Airbag control unit with part number 89170-04590

What does the airbag control unit 89170-04590 do?

The airbag control unit 89170-04590 is the central control unit of the restraint system of Toyota. It evaluates the crash sensors, decides in the event of a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The unit reports faults via the airbag warning light in the instrument cluster. Monitoring runs on every journey and covers the sensors, the wiring and the output stages.

The triggering decision is made within fractions of a second, so there is no delay in a crash. After an accident the control unit stores crash data and locks itself.

Why does the control unit 89170-04590 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed, and it cannot be deleted with a normal diagnostic tool. Aged components, cold solder joints, moisture and corrosion, as well as voltage spikes, can also contribute, for example with a weak battery or a jump start.

The crash data remains in the unit even if the vehicle continues without any abnormalities after the accident. The warning light can therefore be on although nothing more is visible on the bodywork.

The other causes arise in everyday use: electronic components change over time, solder joints can become weak, and moisture attacks plug connections. Airbag24 deletes the crash data during the repair.

How can you tell that the 89170-04590 is defective?

The airbag warning light in the instrument cluster is the most important sign: it stays on permanently or intermittently as soon as the system detects a fault. In addition there are fault messages in the instrument cluster, a missing connection to the diagnostic tool, and a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may not trigger if the control unit is affected. Therefore have such a warning checked promptly.

The warning light alone does not show the cause. Only reading out the fault memory establishes whether the control unit or a connected component is affected.

Which vehicles is the 89170-04590 fitted in?

The assignment covers vehicles of Toyota with this control unit. The airbag control unit 89170-04590 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The list shows the vehicles recorded for this part number:

• Toyota Tacoma N200 (2004-2015)

Compare the part number on the label of the removed unit with this page so that you are sure it is the correct unit. Also have the fault memory read out beforehand, because it 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 89170-04590 work?

With the 89170-04590, first have the fault memory read out and enclose the log. Then disconnect the battery and only then remove the unit. Checking, repairing and testing take 3–4 working days as a rule at Airbag24.

Then create a repair order online and send the device in well packed. Airbag24 checks it on the test bench, replaces defective components, deletes stored crash data and carries out a function test. The device 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 89170-04590 get to Airbag24?

You send the control unit 89170-04590 as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Enclose the printed repair order in the parcel and pack the unit shockproof.