Airbag control unit with part number 89170-04440

What does the airbag control unit 89170-04440 do?

The unit 89170-04440 is the control unit of the restraint system (SRS) for Toyota. It processes signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered; in addition, it monitors the system continuously.

During operation the unit checks the connected components. If it finds a fault, it stores the fault and displays it via the airbag warning light.

After an accident, the control unit secures crash data and then locks itself.

Why does the control unit 89170-04440 fail?

The most common cause is that crash data were stored after an accident, even if no airbag was deployed. Other causes are aged components, cold solder joints, moisture and corrosion, and voltage spikes. Crash data can often not be erased on this control unit; if you want them erased, contact Airbag24 briefly before sending the unit in.

Crash data are created as soon as the control unit registers an accident and remain in the unit afterwards.

Over the years, electronic components age, and moisture or corrosion on plug connections disrupt the contact.

Cold solder joints and voltage spikes, for example from a weak battery or a jump-start, additionally strain the unit.

How can you tell that the 89170-04440 is defective?

The airbag warning light, which lights up constantly or intermittently, is the first sign; in addition there are an error message in the instrument cluster, no connection to the diagnostic tool and a fault memory that cannot be cleared. Then airbags and seatbelt pretensioners may not deploy in an emergency.

The warning light is the signal the control unit holds ready for you. It is no coincidence and deserves a read-out.

A read-out shows which message is stored and whether the control unit or a cable is the cause.

Which vehicles is the 89170-04440 fitted in?

The control unit 89170-04440 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015). This applies to exactly this number.

The vehicles in detail:

• Toyota Tacoma N200 (2004-2015)

Compare the part number on the label of the removed unit with this page first, because that only ensures that it is the correct unit. Then have the fault memory read out, because only the 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 89170-04440 work?

First have the fault memory read out and attach the log, then disconnect the battery and remove the control unit. Next, create a repair order online and send in the packed unit. Airbag24 checks it on the test bench, replaces defective components and carries out a function test, after which the unit goes back to you.

Removal follows a fixed order for safety reasons.

Processing at Airbag24 usually takes 3–4 working days. If you want the crash data erased, contact Airbag24 briefly before sending the unit in.

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 89170-04440 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

Put the printed repair order into the parcel and pack the control unit shockproof.