Airbag control unit with part number 89170-33840

What does the airbag control unit 89170-33840 do?

The airbag control unit 89170-33840 controls the restraint system in Lexus. It evaluates the signals from the crash sensors, decides within fractions of a second in an accident whether to trigger, and monitors the entire system continuously.

Detected faults are shown via the airbag warning light in the instrument cluster. This makes the light the central warning signal of the system.

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

Why does the control unit 89170-33840 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are:

Crash data cannot be erased with a standard diagnostic tool. Airbag24 erases it as part of the repair.

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

How can you tell that the 89170-33840 is defective?

A defect in the 89170-33840 shows up first as the airbag warning light in the instrument cluster, which stays on permanently or intermittently. An error message, a diagnostic tool without connection and a fault memory that cannot be cleared are added signs.

If the light is on, airbags and seatbelt pretensioners may not deploy in an emergency.

If the light goes out after a while, that is no proof that the fault has been fixed.

Which vehicles is the 89170-33840 fitted in?

The control unit 89170-33840 is fitted in these vehicles: Lexus ES ASV60 (2012-2015).

The list shows the models in which this unit was installed.

• Lexus ES ASV60 (2012-2015)

Compare the part number on the label of the removed unit with this page. That only confirms that you have the right unit. Before that, have the fault memory read out, because only the log 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 89170-06880, 89170-33860.

How does the repair of the 89170-33840 work?

Airbag24 checks the unit on the test bench, repairs defective components, erases the crash data and carries out a function test. Processing usually takes 3–4 working days.

Before sending, read out the fault memory and enclose the log. Then disconnect the battery and only after that remove the unit. Next, create a repair order online and pack the control unit well.

These 3–4 working days cover testing, repairing and checking at Airbag24 only.

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 89170-33840 get to Airbag24?

You send the control unit 89170-33840 to Airbag24 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

The printed repair order goes into the parcel, and the unit is packed in a shock-proof way.