Airbag control unit with part number 89170-48A30

What does the airbag control unit 89170-48A30 do?

The airbag control unit 89170-48A30 is the central control unit of the restraint system (SRS) for Lexus. It evaluates the crash sensors, determines in a crash, within milliseconds, which airbags and seatbelt pretensioners deploy, and monitors the system continuously.

It makes detected faults visible via the airbag warning light in the instrument cluster. After an accident it secures crash data, after which it is locked; only the repair lifts the lock.

Why does the control unit 89170-48A30 fail?

The most common cause is crash data from an accident, even if no airbag has deployed. Besides the crash data, these causes are possible:

• electronic components that age over the course of use
• cold solder joints
• moisture and corrosion at the connectors
• voltage spikes, for example from a weak battery or a jump start

Crash data cannot be removed with a normal diagnostic tool. Airbag24 deletes it during the repair.

How can you tell that the 89170-48A30 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, a fault message appears, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In that case, airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the most direct indication of the state of the restraint system that a vehicle provides.

A fault message that cannot be acknowledged, or a fault memory that does not empty, also points to a fault that persists.

Which vehicles is the 89170-48A30 fitted in?

The assignment is based on the data Airbag24 holds for this control unit. The control unit 89170-48A30 is fitted in these vehicles: Lexus RX AL20 (2015-2019).

You will find the recorded vehicles listed below.

• Lexus RX AL20 (2015-2019)

Comparing the part number on the label with this page makes sure that you have removed the correct unit. Whether the control unit is defective, or whether a connector or a cable is the cause, is only clarified by the fault memory. So have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 89170-0E021, 89170-48210, 89170-48211, 891700000000000016768827392, 89170000000000005112856576.

How does the repair of the 89170-48A30 work?

First have the fault memory read out and enclose the readout log. Then disconnect the battery, remove the control unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

The readout log belongs with the unit, and the sequence is prescribed for safety reasons: disconnect the battery first, then remove the control unit.

Airbag24 examines the unit on the test bench, replaces defective components, deletes the stored crash data and runs 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 89170-48A30 get to Airbag24?

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

The printed repair order goes into the parcel. Pack the unit shockproof, so that it arrives safely.