Airbag control unit with part number 89170-F4720

What does the airbag control unit 89170-F4720 do?

The airbag control unit 89170-F4720 forms the central control unit of the restraint system (SRS) in Toyota vehicles. It evaluates the crash sensors, selects the appropriate airbags and seatbelt pretensioners within milliseconds in a crash, and monitors the system continuously.

A detected fault appears via the airbag warning light in the instrument cluster.

After a crash, the control unit stores crash data and locks itself.

Why does the control unit 89170-F4720 fail?

The most common cause in the 89170-F4720 is crash data stored after a crash, even if no airbag was triggered. It cannot be removed with an ordinary diagnostic tool.

Other causes can act over a longer period: components age, solder joints may go cold, and moisture or corrosion attack plug connections.

Voltage spikes, for example from a weak battery or a jump start, place additional strain on the electronics.

How can you tell that the 89170-F4720 is defective?

A defect in the 89170-F4720 shows mainly through the airbag warning light in the instrument cluster. Fault messages and problems during diagnosis, which you notice on the car itself, are also added.

Watch for these signs:

• The airbag warning light stays on constantly.
• It lights up only intermittently.
• A fault message appears in the instrument cluster.
• A diagnostic tool cannot establish a connection to the control unit.
• The fault memory cannot be erased.

If such signs occur, the fault should be checked promptly. While it persists, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency.

Which vehicles is the 89170-F4720 fitted in?

First check whether your model is on the list. The airbag control unit 89170-F4720 is fitted in these vehicles: Toyota C-HR NGX50 (from 2024).

You will find the matching vehicles in this overview:

• Toyota C-HR NGX50 (from 2024)

You should have the fault memory read out before removal. That shows whether the control unit is actually defective or whether a plug or cable is causing the problem. Then compare the part number on the label with this page.

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

How does the repair of the 89170-F4720 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, remove the 89170-F4720, create the repair order online and send the unit in well packed. Airbag24 processes it upon receipt; testing, repairing and checking are generally planned for 3–4 working days.

At Airbag24 the unit is examined on the test bench. Defective components are replaced, stored crash data is erased and a function test is carried out.

You receive your own unit back afterwards. 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-F4720 get to Airbag24?

You send the control unit 89170-F4720 to Airbag24 as a parcel or book a UPS collection for an extra charge. UPS handles the return after repair.

The printed repair order goes in the parcel. The unit should be packed shockproof before it is sent.