Airbag control unit with part number 89170-76100

What does the airbag control unit 89170-76100 do?

The airbag control unit 89170-76100 controls the restraint system (SRS) of Lexus. It evaluates the signals from the crash sensors, decides in a fraction of a second in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system constantly.

If it detects a fault, it reports it via the airbag warning light in the instrument cluster. This light is the first indication that something is wrong in the restraint system.

After an accident the control unit also stores crash data and then locks itself.

Why does the control unit 89170-76100 fail?

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

Crash data cannot be erased with a normal diagnostic tool. Airbag24 removes it during the repair.

The other causes lie in the electronics themselves or in their connections. Components age, solder joints can go cold, and moisture or corrosion at the plugs disturbs signal transmission. Voltage spikes, for example from a weak battery or when starting with a jump start, additionally stress the unit.

How can you tell that the 89170-76100 is defective?

A defect in the 89170-76100 shows itself through an airbag warning light that lights up permanently or intermittently, through an error message in the instrument cluster, or because a diagnostic tool cannot establish a connection to the control unit. A fault memory that cannot be cleared also belongs to these signs.

If the light is on, airbags and seatbelt pretensioners may not fire in an emergency. For this reason, do not ignore this indication.

If the light goes out again after some time, this does not necessarily mean that the fault has been rectified.

Which vehicles is the 89170-76100 fitted in?

The control unit 89170-76100 is fitted in these vehicles: Lexus CT ZWA10 (2011-2022).

The list shows the models in which this unit has been installed.

• Lexus CT ZWA10 (2011-2022)

On the one hand, compare the part number on the label of the removed unit with this page. This only ensures that you have the correct unit in front of you. On the other hand, have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-02C30, 89170-76160, 89170-76210, 89170-76220.

How does the repair of the 89170-76100 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit 89170-76100. Then create a repair order online and send the unit well packed.

Airbag24 checks the unit on the test bench, repairs defective components, deletes the stored crash data and carries out a function test. After that the unit goes back to you.

Processing at Airbag24 takes 3–4 working days as a rule. This period concerns only the 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 89170-76100 get to Airbag24?

You send the control unit 89170-76100 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

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