Airbag control unit with part number 89170-04550

What does the airbag control unit 89170-04550 do?

The airbag control unit 89170-04550 controls the restraint system (SRS) of Toyota. It checks the signals from the crash sensors, determines in an accident whether airbags and seatbelt pretensioners are triggered, and monitors the entire system.

The system reports faults via the airbag warning light in the instrument cluster as soon as the unit detects them. The self-test runs whenever the vehicle is switched on and covers sensors, wiring and output stages.

After an accident the unit stores crash data and locks itself. These entries remain in memory after the incident and are relevant for the repair.

Why does the control unit 89170-04550 fail?

Most often the cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion on connectors, and voltage spikes also affect the unit.

An accident does not have to have triggered the airbags for data to be stored. The vehicle can then drive normally while the crash data stays in the unit.

The other causes affect the electronics regardless of an accident. Components age, solder joints can be damaged, and moisture acts on contacts. Voltage spikes arise, for example, with a weak battery or when jump-starting. Airbag24 erases stored crash data during the repair.

How can you tell that the 89170-04550 is defective?

A defect shows up as the airbag warning light in the instrument cluster, which lights up constantly or intermittently. A fault message in the instrument cluster, a diagnostic tool that cannot connect to the control unit, or a fault memory that cannot be cleared also indicate a problem.

In an emergency the airbags and seatbelt pretensioners may fail to deploy. That affects exactly the protective function the unit is there for.

Whether the control unit itself is affected is established by reading out the fault memory. A warning light alone does not prove it.

Which vehicles is the 89170-04550 fitted in?

This assignment applies to Toyota. The airbag control unit 89170-04550 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

This list shows the vehicles recorded for this part number:

• Toyota Tacoma N200 (2004-2015)

You carry out the label comparison with this page; it only confirms that it is the correct unit. Beforehand have the fault memory read out, because only that shows whether the control unit is defective or 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 89170-04550 work?

The fault memory comes first: have it read out together with the log before you disconnect the battery. Only then remove the control unit 89170-04550. The check at Airbag24 usually takes 3–4 working days.

Then you create a repair order online and pack the unit carefully before sending it. At Airbag24 it is checked on the test bench, defective components are replaced, stored crash data is erased, and a function test follows. Afterwards your own unit is sent 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 89170-04550 get to Airbag24?

You send the control unit 89170-04550 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.