Airbag control unit with part number 89170-44040

What does the airbag control unit 89170-44040 do?

The airbag control unit 89170-44040 is the control centre of the restraint system (SRS) for Toyota. Based on the crash sensors it determines whether and which airbags and seatbelt pretensioners trigger in an accident, within milliseconds.

During operation the unit checks the system continuously. If it detects a fault, it reports it via the airbag warning light.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-44040 fail?

The most common cause is stored crash data after an accident, even if no airbag was triggered. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start.

A normal diagnostic tool cannot erase the crash data. Airbag24 handles this during the repair, together with the inspection of the other components.

The other causes lie in the electronics themselves or at their connections. Aged components and cold solder joints affect the unit directly; moisture and voltage spikes act from outside.

How can you tell that the 89170-44040 is defective?

A defect is indicated by the airbag warning light in the instrument cluster, an error message, a missing connection to the diagnostic tool and a fault memory that cannot be cleared. In that case the airbags and seatbelt pretensioners may possibly not trigger in an emergency.

• The airbag warning light stays on or flickers at times.
• A warning message appears in the instrument cluster.
• The diagnostic tool cannot reach the control unit.
• The fault memory remains after an attempt to clear it.

The light is the clearest sign, because it comes directly from the control unit. A missing connection to the diagnostic tool can also lie in plugs or cables; only the readout clarifies this.

Which vehicles is the 89170-44040 fitted in?

The control unit 89170-44040 belongs to these vehicles: Toyota Avensis Verso XM20 (2001-2003) and XM20 Facelift (2003-2005). The assignment follows the part number alone.

Below you will find the individual vehicle types that belong to this part number.

• Toyota Avensis Verso XM20 (2001-2003)
• Toyota Avensis Verso XM20 Facelift (2003-2005)

Comparing the part number on the label of the removed unit with this page confirms that it is the right unit. Have the fault memory read out beforehand, because it 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 89170-44050, 89170-44060.

How does the repair of the 89170-44040 work?

You have the fault memory read out first and attach the log, then disconnect the battery before removing the control unit 89170-44040. Then create the repair order online and pack the unit carefully. Airbag24 then carries out inspection, repair, deletion of the crash data and a function test.

The sequence is prescribed for safety reasons.

Processing at Airbag24 usually takes 3–4 working days. Afterwards your own unit is sent back.

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 89170-44040 get to Airbag24?

Either the unit goes to Airbag24 as a parcel, or a UPS collection is booked for an extra charge. The return after the repair is also made by UPS.

The printed repair order goes into the parcel; the unit itself needs shock-proof packaging.