Airbag control unit with part number 89170-76010

What does the airbag control unit 89170-76010 do?

The airbag control unit 89170-76010 is the central control unit of the SRS for Lexus. It evaluates the crash sensors, decides in an accident which airbags and seatbelt pretensioners fire, and monitors the restraint system continuously.

The unit checks itself during operation. If it detects a deviation, it stores the entry and reports it via the airbag warning light in the instrument cluster.

After an accident it stores crash data and locks itself. How this comes about and how you recognise the problem are explained in the following sections.

Why does the control unit 89170-76010 fail?

The most common reason is crash data stored after an accident, even if no airbag was triggered. A normal diagnostic tool cannot remove it.

This data remains in the unit and prevents the system from resetting itself easily. Many owners first suspect a cable break, although the cause lies in the control unit itself.

Further causes are aged electronic components, solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or from connecting jump leads. These factors can act together.

How can you tell that the 89170-76010 is defective?

A defect shows itself through the airbag warning light, which stays on permanently or intermittently, through an error message in the instrument cluster, or through a diagnostic tool without a connection to the control unit. A fault memory that cannot be cleared is a further indication.

The airbag warning light can catch the eye first. Whether it stays on permanently or only flickers now and then matters for the assessment, because in both cases the system is not working properly. An error message in the instrument cluster can confirm this.

That airbags and seatbelt pretensioners may fail to trigger in an emergency is the most important reason to have a fault checked promptly.

Which vehicles is the 89170-76010 fitted in?

The control unit 89170-76010 is fitted in these vehicles: Lexus CT ZWA10 (2011-2022).

The overview shows the vehicles for which this part number is known.

• Lexus CT ZWA10 (2011-2022)

Before removal, have the fault memory read out. That clarifies whether the control unit itself is affected or whether a plug or cable is involved. Then compare the part number on the label with the information here.

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 89170-76010 work?

You read out the fault memory, attach the log, disconnect the battery, remove the control unit, create the repair order online and then pack the unit. Afterwards send it in.

At Airbag24 the unit is checked on the test bench, defective components are replaced and the stored crash data is deleted. Processing usually takes 3–4 working days; a function test follows afterwards.

Afterwards your own unit 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 89170-76010 get to Airbag24?

You send the control unit 89170-76010 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 control unit shockproof.