Airbag control unit with part number 89170-F4110

What does the airbag control unit 89170-F4110 do?

The airbag control unit 89170-F4110 forms the switching point of the SRS restraint system of Toyota. It reads the sensor signals, calculates within fractions of a second in a collision which airbags and seatbelt pretensioners deploy, and checks the entire system at the same time. It indicates faults via the airbag warning light. After an accident, it stores crash data and locks itself.

You notice nothing of this in everyday life, because the unit runs quietly in the background.

A repair is the only way to lift the lock again.

Why does the control unit 89170-F4110 fail?

The main cause in the control unit 89170-F4110 is stored crash data, even if no airbag has deployed. An ordinary diagnostic tool cannot erase it. Further causes come from electronics and connections.

The entries remain in the memory until they are removed during a repair.

• ageing of the electronic components in the unit
• weak solder joints
• moisture and corrosion at plugs
• voltage fluctuations, for example from a weak battery or an external jump start

How can you tell that the 89170-F4110 is defective?

The airbag warning light in the instrument cluster lights up constantly or intermittently as soon as the system detects a fault. An additional fault message may appear; the diagnostic tool does not find the control unit 89170-F4110, and the fault memory remains.

While this indicator is lit, airbags and seatbelt pretensioners may fail to trigger in an emergency.

The defect therefore does not stay hidden but is displayed. Have the fault memory read out promptly.

Which vehicles is the 89170-F4110 fitted in?

The control unit 89170-F4110 is fitted in these vehicles: Toyota C-HR NGX10 (2017-2019).

Below you will find the vehicles stored for this part number.

• Toyota C-HR NGX10 (2017-2019)

A comparison of the part number on the label of the removed unit with this page only confirms the identity of the unit. Reading out the fault memory shows whether the control unit itself is affected or whether a plug 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-F4110 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit 89170-F4110. Next, create a repair order online and pack the unit well before sending it in.

Airbag24 checks the unit on the test bench, repairs defective components, removes the stored crash data and carries out a function test. Afterwards the unit goes back to you.

Processing usually takes 3–4 working days at Airbag24. This time applies only to 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-F4110 get to Airbag24?

Shipping is by parcel; alternatively, you can have the control unit 89170-F4110 collected by UPS for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

The printed repair order belongs in the parcel, and the unit must be packed shockproof.