Airbag control unit with part number 89170-04340

What does the airbag control unit 89170-04340 do?

For Toyota, the 89170-04340 controls the restraint system as an airbag control unit. In an accident it decides within milliseconds which airbags and seatbelt pretensioners fire, and it checks the system continuously.

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

After an accident the unit stores crash data and then locks itself.

Why does the control unit 89170-04340 fail?

Stored crash data is the most frequent trigger of a failure in the 89170-04340, even without an airbag having fired. An ordinary diagnostic tool cannot empty this memory. Other possible causes are aged components, cold solder joints, moisture and corrosion at contacts, and voltage spikes, for example from a weak battery or jump-starting.

Externally, it is not possible to tell from the unit whether crash data is stored.

The other causes develop over a longer period and only appear once contacts or components weaken.

How can you tell that the 89170-04340 is defective?

The airbag warning light in the instrument cluster stays on permanently or flickers from time to time. A fault message and a diagnostic tool without a connection are added to this at the 89170-04340, along with a fault memory that cannot be cleared. Airbags and seatbelt pretensioners may then fail to fire in an emergency.

The warning light shows the fault even when the vehicle drives completely normally in everyday use.

Even a diagnostic tool without a connection to the control unit is a clear reason to have the system checked.

Which vehicles is the 89170-04340 fitted in?

The 89170-04340 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The list of vehicles for this part number follows here.

• Toyota Tacoma N200 (2004-2015)

Compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Whether the control unit itself is defective or a plug or cable is behind it is shown only by the fault memory, which you should have read out 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 89170-04340 work?

Start with reading out the fault memory of the 89170-04340 and attach the log. Only then disconnect the battery and remove the control unit. Next, create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, replaces defective components, erases the crash data and runs a function test. Processing there usually takes 3–4 working days.

The sequence serves the safety of the restraint system.

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 89170-04340 get to Airbag24?

The 89170-04340 reaches Airbag24 as a parcel or via a UPS collection that you book for an extra charge. Airbag24 returns the repaired unit by UPS.

The printed repair order goes into the parcel; the unit must also be packed to withstand shocks.