Airbag control unit with part number 89170-05311

What does the airbag control unit 89170-05311 do?

The airbag control unit 89170-05311 controls the restraint system (SRS) for Toyota. It evaluates the crash sensors, decides in an accident within milliseconds on the triggering of airbags and seatbelt pretensioners, and monitors the system continuously. After an accident, it stores crash data and locks itself.

It checks sensors, wiring and trigger units continuously. Detected deviations are stored in the fault memory and shown via the airbag warning light in the instrument cluster.

In a crash there is no time for queries, so the unit works according to fixed procedures. A failure therefore affects the entire protective effect.

Why does the control unit 89170-05311 fail?

The most common cause is crash data that remains in the memory after an accident, even if no airbag was triggered; a normal diagnostic tool cannot remove it. In addition, there are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

These entries remain until they are removed during repair. They do not show how severe the accident was, only that the unit recorded an event.

The other causes arise in normal operation: components change over the years, connections corrode, and a weak battery or jump-starting brings voltage spikes into the system.

How can you tell that the 89170-05311 is defective?

A defect on the 89170-05311 shows through the airbag warning light in the instrument cluster, which stays on permanently or intermittently, and through an error message in the instrument cluster. The diagnostic tool then finds no connection to the control unit.

The light is an unmistakable sign that the restraint system has detected a fault. Some faults keep it lit permanently, others only intermittently.

In an emergency, the airbags and seatbelt pretensioners may therefore fail to deploy. As soon as you notice any of these signs, have them checked.

Which vehicles is the 89170-05311 fitted in?

The 89170-05311 is fitted in these vehicles: Toyota Avensis T250 (2003-2006) and T250 Facelift (2006-2008).

The assigned vehicles are listed below.

• Toyota Avensis T250 (2003-2006)
• Toyota Avensis T250 Facelift (2006-2008)

First compare the part number on the label of the removed unit with this page. This ensures that it is the correct unit. Then have the fault memory read out in advance, because only this result shows whether the control unit itself is defective or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-042D50, 89170-05121, 89170-05122, 89170-05160, 89170-05310.

How does the repair of the 89170-05311 work?

First have the fault memory read out and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send the unit in well packed. Airbag24 checks it, replaces defective components, erases the crash data and carries out a function test.

The sequence serves your safety and is therefore binding.

At Airbag24, the unit is examined on the test bench. Your unit is then returned to you. Processing usually takes 3–4 working days; this time applies only to the work at Airbag24. 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 89170-05311 get to Airbag24?

You send the control unit 89170-05311 in as a parcel or book a UPS collection for an extra charge. After repair, Airbag24 sends it back to you by UPS.

Put the printed repair order into the parcel and pack the unit shockproof.