Airbag control unit with part number 89170-F4600

What does the airbag control unit 89170-F4600 do?

The airbag control unit 89170-F4600 is the central control unit of the restraint system (SRS) in Toyota vehicles. It processes the crash sensor data and determines in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

During operation it checks the entire system. Faults are shown via the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-F4600 fail?

Stored crash data is the most common cause when the control unit 89170-F4600 fails, even when no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are ageing electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data remains in the unit after the accident and cannot be removed with the usual diagnostic tool. The other causes are mainly down to ageing: electronic components wear out, solder joints become brittle, and moisture or corrosion on connectors disrupts the contact.

Voltage spikes, for example from a weak battery or when jump-starting, can also harm the unit. Which cause applies is determined by the test.

How can you tell that the 89170-F4600 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently. In addition there is an error message in the instrument cluster, a diagnostic tool without a connection to the control unit, and a fault memory that cannot be cleared.

These signs can occur singly or together. If you notice one of them, you do not need to interpret it yourself; have it checked.

Airbags and seatbelt pretensioners may possibly fail to deploy if the defect is present. The warning light makes it visible, so you should act promptly.

Which vehicles is the 89170-F4600 fitted in?

The control unit 89170-F4600 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

These vehicles are assigned to the part number:

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

Match the part number on the label of the removed unit against this page, and you will know that it is the correct unit. Have the fault memory read out beforehand. Only the result shows whether the control unit is defective or whether a connector or a 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-F4600 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only afterwards remove the control unit 89170-F4600. Airbag24 processes the unit in usually 3–4 working days until testing, repairing and the test are complete.

Afterwards you create a repair order online and pack the unit well before sending it. Airbag24 checks it on the test bench, replaces defective components, deletes the stored crash data and carries out a function test. Your own 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-F4600 get to Airbag24?

You send the control unit 89170-F4600 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you via UPS.

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