Airbag control unit with part number 89170-48630

What does the airbag control unit 89170-48630 do?

The airbag control unit 89170-48630 controls the restraint system (SRS) in Lexus and evaluates the signals from the crash sensors. In an emergency it decides which airbags and seatbelt pretensioners fire, and it monitors the system continuously. After an accident, it stores crash data and locks itself.

The control unit makes its decision in a split second because it receives the data directly from the sensors. If it detects a fault, it reports this via the airbag warning light.

Why does the control unit 89170-48630 fail?

The most common cause is stored crash data that remains in the unit after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Other reasons are aged components, cold solder joints, moisture and corrosion in plug connections, and voltage spikes.

The crash data stays in memory, regardless of whether an airbag has deployed.

Aged components and cold solder joints are typical damage patterns of older electronics. Moisture and corrosion attack plug connections, and voltage spikes occur, for example, with a weak battery or jump-starting.

How can you tell that the 89170-48630 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message also appears. If the diagnostic tool cannot establish a connection, or the fault memory cannot be cleared, a defect is likely. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

• Airbag warning light, permanent or intermittent
• Fault message in the instrument cluster
• missing connection to the control unit at the diagnostic tool
• fault memory that cannot be cleared

Signs like these justify a check, whether or not the light stays on continuously.

Which vehicles is the 89170-48630 fitted in?

The airbag control unit 89170-48630 is fitted in these vehicles: Lexus RX AL10 Facelift (2012-2015) and AL10 (2009-2012). The vehicle registration document shows whether your own car is among them.

These are the vehicles for this part number:

• Lexus RX AL10 Facelift (2012-2015)
• Lexus RX AL10 (2009-2012)

Comparing the part number on the label of the removed unit with this page only ensures that it is the correct unit. The cause is clarified only by the fault memory: have it read out before removal, and it will show whether the control unit itself is defective or whether a plug or cable causes the failure.

For the same vehicles, we also repair control units with the part numbers 1503001853, 8917048380.

How does the repair of the 89170-48630 work?

You have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Next, you create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, erases the stored crash data and carries out a function test. The unit then 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 89170-48630 get to Airbag24?

You send the control unit 89170-48630 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order goes into the parcel, and you pack the unit shock-proof.