Airbag control unit with part number 89170-02J40

What does the airbag control unit 89170-02J40 do?

The airbag control unit 89170-02J40 coordinates the SRS restraint system in Toyota vehicles. Using the crash sensors it detects an impact and decides within milliseconds whether to fire the airbags and seatbelt pretensioners. At the same time it monitors the system continuously and reports faults via the airbag warning light.

Monitoring runs in the background while you drive. The unit checks lines, sensors and trigger units and continuously compares the measured values with the expected values.

After an accident, the control unit records crash data and locks itself. This function is part of how the system is built.

Why does the control unit 89170-02J40 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered. Further causes are:

• aging electronic components
• cold solder joints
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

Crash data cannot be erased with a normal diagnostic tool. Airbag24 removes it during the repair, so that the unit works afterwards without this stored data.

The other causes can appear only after prolonged use, when components age or connections corrode. A brief overvoltage can additionally stress them.

How can you tell that the 89170-02J40 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, and an error message appears in the instrument cluster. In addition, a diagnostic tool cannot establish a connection to the control unit, and the fault memory cannot be erased.

These signs show that the system no longer works reliably. In an emergency, airbags and seatbelt pretensioners may then not trigger.

If you notice any of these signs, have the condition checked promptly.

Which vehicles is the 89170-02J40 fitted in?

The 89170-02J40 is fitted in these vehicles: Toyota Auris E150 (2006-2010) and E150 Facelift (2010-2012).

The following vehicles are assigned to this part number:

• Toyota Auris E150 (2006-2010)
• Toyota Auris E150 Facelift (2010-2012)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit. Whether the control unit is defective or a connector or cable causes the fault is shown only by reading out the fault memory before removal.

For the same vehicles, we also repair control units with the part numbers 215537-106, 89170-02560, 89170-0W330, 8924502040.

How does the repair of the 89170-02J40 work?

Before anything else, have the fault memory read out and enclose the log. Then disconnect the battery, afterwards remove the 89170-02J40, and create a repair order online. At Airbag24 the unit is checked, repaired and tested.

Pack the unit well and send it in. Airbag24 checks it on the test bench, repairs defective components, erases stored crash data and carries out a function test. Afterwards your own unit goes back to you.

Processing at Airbag24 usually takes 3–4 working days. This period covers only the testing, repair and function test with us.

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 89170-02J40 get to Airbag24?

You send the unit as a package or book a UPS collection for an extra charge. Put the printed repair order into the package and pack the control unit shock-resistant.

After the repair, Airbag24 sends the unit back to you via UPS.