Airbag control unit with part number 89170-76700

What does the airbag control unit 89170-76700 do?

The airbag control unit 89170-76700 coordinates the restraint system (SRS) of Lexus: it reads the crash sensors, decides on triggering the airbags and seatbelt pretensioners within milliseconds of an impact, and checks the system continuously during operation. If it detects a fault, it reports this via the airbag warning light. After an accident, it stores crash data and locks itself.

The control works in the background, without you noticing anything. Only a fault makes it visible, because then it switches on the warning light.

Why does the control unit 89170-76700 fail?

For the 89170-76700, the most common cause is crash data stored after an accident, even if no airbag has deployed. A common diagnostic tool does not erase this data. Aged components, cold solder joints, moisture on plug connections and voltage spikes are further causes.

Crash data is the first point to check in every fault search, because it cannot be removed with on-board means. Airbag24 removes it during the repair.

The other causes are a matter of ageing and environmental influences. Electronic components age, solder joints can stay cold, and corrosion attacks the contacts. Voltage spikes, for example with a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the 89170-76700 is defective?

A defect in the 89170-76700 shows through the airbag warning light in the instrument cluster, which stays on permanently or intermittently, through a fault message on the display, through a missing connection to the diagnostic tool, or through a fault memory that cannot be emptied. In an emergency, the airbags and seatbelt pretensioners may then fail to deploy.

The airbag warning light in the instrument cluster is the first thing you notice. It lights up as soon as the system detects a deviation, and this warning must be taken seriously.

A message in the instrument cluster is therefore not a trivial matter but a signal you should take seriously.

Which vehicles is the 89170-76700 fitted in?

The airbag control unit 89170-76700 is used by Lexus in the following vehicles. It is fitted in these vehicles: Lexus UX MZAA10 (from 2018).

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

• Lexus UX MZAA10 (from 2018)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Also have the fault memory read out in advance. Only this result shows whether the control unit is defective or a connector or cable is the cause.

How does the repair of the 89170-76700 work?

First, the fault memory of the 89170-76700 is read out, and you attach the log to the unit. Then disconnect the battery and remove the control unit. Next, create a repair order online and send in the unit well packed. Processing at Airbag24 usually takes 3–4 working days.

This sequence is mandatory for safety reasons. Removal only happens once the fault memory has been secured.

At Airbag24, the unit is checked, defective components are replaced, stored crash data is erased and a functional test is carried out. The repaired unit then returns 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 89170-76700 get to Airbag24?

You send the control unit 89170-76700 as a parcel or book a UPS collection for an extra charge. Airbag24 sends it back via UPS after the repair.

Place the printed repair order at the top of the parcel and pack the unit shock-proof so that it survives transport well.