Airbag control unit with part number 89170-02A80

What does the airbag control unit 89170-02A80 do?

The airbag control unit 89170-02A80 is the central control unit of the restraint system (SRS) for Toyota. It evaluates the signals from the crash sensors, decides in an accident within fractions of a second which airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

The monitoring covers the sensors, the wiring and the connected components. If the unit detects a fault, it stores it and indicates it via the airbag warning light in the instrument cluster. This self-check runs throughout the entire journey.

After an accident the control unit stores crash data and locks itself. It thus also records what happened during an impact, rather than reacting only to the current state.

Why does the control unit 89170-02A80 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot delete it. Additional causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

The crash data remains in the unit even when the vehicle drives normally again. That is why the warning light can stay on although hardly anything can be seen on the bodywork. Airbag24 deletes the crash data during the repair.

The other causes build up in everyday use: components age, solder joints can be damaged, and moisture attacks the contacts of the plugs. Voltage spikes from the vehicle electrical system, for example when starting with outside help, put additional strain on the electronics.

How can you tell that the 89170-02A80 is defective?

A defect shows up as an airbag warning light in the instrument cluster that stays on permanently or intermittently, as an error message in the instrument cluster, as a lack of connection to the diagnostic tool, or as a fault memory that cannot be cleared.

• Airbag warning light stays on permanently
• Airbag warning light stays on intermittently
• Fault message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In an emergency, airbags and seatbelt pretensioners may not trigger. If you notice any of these displays, have the system checked promptly.

Whether the control unit is actually defective can only be established by reading out the fault memory. The display alone does not prove that yet.

Which vehicles is the 89170-02A80 fitted in?

The assignment applies to Toyota vehicles with this control unit. The airbag control unit 89170-02A80 is fitted in these vehicles: Toyota Matrix E140 (2008-2014).

Here is the list of vehicles for which this part number is stored at Airbag24:

• Toyota Matrix E140 (2008-2014)

Compare the part number on the label of the removed unit with this page; this only ensures that it is the correct unit. Also have the fault memory read out beforehand, because only the result 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 89170-01060, 89170-01070, 89170-01100.

How does the repair of the 89170-02A80 work?

The repair of the 89170-02A80 begins with the fault memory: have it read out, enclose the log, disconnect the battery and only then remove the control unit. Then create a repair order online and send in the well-packed unit. Checking, repairing and testing at Airbag24 normally takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. Afterwards the unit comes 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 89170-02A80 get to Airbag24?

You send the control unit 89170-02A80 as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 sends it back by UPS.

Enclose the printed repair order in the parcel and pack the control unit shockproof.