Airbag control unit with part number 89170-04510

What does the airbag control unit 89170-04510 do?

The airbag control unit 89170-04510 controls the restraint system (SRS) of Toyota, including airbags and seatbelt pretensioners. In a crash it determines from the sensor signals within milliseconds which airbags and seatbelt pretensioners are triggered. It reports any faults via the airbag warning light.

The system is monitored continuously, and after an accident the unit stores crash data. It then locks itself. Only the repair lifts the lock.

Without reliable evaluation, the restraint system cannot fulfil its task.

Why does the control unit 89170-04510 fail?

The most common cause in the 89170-04510 is crash data stored after an accident, even if no airbag was triggered. Further causes are aging electronics, moisture and voltage spikes.

A normal diagnostic tool cannot remove the crash data. Other causes that come into consideration are:

• cold solder joints on the circuit boards
• corrosion and moisture at connectors
• aged electronic components
• voltage spikes from the vehicle electrical system, for example during a jump start

Which of these causes applies cannot be said for certain without an inspection.

How can you tell that the 89170-04510 is defective?

A defect on the 89170-04510 can be recognised by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. A fault message there, and a diagnostic tool that finds no connection to the unit, also point to a defect.

These signs are noticed as follows:

• the warning light is on either continuously or intermittently
• a fault message appears in the instrument cluster
• the diagnostic tool finds no connection to the control unit
• the fault memory cannot be erased

In an emergency, airbags and seatbelt pretensioners may not trigger. Such a finding therefore belongs in a prompt inspection.

Which vehicles is the 89170-04510 fitted in?

The control unit 89170-04510 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015). The part number on the unit is what counts, not the car's name.

The following models match this part number:

• Toyota Tacoma N200 (2004-2015)

Compare the label on the removed unit with this page before removing it; that confirms you have the right control unit. Whether it is actually the cause is determined by the fault memory, which you should have read out beforehand, since a connector or a cable can be the cause as well.

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 89170-04510 work?

First have the fault memory read out and enclose the log. Then disconnect the battery, and only then remove the control unit 89170-04510. Next create a repair order online and pack the unit well before sending it in.

Airbag24 checks the unit on the test bench and replaces defective components. Afterwards the team erases stored crash data and carries out a functional test, before your own unit is returned to you.

For testing, repairing and checking, Airbag24 usually allows 3–4 working days. 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 89170-04510 get to Airbag24?

Either you send the unit 89170-04510 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. The return after the repair is made by UPS.

Pack the printed repair order into the parcel as well, and protect the unit with shock-proof packaging.