Airbag control unit with part number 89170-04271

What does the airbag control unit 89170-04271 do?

The airbag control unit 89170-04271 is the control centre of the restraint system (SRS) for Toyota. It processes the crash sensor data, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the system continuously. Faults are shown via the airbag warning light.

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

The sensors provide the basis for every evaluation, and the unit works without any action on your part.

Why does the control unit 89170-04271 fail?

Most often the cause is stored crash data, even if no airbag has deployed. These cannot be erased with a normal diagnostic tool. Other causes are aging electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data is the most common cause because the unit stores it even when the airbag does not fire. Airbag24 erases it as part of the repair.

The other causes only show up during an inspection of the unit.

Voltage spikes arise, for example, from a weak battery or from jump-starting.

How can you tell that the 89170-04271 is defective?

A defect shows itself through the airbag warning light in the instrument cluster, through a fault message there, and through a missing connection of the diagnostic tool. The fault memory also cannot be cleared.

• Airbag warning light lights up constantly or at times
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

Airbags and seatbelt pretensioners may then not deploy in an emergency. A prompt check of the system is therefore sensible.

Which vehicles is the 89170-04271 fitted in?

The control unit 89170-04271 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The following assignment shows the vehicles in which this part number is fitted.

• Toyota Tacoma N200 (2004-2015)

First compare the part number on the label of the unit with this page. This only confirms that it is the right unit. In addition, have the fault memory read out beforehand, because only this log shows whether the control unit itself 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 89170-04271 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the control unit 89170-04271. Processing at Airbag24 usually takes 3–4 working days.

Create the repair order online, then send the unit off well packed. Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test.

After that 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 89170-04271 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 sends the unit back by UPS.

Pack the printed repair order into the parcel and pad the unit shockproof.