Airbag control unit with part number 89170-F4370

What does the airbag control unit 89170-F4370 do?

The airbag control unit 89170-F4370 coordinates the restraint system (SRS) in Toyota. It evaluates the crash sensors and, in an accident, selects within milliseconds the airbags and seatbelt pretensioners that are to fire. It shows faults via the airbag warning light.

The system is monitored continuously during operation. Each detected fault is stored in the fault memory and can be retrieved with a diagnostic tool.

After an accident, it stores crash data and locks itself.

Why does the control unit 89170-F4370 fail?

The most common cause is crash data that remains stored after an accident, even without a deployed airbag. Other causes are added in brief:

Crash data cannot be removed with a standard diagnostic tool. Airbag24 erases it during the repair.

The other triggers mainly concern the electronics and their connections:

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

How can you tell that the 89170-F4370 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears in the instrument cluster. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to deploy in an emergency.

The warning light is the first sign you will notice, and it reports the fault by itself. Take it seriously.

Whether the control unit is actually defective, or whether a connector or cable is the cause, is shown only by the fault memory, which you should have read out beforehand.

Which vehicles is the 89170-F4370 fitted in?

Check your vehicle against the list. The control unit 89170-F4370 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The vehicles that belong to this part number are compiled here:

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

The part number on the label of the removed unit can be compared with this page. That only confirms that it is the correct unit. Please also have the fault memory read out in advance, because only that shows whether the control unit is defective or whether a connector 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-F4370 work?

For the control unit 89170-F4370, have the fault memory read out before removal and enclose the report, then disconnect the battery. Processing at Airbag24 usually takes 3–4 working days.

Then remove the control unit, create the repair order online and send in the well-packed unit. At Airbag24, the unit is examined on the test bench, defective components are repaired, crash data is erased and a function test is carried out. Afterwards, your own unit is returned 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-F4370 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the control unit 89170-F4370 back to you by UPS.

Put the printed repair order in the parcel and pack the control unit shock-resistant.