Airbag control unit with part number 89170-04500

What does the airbag control unit 89170-04500 do?

The airbag control unit 89170-04500 is the central control unit for airbags and seatbelt pretensioners in Toyota. It continuously checks the crash sensors and the entire system, and in a crash it decides within milliseconds whether to trigger.

If the unit detects a fault, it reports this via the airbag warning light in the instrument cluster.

After a crash, the control unit stores crash data and locks itself.

Why does the control unit 89170-04500 fail?

Most often this is due to crash data from an accident, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Aged components, moisture, cold solder joints and voltage spikes are also possible causes.

Crash data are therefore relevant not only when airbags deploy. Especially in a collision without deployment, they remain in the memory.

Aged electronics, moisture at connectors and cold solder joints also play a role, as do voltage spikes when starting with a weak battery or when jump-starting.

Which cause applies in each case is shown by reading out the fault memory.

How can you tell that the 89170-04500 is defective?

The airbag warning light in the instrument cluster stays on constantly or only intermittently. In an emergency, airbags and seatbelt pretensioners may then not trigger.

• Fault message in the instrument cluster
• Diagnostic tool gets no connection to the control unit
• Fault memory cannot be cleared

Each of these signs points to a problem that you should have checked promptly.

Whether the control unit itself or the wiring is affected remains open until diagnosis.

Which vehicles is the 89170-04500 fitted in?

The 89170-04500 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

These vehicles are assigned to this part number:

• Toyota Tacoma N200 (2004-2015)

Compare the part number on the label of the removed unit with this page; this only confirms that you have the right unit. Also have the fault memory read out before you remove anything, because only this result shows whether the control unit is defective or a connector or cable is the cause.

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 89170-04500 work?

Have the fault memory read out first and enclose the log with the parcel. Only then disconnect the battery and remove the control unit. Then create the repair order online and send the unit well packed. At Airbag24, testing, repair and functional test usually take 3–4 working days.

Airbag24 tests the unit on the test bench, replaces defective components, erases stored crash data and carries out a functional test. 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 89170-04500 get to Airbag24?

Either you send the control unit as a parcel, or you arrange a UPS collection for an extra charge. Airbag24 sends the repaired unit back via UPS.

The printed repair order and the unit go in the parcel, packed shock-resistant so that it arrives safely at Airbag24.