Airbag control unit with part number 89170-04280

What does the airbag control unit 89170-04280 do?

The control unit 89170-04280 is the central control unit of the restraint system (SRS) for vehicles of the make Toyota. It evaluates the signals from the crash sensors and decides within milliseconds which airbags and seatbelt pretensioners to trigger. After an accident, it stores crash data and locks itself.

The unit also monitors the entire system continuously, even when nothing seems amiss in everyday driving. If it detects a fault, it reports it via the airbag warning light in the instrument cluster. That way the driver and the workshop know that the system needs checking.

Why does the control unit 89170-04280 fail?

With the 89170-04280, the most common cause after an accident is stored crash data, even if no airbag has deployed. Ageing components, cold solder joints, moisture and voltage spikes are also possible.

Crash data cannot be deleted with a standard diagnostic tool. During the repair, Airbag24 deletes it, so the unit works again without this legacy issue afterwards.

Further causes in detail:

• ageing electronic components
• cold solder joints
• moisture and corrosion at plug connectors
• voltage spikes, for example from a weak battery or jump-starting

How can you tell that the 89170-04280 is defective?

A defect in the 89170-04280 shows up as the airbag warning light in the instrument cluster staying on permanently or intermittently. In addition, there may be a fault message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

• Airbag warning light on permanently or intermittently
• Fault message in the instrument cluster
• The diagnostic tool gets no connection to the control unit
• The fault memory cannot be cleared

If one of these signs is present, airbags and seatbelt pretensioners may possibly fail to deploy in an emergency. So have the system checked promptly, even if driving has been normal so far.

Which vehicles is the 89170-04280 fitted in?

The control unit 89170-04280 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The breakdown by model looks like this:

• Toyota Tacoma N200 (2004-2015)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit. Have the fault memory read out beforehand. Only this result shows whether the control unit is defective or whether a plug or cable is causing the fault.

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 89170-04280 work?

First have the fault memory of the 89170-04280 read out and enclose the log, then disconnect the battery and only then remove the control unit. Then create a repair order online and send the unit in, well packed. Processing at Airbag24 takes 3–4 working days as a rule.

Airbag24 checks the unit on the test bench, replaces defective components and deletes stored crash data. A functional test completes the work; 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 89170-04280 get to Airbag24?

You send the 89170-04280 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back by UPS.

Enclose the printed repair order in the parcel, and pack the unit shock-proof.