Airbag control unit with part number 89170-04470

What does the airbag control unit 89170-04470 do?

The airbag control unit 89170-04470 is the central unit within the restraint system (SRS) of Toyota. It processes the signals from the crash sensors, decides on triggering in a crash within fractions of a second, and monitors the system continuously.

If the unit detects a fault, it reports it via the airbag warning light in the instrument cluster. Monitoring therefore also applies to the time without a crash.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 89170-04470 fail?

The most common cause with the 89170-04470 is stored crash data after a crash, even if no airbag has deployed. Aged components, solder joints, moisture and corrosion, and voltage spikes are also considered.

Crash data cannot be removed with a normal diagnostic tool. Airbag24 deletes it during the repair.

In detail, the further causes are:

• aged electronics
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or a jump start

Only the examination of the unit shows which cause is present.

How can you tell that the 89170-04470 is defective?

The airbag warning light in the instrument cluster indicates a defect in the 89170-04470 when it stays on permanently or intermittently. Accompanying this, an error message appears, the diagnostic tool finds no connection, and the fault memory cannot be cleared.

Airbags and seatbelt pretensioners may then fail to deploy in an emergency. This also applies to vehicles that appear unremarkable in everyday use.

A check of the fault memory clarifies whether the control unit itself is affected or whether another cause is present.

Which vehicles is the 89170-04470 fitted in?

Which models may be affected is stated here. The airbag control unit 89170-04470 is fitted by Toyota in these vehicles: Toyota Tacoma N200 (2004-2015).

The vehicles in detail:

• Toyota Tacoma N200 (2004-2015)

First compare the part number on the label of the removed unit with this page. This only confirms that it is the right unit. Have the fault memory read out before removal, because only this result shows whether the control unit is defective or whether a plug or a 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 89170-04470 work?

For the repair of the 89170-04470, the fault memory is first read out and the log is attached to the unit. Then disconnect the battery and remove the control unit. Afterwards, create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, repairs defective components, deletes stored crash data and carries out a function test. Afterwards, your own unit goes 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 89170-04470 get to Airbag24?

You send the control unit 89170-04470 to Airbag24 as a parcel, or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof. Make sure it cannot move inside the carton.