Airbag control unit with part number 89170-04252

What does the airbag control unit 89170-04252 do?

The airbag control unit 89170-04252 is the central control unit of the restraint system in Toyota vehicles. It evaluates the crash sensors, decides in a crash whether airbags and seatbelt pretensioners fire, and monitors the system continuously.

Faults are indicated by the airbag warning light. After an accident the unit stores crash data and locks itself.

In everyday driving you won't notice any of this, because the control unit checks the sensors, firing circuits and power supply in the background.

Why does the control unit 89170-04252 fail?

Crash data stored after an accident is the most common cause with the 89170-04252, even if no airbag has deployed; an ordinary diagnostic tool cannot erase it. Other possible causes are aged components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

An airbag having deployed is not necessary for this data to be stored.

The other causes act independently or together. Electronics age, solder joints can go cold, and moisture or corrosion affects the contacts. Voltage spikes, for example from a weak battery or jump-starting, put additional strain on the circuit.

How can you tell that the 89170-04252 is defective?

The airbag warning light in the instrument cluster stays on permanently or comes on intermittently, and an error message appears. A diagnostic tool finds no connection to the control unit on the 89170-04252, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light reports the defect as soon as the system detects it. Please have the system checked promptly rather than waiting for further warnings.

Even a light that only comes on intermittently indicates a fault in the restraint system and must not be ignored.

Which vehicles is the 89170-04252 fitted in?

This list applies to part number 89170-04252. The control unit is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

Here are the vehicles with this part number:

• Toyota Tacoma N200 (2004-2015)

First compare the part number on the label of the removed unit with this page; that confirms you have the right unit in front of you. Have the fault memory read out beforehand as well. Only that result shows whether the control unit is defective or whether 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 89170-04252 work?

On the control unit 89170-04252, have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Airbag24 usually checks, repairs and tests it within 3–4 working days.

At Airbag24 the unit first goes onto the test bench. There, defective components are replaced, the stored crash data is erased and a function test is carried out. Afterwards your own unit is sent back to you.

The sequence of steps serves your safety and must therefore be followed. 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 89170-04252 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 returns the 89170-04252 to you by UPS after the repair.

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