Airbag control unit with part number 89170-07420

What does the airbag control unit 89170-07420 do?

The airbag control unit 89170-07420 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the system continuously. It reports faults via the airbag warning light.

After an accident, it stores crash data and locks itself.

Monitoring runs without interruption as long as the vehicle is switched on.

Why does the control unit 89170-07420 fail?

The most common cause is crash data stored after an accident, even if no airbag has triggered; a normal diagnostic tool cannot erase them. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Other causes at a glance:

• aged electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 89170-07420 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. In addition, the diagnostic tool gets no connection to the control unit, and the fault memory cannot be erased.

As long as these signs persist, airbags and seatbelt pretensioners may not trigger in an emergency. Such a finding must therefore be taken seriously.

The light indicates the fault as soon as the system detects it.

Which vehicles is the 89170-07420 fitted in?

The control unit 89170-07420 is fitted in these vehicles: Toyota Avalon XX50 Facelift (from 2022) and XX50 (2018-2022).

The vehicles for this part number are shown in the list below.

• Toyota Avalon XX50 Facelift (from 2022)
• Toyota Avalon XX50 (2018-2022)

Compare the part number on the label of the removed unit with this page to make sure it is the correct unit. Additionally, have the fault memory read out beforehand; only this finding shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 89170-07420 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and repairs defective components. Airbag24 then erases the stored crash data and carries out a function test. The unit then 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 89170-07420 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After repair, Airbag24 returns it to you by UPS.

Put the printed repair order in the parcel and pack the control unit shock-proof.