Airbag control unit with part number 89170-07140

What does the airbag control unit 89170-07140 do?

The airbag control unit 89170-07140 is the control centre of the restraint system (SRS) on Toyota. It reads the signals from the crash sensors, decides within milliseconds in an impact whether airbags and seatbelt pretensioners are triggered, and checks the system continuously. It shows detected faults via the airbag warning light.

After an accident the unit stores crash data and then locks itself. All components of the restraint system depend on this evaluation, which is why the function of the control unit is of central importance for safety in the vehicle.

Why does the control unit 89170-07140 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool cannot remove it. Other causes include aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes, for example from a weak battery or jump-starting.

Crash data remains in the unit's memory after an accident until it is erased. For this, it is not necessary that an airbag has been triggered.

The other causes are fairly general. Electronics age, solder joints can go cold, and moisture and corrosion attack plug connections. Voltage spikes also stress the unit.

How can you tell that the 89170-07140 is defective?

A defect shows when the airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool cannot connect to the control unit, or the fault memory cannot be cleared. Airbags and seatbelt pretensioners may then possibly not trigger in an emergency.

• Airbag warning light in the instrument cluster lights up permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool finds no connection to the control unit
• Fault memory cannot be cleared

The warning light is an unmistakable sign that the system has detected a fault. Reading out the fault memory then shows the next step.

Which vehicles is the 89170-07140 fitted in?

The 89170-07140 is fitted in these vehicles: Toyota Avalon XX20 (2000-2004).

The list shows the vehicles in which the part number is recorded with us.

• Toyota Avalon XX20 (2000-2004)

On the one hand, compare the part number on the label of the removed unit with this page. That only ensures that you have the right unit. On the other hand, have the fault memory read out beforehand. Only this log 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 89170-07121.

How does the repair of the 89170-07140 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Create a repair order online and pack the unit well before sending it in. Airbag24 checks it, repairs defective components, erases the crash data and carries out a function test; processing usually takes 3–4 working days.

The sequence is mandatory for safety reasons, so please keep to it during removal.

After the function test, your own unit goes 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 89170-07140 get to Airbag24?

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

Put the printed repair order into the parcel and pack the unit shock-proof.