Airbag control unit with part number 89170-F4660

What does the airbag control unit 89170-F4660 do?

The airbag control unit 89170-F4660 controls the restraint system (SRS) of Toyota. It evaluates the crash sensors, determines within milliseconds in the event of an accident which airbags and seatbelt pretensioners are triggered, and monitors the system permanently.

The unit reports faults in the system via the airbag warning light in the instrument cluster, so that you notice a malfunction in everyday driving.

After an accident it stores crash data and locks itself. This lock only ends with the repair.

Why does the control unit 89170-F4660 fail?

The most common cause is stored crash data that remains in the unit after an accident, even if no airbag has deployed. A normal diagnostic tool cannot delete it. Other causes are aged components, cold solder joints, moisture on plug connectors and voltage spikes.

Crash data is the consequence of a registered impact. As long as it sits in the memory, the unit cannot reset the fault condition, and a diagnostic tool does not help here.

Aged components and solder joints that give way cause faults gradually. Moisture and corrosion attack the contacts and impair signal transmission.

Voltage spikes, on the other hand, occur instantly, for example with a weak battery or when jump-starting.

How can you tell that the 89170-F4660 is defective?

The airbag warning light in the instrument cluster, which lights up permanently or intermittently, is the most important sign. In addition, an error message may appear in the instrument cluster, the diagnostic tool may fail to establish a connection to the control unit, or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not deploy.

The warning light shows the defect before it makes itself felt in any other way. If it lights up, have the system checked promptly rather than waiting for a further symptom.

If the light is off but a diagnostic tool has no connection, the cause remains open, and a check will provide clarity.

Which vehicles is the 89170-F4660 fitted in?

The control unit 89170-F4660 is fitted in these vehicles: Toyota C-HR NGX10 Facelift (2019-2023).

The vehicles we have on record for this part number are listed here.

• 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 it is the correct unit. Also have the fault memory read out beforehand, because only this result 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-F4660 work?

You first read out the fault memory and enclose the log. Then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Airbag24 checks it, replaces defective components, deletes the crash data and carries out a function test, after which your own unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This deadline applies only to checking, repairing and testing in-house.

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-F4660 get to Airbag24?

You send the unit 89170-F4660 in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

The printed repair order goes into the parcel. Pack the unit shockproof so that it arrives undamaged.