Airbag control unit with part number 89170-04331

What does the airbag control unit 89170-04331 do?

The airbag control unit 89170-04331 coordinates the restraint system (SRS) of Toyota in the vehicle. In an accident it evaluates the sensors, decides on airbags and seatbelt pretensioners, and monitors the system continuously. After an accident it stores crash data and locks itself.

If the unit detects a fault, it passes it on via the airbag warning light in the instrument cluster. The evaluation is so fast that the triggering is established before the impact.

The sensors supply the data, the electronics make the decision, and the output stages carry it out.

Why does the control unit 89170-04331 fail?

Among the most common causes are crash data from an accident, without any airbag having fired; an ordinary diagnostic tool gives no access for erasing it. Aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes are also among the causes.

Stored crash data keeps the fault state alive, and this applies even when nothing on the vehicle is noticeable any more. Besides this, aged components, cold solder joints and moisture in plugs count as typical triggers, as do voltage spikes, for example from a weak battery or a jump start.

How can you tell that the 89170-04331 is defective?

The airbag warning light in the instrument cluster indicates the defect as soon as it lights permanently or intermittently. A fault message, a diagnostic tool without contact to the control unit, or a fault memory that cannot be cleared also points to it. In a real emergency, the airbags and seatbelt pretensioners may then fail to deploy.

The warning light is the first sign you notice in the vehicle. If it lights up, have the finding clarified promptly. Fault messages in the instrument cluster and a fault memory that cannot be emptied are likewise signs that justify an inspection.

Which vehicles is the 89170-04331 fitted in?

Compare the list with your vehicle before removal. The control unit 89170-04331 is fitted in these Toyota vehicles: Toyota Tacoma N200 (2004-2015).

The assignment is listed here:

• Toyota Tacoma N200 (2004-2015)

Matching the part number with this page only confirms that it is the right unit. The cause is established only by the fault memory that has been read out, because it shows whether the control unit is defective or a plug or cable is affected.

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 89170-04331 work?

For the check at Airbag24, plan on 3–4 working days as a rule. Before removal, have the fault memory read out and disconnect the battery. Then create a repair order online and send in the unit well packed.

At Airbag24 the unit is inspected on the test bench, defective components are repaired, crash data is erased and a function test is finally carried out. Your own unit is then sent back 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 89170-04331 get to Airbag24?

You send the unit as a parcel or book a UPS collection. UPS brings it back to you after the repair.

Enclose the printed repair order and a shockproof protection for the control unit.