Airbag control unit with part number 89170-F4320

What does the airbag control unit 89170-F4320 do?

The airbag control unit 89170-F4320 coordinates the restraint system (SRS) of Toyota. It evaluates the crash sensors and decides in a crash, within milliseconds, which airbags and seatbelt pretensioners are triggered.

While driving it monitors the system constantly and reports faults via the airbag warning light.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-F4320 fail?

The most common cause of a failure of the 89170-F4320 is stored crash data, even when no airbag has been triggered. Other causes include aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes.

Crash data remains stored even if an airbag has never been triggered. A normal diagnostic tool cannot erase it; Airbag24 takes care of this during the repair.

Aged components and cold solder joints count among the other causes. Moisture and corrosion on plug connectors additionally disturb the contact.

Voltage spikes, for example from a weak battery or jump-starting, can also strain the unit.

How can you tell that the 89170-F4320 is defective?

The airbag warning light in the instrument cluster shows a defect on the 89170-F4320 by lighting up permanently or intermittently. In addition there is a fault message, no connection between the diagnostic tool and the control unit, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then not trigger. Take the light seriously and have what lies behind it checked promptly.

Which vehicles is the 89170-F4320 fitted in?

The control unit 89170-F4320 is fitted in these models: Toyota C-HR NGX10 Facelift (2019-2023).

The overview lists the models that belong to this part number:

• Toyota C-HR NGX10 Facelift (2019-2023)

Compare the part number on the label of the removed unit with this page. This only confirms that you have the correct unit. Only a fault memory read out beforehand 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-F4210, 8917010110.

How does the repair of the 89170-F4320 work?

Before removal, have the fault memory read out and attach the log. Then disconnect the battery and only then remove the 89170-F4320. Processing at Airbag24 usually takes 3–4 working days.

Then create a repair order online and send the unit in well packed. Airbag24 checks it on the test bench, replaces defective components, erases stored crash data and carries out a function test. After that the unit comes 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-F4320 get to Airbag24?

You send the control unit 89170-F4320 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 unit shock-proof.