Airbag control unit with part number 89170-04390

What does the airbag control unit 89170-04390 do?

The airbag control unit 89170-04390 controls the restraint system (SRS) in Toyota. It checks the signals from the crash sensors and decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered. After an accident it stores crash data and locks itself.

It monitors the system constantly; it shows every fault it finds via the airbag warning light in the instrument cluster.

If the control unit fails, the restraint system can no longer work reliably in an emergency.

Why does the control unit 89170-04390 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase it. Other causes are essentially wear on the electronics, corrosion and voltage spikes.

Other causes at a glance:

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

Which of these applies is determined by the examination at Airbag24.

How can you tell that the 89170-04390 is defective?

A defect shows first on the warning light in the instrument cluster, which lights up permanently or intermittently. The instrument cluster also displays an error message, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared.

The light indicates that the restraint system is not working properly.

In the event of such a defect, the airbags and seatbelt pretensioners may fail to deploy in an emergency. Please have the display checked promptly.

Which vehicles is the 89170-04390 fitted in?

The control unit 89170-04390 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The following overview lists the vehicles:

• Toyota Tacoma N200 (2004-2015)

Comparing the part number on the label of the removed unit with this page only ensures that it is the right unit, nothing more. The cause itself is established only by reading out the fault memory, which you should have done before removal.

For the same vehicles, we also repair control units with the part numbers 89170-04420, 89170-04570, 89170-04600, 89170-04650.

How does the repair of the 89170-04390 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. After that, create a repair order online and send the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 examines the unit on the test bench, repairs the defective components, removes stored crash data and carries out a function test. The return shipment of your own unit follows.

The 3–4 working days apply only to the work at Airbag24. 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 89170-04390 get to Airbag24?

The unit goes to Airbag24 as a parcel, or you book a UPS collection for an extra charge. Airbag24 handles the return shipment after the repair with UPS.

Place the printed repair order in the parcel and pack the unit shockproof.