Airbag control unit with part number 89170-52480

What does the airbag control unit 89170-52480 do?

The airbag control unit 89170-52480 is the central control unit of the restraint system (SRS) for Toyota. It processes the signals from the crash sensors and decides within milliseconds in the event of an accident whether the airbags and seatbelt pretensioners are triggered.

It also monitors the system continuously. A fault is indicated by the airbag warning light in the instrument cluster.

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

Why does the control unit 89170-52480 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Other causes are aged components, moisture and corrosion at plug connections, and voltage spikes.

A standard diagnostic tool does not clear the crash data. In addition, the following causes may be responsible:

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

The inspection at Airbag24 shows which of these applies in the individual case.

How can you tell that the 89170-52480 is defective?

A defect shows at the airbag warning light, in fault messages in the instrument cluster, in a missing connection to the diagnostic tool, and in a fault memory that cannot be cleared.

The warning light may be on permanently or intermittently, and the fault message stays in the instrument cluster until the system has been checked. In such cases the diagnostic tool cannot reach the control unit.

Do not treat this as a harmless message. In an emergency the airbags and seatbelt pretensioners may not deploy, so have the system checked promptly.

Which vehicles is the 89170-52480 fitted in?

The control unit 89170-52480 is fitted in these vehicles: Toyota Echo XP10 (1999-2002) and XP10 Facelift (2002-2005).

The vehicles at a glance:

• Toyota Echo XP10 (1999-2002)
• Toyota Echo XP10 Facelift (2002-2005)

Comparing the part number on the label of the removed unit with this page only confirms that it is the right unit.

Have the fault memory read out beforehand. Only this result shows whether the control unit itself is defective or whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-52050, 89170-52310-93C56.

How does the repair of the 89170-52480 work?

Processing at Airbag24 usually takes 3–4 working days. Beforehand, have the fault memory read out, disconnect the battery and remove the control unit before you create a repair order online.

The order is binding: first the read-out with the enclosed log, then the battery, and only then the removal. Afterwards, pack the unit well and send it in.

Airbag24 checks it on the test bench, replaces defective components, clears the stored crash data and carries out a function test. Your own unit is then sent 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 89170-52480 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. Pack the unit shock-proof.