Airbag control unit with part number 89170-F4070

What does the airbag control unit 89170-F4070 do?

The airbag control unit 89170-F4070 is the central unit of the restraint system (SRS) for Toyota. In an accident, it decides within milliseconds which airbags and seatbelt pretensioners are triggered, and for this it evaluates the crash sensors.

At the same time, it checks the system continuously and reports faults via the airbag warning light.

After an accident, the unit secures crash data and locks itself.

Why does the control unit 89170-F4070 fail?

Stored crash data is the most common cause, even if no airbag has been triggered in the accident. A conventional diagnostic tool cannot remove it.

Aged electronic components, cold solder joints, and moisture and corrosion on connectors can also play a part. Voltage spikes, for example from a weak battery or a jump-start, additionally stress the electronics.

How can you tell that the 89170-F4070 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently when something is wrong. There may also be fault messages, a diagnostic tool without a connection, or a fault memory that cannot be cleared.

In this condition, airbags and seatbelt pretensioners may possibly not trigger in an emergency. A prompt check will provide clarity.

Which vehicles is the 89170-F4070 fitted in?

The 89170-F4070 is fitted in these vehicles: Toyota C-HR NGX10 (2017-2019).

This assignment is recorded for the part number:

• Toyota C-HR NGX10 (2017-2019)

Have the fault memory read out beforehand, so it is clear whether the control unit itself is affected or whether a connector or cable is the cause. Then it is worth comparing the part number on the removed unit with the one stated above.

For the same vehicles, we also repair control units with the part numbers 89170-F4210, 8917010110.

How does the repair of the 89170-F4070 work?

You read out the fault memory before removal and enclose the log. Then disconnect the battery, remove the control unit and create a repair order online. Afterwards, send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and runs a function test. Processing at Airbag24 usually takes 3–4 working days. Your own unit is then 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-F4070 get to Airbag24?

You send the control unit 89170-F4070 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it to you by UPS.

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