Airbag control unit with part number 89170-F4080

What does the airbag control unit 89170-F4080 do?

The airbag control unit 89170-F4080 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals of the crash sensors and, in an accident, decides within milliseconds which airbags and seatbelt pretensioners are triggered.

It also monitors the system continuously. If it detects a fault, it reports this via the airbag warning light in the instrument cluster.

After an accident the control unit stores crash data and then locks itself.

Why does the control unit 89170-F4080 fail?

With the 89170-F4080, the most common cause is crash data stored after an accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connectors, as well as voltage spikes, for example from a weak battery or jump-starting.

Crash data cannot be erased with a normal diagnostic tool. Airbag24 erases it during the repair.

Aged components and cold solder joints can disrupt the electronics, even without a prior accident.

Moisture and corrosion disturb the contact at plug connectors. Voltage spikes load the electronics, and only a test shows the exact cause.

How can you tell that the 89170-F4080 is defective?

A defect on the 89170-F4080 shows itself through an airbag warning light that stays on permanently or intermittently, through a fault message in the instrument cluster, through a missing connection between the diagnostic tool and the control unit, and through a fault memory that cannot be cleared.

Then airbags and seatbelt pretensioners may not trigger in an emergency.

These signs are a clear reason to have the fault memory read out promptly.

Which vehicles is the 89170-F4080 fitted in?

The airbag control unit 89170-F4080 is installed in these vehicles: Toyota C-HR NGX10 (2017-2019).

The vehicles recorded for this part number are shown in the following overview.

• Toyota C-HR NGX10 (2017-2019)

Compare the part number on the label of the removed unit with this page. That only confirms it is the right unit. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory reading, which you have carried out beforehand.

For the same vehicles, we also repair control units with the part numbers 89170-F4210, 8917010110.

How does the repair of the 89170-F4080 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit 89170-F4080. Then create the repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a functional test. Afterwards you receive your own unit back.

Processing at Airbag24 usually takes 3–4 working days. This period covers only checking, repairing and testing.

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-F4080 get to Airbag24?

You send the control unit 89170-F4080 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.