Airbag control unit with part number 89170-04210

What does the airbag control unit 89170-04210 do?

The airbag control unit 89170-04210 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the crash sensors, decides in a crash within milliseconds about the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After a crash it stores crash data and locks itself.

During driving the unit checks the sensors, the wiring and the connection to the triggers. If it detects a fault, it displays this via the airbag warning light in the instrument cluster.

The lock after a crash is part of the system logic. For this, the control unit works together with the other components of the restraint system.

Why does the control unit 89170-04210 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool cannot remove them. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Stored crash data remain until they are erased. Airbag24 erases them during the repair, so the unit comes back without them.

The other causes arise over time or through influences in the vehicle electrical system. Electronic components age, solder joints can go cold, moisture and corrosion attack plug connections, and voltage spikes stress the electronics.

How can you tell that the 89170-04210 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool cannot connect to the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may fail to deploy.

Watch the warning light and the messages on the display after switching on the ignition. They point directly to the defect.

If the connection to the diagnostic tool fails, a closer check is needed before a cause is named.

Which vehicles is the 89170-04210 fitted in?

The airbag control unit 89170-04210 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The list shows the vehicles recorded in our data for this part number:

• Toyota Tacoma N200 (2004-2015)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Also have the fault memory read out beforehand, because only this log shows whether the control unit is defective or whether a plug 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 89170-04210 work?

First you read out the fault memory and enclose the log. Then you disconnect the battery and only then remove the control unit. Afterwards you create a repair order online and pack the unit well.

Airbag24 tests the sent-in unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Processing usually takes 3–4 working days.

Your own unit is then sent back. The processing time covers only the testing, repairing and checking 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 89170-04210 get to Airbag24?

You send in the control unit as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the control unit shock-proof.