Airbag control unit with part number 89170-78050

What does the airbag control unit 89170-78050 do?

The airbag control unit 89170-78050 has the task in the vehicle of controlling the restraint system (SRS) of Lexus. It evaluates the crash sensors, determines in an accident within milliseconds which airbags and seatbelt pretensioners are triggered, and indicates faults via the airbag warning light.

Monitoring takes place constantly, even when the vehicle runs unobtrusively. Only a fault makes its work visible.

After an accident the unit stores crash data and locks itself. The consequences for diagnosis and repair are described in the remaining sections.

Why does the control unit 89170-78050 fail?

The most common cause for the 89170-78050 is crash data stored after an accident, even without a triggered airbag. A standard diagnostic tool cannot erase them. Further causes include ageing components and voltage spikes.

The further causes in overview:

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

Which of these applies must be shown by the readout of the fault memory.

How can you tell that the 89170-78050 is defective?

The airbag warning light in the instrument cluster indicates a defect in the 89170-78050 when it stays on permanently or lights up intermittently. In addition, a fault message in the instrument cluster, a missing connection to the diagnostic tool and a fault memory that cannot be cleared may occur. Then airbags and seatbelt pretensioners may not be able to deploy in an emergency.

The light is the visible warning signal of the system.

If you see any of these signs, have the fault memory read out as soon as possible. The log shows which entries the control unit has stored.

Which vehicles is the 89170-78050 fitted in?

The control unit 89170-78050 is fitted in these vehicles: Lexus NX AZ10 (2014-2017) and AZ10 Facelift (2017-2021). The information is based on our assignment of this part number.

The list shows the vehicles known to us for this part number.

• Lexus NX AZ10 (2014-2017)
• Lexus NX AZ10 Facelift (2017-2021)

Compare the part number on the label of the removed unit with this page, then you know it is the correct unit. Also have the fault memory read out beforehand, because 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 89170-78010.

How does the repair of the 89170-78050 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit 89170-78050 and send it in well packed after creating a repair order online. Checking, repairing and testing at Airbag24 takes 3–4 working days as a rule.

Airbag24 checks the unit on the test bench, replaces defective components and erases stored crash data. A function test is then carried out before your own unit is returned to you.

The sequence is mandatory for removal. 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 89170-78050 get to Airbag24?

You send the control unit 89170-78050 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Place the printed repair order in the parcel and pack the unit shockproof.