Airbag control unit with part number 89170-48A10

What does the airbag control unit 89170-48A10 do?

The airbag control unit 89170-48A10 coordinates the restraint system (SRS) for Lexus as its central unit. It checks the crash sensors continuously and decides in a crash which airbags and seatbelt pretensioners are triggered.

The evaluation takes place within fractions of a second. The unit also monitors the entire system and reports faults via the airbag warning light.

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

Why does the control unit 89170-48A10 fail?

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

You cannot erase crash data with an ordinary diagnostic tool. Airbag24 takes care of this during the repair.

Further causes at a glance:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

The test in the unit shows which of these causes is actually present.

How can you tell that the 89170-48A10 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently if a fault is present. An error message in the instrument cluster, a diagnostic tool with no contact to the unit or a fault memory that cannot be cleared may also occur.

The warning light reports the fault as soon as the unit detects it, which makes it the first indication. Take it seriously and have the cause clarified.

The same applies to a diagnostic tool that makes no contact, and to a fault memory that cannot be cleared. Both point to a malfunction that you should have checked.

As long as the fault exists, airbags and seatbelt pretensioners may not trigger in an emergency.

Which vehicles is the 89170-48A10 fitted in?

The 89170-48A10 is fitted in these vehicles: Lexus RX AL20 (2015-2019).

The following overview shows the vehicles we have on record for this part number.

• Lexus RX AL20 (2015-2019)

Compare the part number on the label of the removed unit with this page, and you will know you have the right unit. However, have the fault memory read out first: only this result shows whether the control unit is defective or whether a plug or cable is the cause.

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 89170-48A10 work?

You first have the fault memory read out, then disconnect the battery and only afterwards remove the 89170-48A10.

Attach the log to the unit. Then create a repair order online and send the well-packed unit in.

At Airbag24 the unit is examined on the test bench. Airbag24 replaces defective components, erases the stored crash data, and a function test completes the work. Your own unit is then returned to you. The processing time of 3–4 working days stated above applies only to this work at Airbag24.

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 89170-48A10 get to Airbag24?

You send the control unit 89170-48A10 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends your own unit back by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof.