Airbag control unit with part number 89170-04731

What does the airbag control unit 89170-04731 do?

The airbag control unit 89170-04731 is the central control unit of the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors and decides in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered.

In operation the unit monitors the entire system continuously. If it detects a fault, it shows this via the airbag warning light in the instrument cluster.

After an accident the airbag control unit stores crash data and locks itself.

Why does the control unit 89170-04731 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. A normal diagnostic tool cannot erase this data. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Stored crash data remains in the memory until Airbag24 removes it during the repair. The unit can therefore fail even without any visible deployment of the airbags.

The other causes concern the electronics and their contacts. A plug with moisture or corrosion can lead to faults just as an aged component on the circuit board can.

How can you tell that the 89170-04731 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and a fault message appears there. The diagnostic tool gets no connection to the control unit, and the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then fail to trigger in an emergency.

The light and the message are the indication that a fault is stored in the system. A warning light that stays on permanently is therefore a clear signal.

Which vehicles is the 89170-04731 fitted in?

The airbag control unit 89170-04731 is fitted in these vehicles: Toyota Tacoma N300 (2015-2019) and N300 Facelift (2019-2023).

The vehicles are listed individually here.

• Toyota Tacoma N300 (2015-2019)
• Toyota Tacoma N300 Facelift (2019-2023)

Two steps help during removal. 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 only this record 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 89170-04080, 89170-04120, 89170-04150, 89170-04570.

How does the repair of the 89170-04731 work?

First read out the fault memory, then disconnect the battery and only then remove the control unit 89170-04731. Create a repair order online, attach the log and send the well-packed unit in. Checking, repairing and testing at Airbag24 take 3–4 working days as a rule.

Airbag24 checks the unit on the test bench, replaces defective components where needed, erases the stored crash data and carries out a function test. Afterwards your own unit is 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 89170-04731 get to Airbag24?

You send the control unit 89170-04731 as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

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