Airbag control unit with part number 89170-0E320

What does the airbag control unit 89170-0E320 do?

The airbag control unit 89170-0E320 coordinates the restraint system (SRS) in the Toyota. It analyses the signals from the crash sensors, determines within milliseconds in a crash which airbags and seatbelt pretensioners fire, and checks the entire system continuously. After an accident it stores crash data and locks itself.

Conspicuous findings are stored in the fault memory and shown by the airbag warning light in the instrument cluster. The unit therefore also monitors wiring and power supply, even if you notice nothing.

The lock after an accident cannot be felt while driving. It only becomes noticeable during a diagnostic attempt.

Why does the control unit 89170-0E320 fail?

The most common cause is stored crash data left in the memory after an accident, even if no airbag has deployed; a normal diagnostic tool does not erase it. Other causes include aged components, cold solder joints, moisture and corrosion on connectors, and voltage spikes.

Crash data is the record of an accident, regardless of whether seatbelt pretensioners or airbags have fired. Other causes at a glance:

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

How can you tell that the 89170-0E320 is defective?

Typical signs are the airbag warning light in the instrument cluster staying on permanently or intermittently, a fault message in the instrument cluster, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

The signs appear individually or together:

• airbag warning light on permanently or intermittently
• fault message in the instrument cluster
• diagnostic tool without connection to the control unit
• fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not deploy once any of these points applies. Please have the system checked promptly.

Which vehicles is the 89170-0E320 fitted in?

The control unit 89170-0E320 is fitted in these vehicles: Toyota Highlander XU70 (from 2019). The details refer to the part number and can be checked against the label.

The vehicles are listed here:

• Toyota Highlander XU70 (from 2019)

First compare the number on the label of the removed unit with this page. That tells you that it is the right unit; the comparison says nothing more. Before that, have the fault memory read out. This log shows whether the control unit is defective or whether connectors or cables are the cause.

For the same vehicles, we also repair control units with the part numbers 89170-0E690.

How does the repair of the 89170-0E320 work?

First have the fault memory read out and attach the log. Then disconnect the battery and remove the control unit. Next, create a repair order online. At Airbag24 processing usually takes 3–4 working days.

Your steps on the vehicle begin with reading out the fault memory, whose log you attach. Only then disconnect the battery and remove the control unit. Finally, create the repair order online and pack the unit well before sending it.

At Airbag24 the unit is checked on the test bench, defective components are replaced and stored crash data is erased. A function test completes the work, then your own unit is returned.

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 89170-0E320 get to Airbag24?

Your route to us is by parcel or by a UPS collection booked for an extra charge. The return is made by UPS.

Put the printed repair order into the parcel. Pack the unit shock-proof.