Airbag control unit with part number 89170-04640

What does the airbag control unit 89170-04640 do?

The airbag control unit 89170-04640 is the central control unit of the restraint system (SRS) of Toyota. It processes the signals from the crash sensors, decides in a crash on the triggering of airbags and seatbelt pretensioners, and monitors the system constantly. Detected faults are shown via the airbag warning light.

After an accident the unit stores crash data and locks itself. The protective effect of the system depends on this unit working reliably.

Why does the control unit 89170-04640 fail?

Stored crash data is the most common cause in the control unit 89170-04640, even if no airbag was deployed. A normal diagnostic tool cannot erase it. Other causes include aged components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data arises in the unit after the accident. Airbag24 erases it during the repair, so you do not need to do anything.

Aged components, cold solder joints and moisture at the plugs can damage the unit just as voltage spikes can, for example from a weak battery or a jump start.

How can you tell that the 89170-04640 is defective?

A defect in the 89170-04640 shows up as the airbag warning light in the instrument cluster, which lights up permanently or intermittently.

• Fault message in the instrument cluster.
• No connection between the diagnostic tool and the control unit.
• A fault memory that cannot be erased.

In an emergency, airbags and seatbelt pretensioners may then fail to trigger. The warning light must therefore be taken seriously as soon as it lights up.

Which vehicles is the 89170-04640 fitted in?

The 89170-04640 is fitted in these vehicles: Toyota Tacoma N200 (2004-2015).

The following vehicles are concerned in detail:

• Toyota Tacoma N200 (2004-2015)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the correct unit. Have the fault memory read out beforehand; only this 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 89170-04640 work?

First have the fault memory read out and enclose the log in the package. Then disconnect the battery and only then remove the control unit 89170-04640. Next, create a repair order online and pack the unit well.

Airbag24 checks the unit on the test bench, replaces defective components, erases stored crash data and carries out a function test. Processing at Airbag24 usually takes 3–4 working days.

The unit then returns 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 89170-04640 get to Airbag24?

You can send the parcel yourself, or book a UPS collection for an extra charge. The return of the control unit 89170-04640 after the repair is made by UPS.

Place the printed repair order in the parcel; pack the unit shock-proof.