Airbag control unit with part number 89170-04330

What does the airbag control unit 89170-04330 do?

The 89170-04330 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and reports faults via the airbag warning light. After an accident it stores crash data and locks itself.

During operation the control unit monitors the entire system. To do this it checks sensors, wires and output stages and compares the measured values with stored specifications. Conspicuous values go into the fault memory, and from there the warning light is triggered.

Seatbelt pretensioners belong to this system: in an emergency the control unit triggers them together with the airbags. Without its evaluation, the restraint system cannot work as intended.

Why does the control unit 89170-04330 fail?

The most common cause for the 89170-04330 is stored crash data from an accident, even if no airbag fired. Ordinary diagnostic tools cannot erase it; other causes include aged components, cold solder joints, moisture and voltage spikes.

An accident does not have to have led to an airbag deployment. Even an impact in which no airbags fired can place crash data in the unit.

The other causes relate to connections, electronics and the power supply. Which of them applies in the individual case is shown only by the read-out of the fault memory.

How can you tell that the 89170-04330 is defective?

A defect on the 89170-04330 shows itself through the airbag warning light in the instrument cluster, which lights permanently or intermittently, and through an error message in the instrument cluster. In addition the diagnostic tool does not connect to the control unit, and the fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then possibly not trigger. Typical signs are:

• airbag warning light on permanently or intermittently
• error message in the instrument cluster
• diagnostic tool does not connect to the control unit
• fault memory cannot be cleared

Which vehicles is the 89170-04330 fitted in?

The airbag control unit 89170-04330 is intended for Toyota. The unit is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The vehicles in which this control unit was installed are listed here:

• Toyota Tacoma N200 (2004-2015)

Two steps clarify the situation. First compare the part number on the label of the removed unit with this page; this only confirms that it is the right unit. Also have the fault memory read out beforehand, because the result shows whether the control unit 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 89170-04330 work?

First have the fault memory read out and the log attached; then disconnect the battery and only then remove the 89170-04330. Processing at Airbag24 usually takes 3–4 working days.

Then create the repair order online and send in the unit well packed. Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. The own unit is then 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 89170-04330 get to Airbag24?

You send the control unit 89170-04330 in as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns the unit to you by UPS.

Enclose the printed repair order and pack the unit shock-resistant so that it survives transport undamaged.