Airbag control unit with part number 89170-33E20

What does the airbag control unit 89170-33E20 do?

The airbag control unit 89170-33E20 is the central control unit of the restraint system (SRS) for Lexus. It processes the signals from the crash sensors, determines in an accident which airbags and seatbelt pretensioners are to be triggered, and monitors the system continuously.

It stores faults and shows them via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself. Every investigation therefore begins with reading out the fault memory.

Why does the control unit 89170-33E20 fail?

The unit most often fails because of crash data stored after an accident, even if no airbag has deployed. It cannot be cleared with a normal diagnostic tool. Aged components, cold solder joints, moisture and voltage spikes also come into consideration.

Aged components and cold solder joints lose reliability over time. The connection also suffers when moisture or corrosion reaches the plug connectors.

Voltage spikes arise, for example, from a weak battery or when a jump start is connected. Such spikes stress the electronics.

How can you tell that the 89170-33E20 is defective?

A defect at the 89170-33E20 shows up as the airbag warning light, which stays on permanently or intermittently. Fault messages in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared come on top of that.

In such a state airbags and seatbelt pretensioners may not deploy in a crash. The warning light is therefore a sign you should take seriously and have checked.

Which vehicles is the 89170-33E20 fitted in?

The 89170-33E20 is fitted in these vehicles: Lexus ES AXZH60 (from 2018).

The following vehicles are on record for this part number:

• Lexus ES AXZH60 (from 2018)

Comparing the number on the label of the removed unit with this page ensures that you have the right unit. Have the fault memory read out beforehand. Only its contents show whether the control unit is defective or whether a plug or cable is affected.

For the same vehicles, we also repair control units with the part numbers 89170-06820, 89170-06850, 89170-06880, 89170-33B90, 89170-33C30, 89170-33C50.

How does the repair of the 89170-33E20 work?

At Airbag24 processing usually takes 3–4 working days. First have the fault memory read out and attach the log, then disconnect the battery before removing the control unit.

Then create a repair order online and send the unit in well packed. At Airbag24 it is checked on the test bench, defective components are replaced, stored crash data is cleared and a function test is finally run.

Your own unit is then returned 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 89170-33E20 get to Airbag24?

Your control unit 89170-33E20 arrives at Airbag24 as a parcel. You can send it yourself or book a UPS collection for an extra charge, and after repair Airbag24 returns it to you by UPS.

Put the printed repair order into the parcel and pack the unit shock-proof.