which airbags and seatbelt pretensioners are triggered. It also monitors the system and shows faults via the airbag warning light.

The unit runs in the background and checks the system without you having to set anything.

In an accident, the unit stores crash data and locks itself.

Why does the control unit 89170-48C70 fail?

The most common cause is crash data that remains in the unit after an accident, even if no airbag has deployed. An ordinary diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes are also possible causes.

Airbag24 removes the crash data during the repair. Voltage spikes, for example from a weak battery or a jump-start, are a separate case that is examined specifically during testing.

Which cause is actually present only becomes clear from the examination on the test bench.

How can you tell that the 89170-48C70 is defective?

A defect shows through signs in the instrument cluster and on the diagnostic tool. In an emergency, airbags and seatbelt pretensioners may then not deploy.

These signs are:

• airbag warning light lights up permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool receives no connection to the control unit
• fault memory cannot be cleared

The warning light is a signal that you should keep an eye on during every journey.

Which vehicles is the 89170-48C70 fitted in?

The 89170-48C70 is fitted in these vehicles: Lexus LX URJ200 (2008-2021).

The vehicles to which this part number is assigned are listed below.

• Lexus LX URJ200 (2008-2021)

Comparing the part number on the label of the removed unit with this page only confirms that it is the matching unit. Having the fault memory read out shows, by contrast, whether the control unit is faulty or whether a plug or cable is the cause.

How does the repair of the 89170-48C70 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only afterwards remove the control unit. Next, create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test before the unit is sent back to you. Processing normally 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 89170-48C70 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. The return after the repair is made by UPS.

Enclose the printed repair order with the parcel and pack the unit shock-resistant.