Airbag control unit with part number 89170-76200

What does the airbag control unit 89170-76200 do?

The 89170-76200 is the central control unit of the restraint system (SRS) for Lexus. It processes the signals from the crash sensors, decides in a crash within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

If the unit detects a fault, it displays this via the airbag warning light in the instrument cluster. The fault information is also stored in the memory.

After an accident the control unit stores crash data and locks itself. This state is the starting point of every diagnosis, because it determines how the further check must proceed.

Why does the control unit 89170-76200 fail?

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

Crash data remains stored after an accident, even if no airbag fired. It cannot be removed with ordinary means. Airbag24 erases it during the repair.

Aged electronics are a cause that builds up over the years. Cold solder joints arise from strain that is hardly noticed in daily use.

Moisture and corrosion at plug connections disturb the contact, and voltage spikes, for example from a weak battery or a jump-start, put strain on the components.

How can you tell that the 89170-76200 is defective?

The airbag warning light in the instrument cluster lights up continuously or intermittently, a fault message appears in the instrument cluster, the diagnostic tool finds no connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light is the most important sign you notice in the vehicle. It shows the fault as soon as the unit detects it and calls for action.

A missing connection to the diagnostic tool or a fault memory that cannot be emptied confirm the suspicion. The exact cause is only clarified by the read-out.

Which vehicles is the 89170-76200 fitted in?

The 89170-76200 is fitted in these vehicles: Lexus CT ZWA10 (2011-2022).

The following list shows the vehicles recorded for this part number.

• Lexus CT ZWA10 (2011-2022)

The following steps will help you. Compare the part number on the label of the removed unit with this page; this ensures that it is the correct unit. Also have the fault memory read out beforehand, because only that 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 89170-76200 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the 89170-76200. Then create the repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

The first steps take place on the vehicle: reading out, the log, disconnecting the battery and removal, in this order. Only then does the work at Airbag24 begin.

There the unit is checked on the test bench, defective components are replaced, and a functional test completes the repair. Afterwards your own unit is 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 89170-76200 get to Airbag24?

You send the 89170-76200 in 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-proof.