Airbag control unit with part number 89170-52M20

What does the airbag control unit 89170-52M20 do?

The airbag control unit 89170-52M20 controls the restraint system (SRS) in Toyota vehicles. In a crash it evaluates the messages from the crash sensors and decides within milliseconds whether airbags and seatbelt pretensioners trigger. In addition it monitors the entire system continuously and reports faults.

Faults appear via the airbag warning light in the instrument cluster, possibly together with a fault message in the display.

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

Why does the control unit 89170-52M20 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed. Aged components, cold solder joints, moisture and corrosion on plug connectors, and voltage spikes are also possible. Airbag24 erases the crash data during the repair, because a normal diagnostic tool cannot do that.

The unit records an event even if the airbags remain untouched.

The other causes mainly concern the electronics themselves. Components age with time, solder joints can be cold, and moisture or corrosion attack plug connectors.

Voltage spikes occur, for example, with a weak battery or when the vehicle is started with a jump start. Which cause applies only becomes clear when the unit is examined.

How can you tell that the 89170-52M20 is defective?

You recognise a defect by an airbag warning light in the instrument cluster that stays on permanently or intermittently, by a fault message in the display, by a diagnostic tool that cannot connect to the control unit, or by a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then not trigger.

The warning light is the most direct indication the vehicle gives. After the ignition is switched on it lights up briefly for a check and then goes out again.

If the light stays on or comes on while driving, have the vehicle checked promptly.

Which vehicles is the 89170-52M20 fitted in?

For Toyota, the data for this part number lists these vehicles. The control unit 89170-52M20 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017).

The list shows the vehicles that are on record for this part number. First check whether your vehicle is among them.

• Toyota Yaris XP130 2nd Facelift (2017-2020)
• Toyota Yaris XP130 (2010-2014)
• Toyota Yaris XP130 1st Facelift (2014-2017)

In addition, compare the part number on the label of the removed unit with this page. This only shows you that it is the right unit. Have the fault memory read out beforehand, because only that shows whether the control unit 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 2310009950, 89170-0D300, 89170-0D320, 89170-0D590, 89170-0D600, 89170-0D620.

How does the repair of the 89170-52M20 work?

First have the fault memory read out and attach the log. Then disconnect the battery, remove the control unit and create a repair order online. Airbag24 checks the unit, repairs defective components, erases the stored crash data and carries out a function test.

The order is a safety matter, so the control unit is removed only after the battery has been disconnected. Then pack it well before you send it in.

Processing at Airbag24 usually takes 3–4 working days, and this covers only checking, repairing and testing.

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 89170-52M20 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. Airbag24 returns the unit to you by UPS after the repair.

The printed repair order goes into the parcel, and the unit is packed shockproof.