Airbag control unit with part number 89170-02A70

What does the airbag control unit 89170-02A70 do?

The airbag control unit 89170-02A70 is the central control unit of the restraint system (SRS) for Toyota. It processes the signals from the crash sensors, decides within fractions of a second in an accident on airbags and seatbelt pretensioners, and monitors the system continuously. It reports faults via the airbag warning light.

After an accident, the unit stores crash data and locks itself.

Why does the control unit 89170-02A70 fail?

Stored crash data is the most common cause after an accident, even if no airbag has deployed; a standard diagnostic tool cannot erase it. Other causes include ageing electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Which of these causes applies in an individual case is shown only by reading the fault memory. Voltage spikes occur, for example, with a weak battery or when jump-starting.

How can you tell that the 89170-02A70 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, an error message appears in the instrument cluster, the diagnostic tool cannot find the control unit, and the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The warning light is therefore the most important warning sign. A permanently lit indicator cannot simply be ignored.

Which vehicles is the 89170-02A70 fitted in?

The control unit 89170-02A70 is fitted in these vehicles: Toyota Matrix E140 (2008-2014).

The following list names the vehicles that are recorded in our data for this part number.

• Toyota Matrix E140 (2008-2014)

Compare the part number on the label of the removed unit with this page; that only confirms that it is the right unit. Also have the fault memory read out beforehand, because only the result shows whether the control unit is defective or 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 89170-02A70 work?

First have the fault memory read out and attach the log. Then disconnect the battery before you remove the control unit. Next, create a repair order online and send the unit in well packed.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Checking, repairing and testing takes 3–4 working days as a rule. After that, your own unit is returned 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 89170-02A70 get to Airbag24?

You send the unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back by UPS.

Put the printed repair order into the parcel and pack the control unit so that it is shockproof.