Airbag control unit with part number 89170-52M50

What does the airbag control unit 89170-52M50 do?

The airbag control unit 89170-52M50 is the central control unit of the restraint system (SRS) of Toyota. It processes the crash sensor signals, decides within milliseconds in an accident whether airbags and seatbelt pretensioners fire, and monitors the system continuously. It shows detected faults via the airbag warning light.

During operation the unit checks the components of the system. After an accident it stores crash data and locks itself.

Why does the control unit 89170-52M50 fail?

Stored crash data after an accident is the most common cause, even if no airbag has deployed, and a normal diagnostic tool cannot erase it. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible causes.

The crash data remains in the unit's memory even if the vehicle then keeps running normally. That is why it is the starting point of every fault search.

The other causes concern the electronics. Components age, solder joints can go cold, and moisture or corrosion affect the plug connections. Voltage spikes arise, for example, with a weak battery or during a jump start.

How can you tell that the 89170-52M50 is defective?

A fault shows up on the airbag warning light, which lights up permanently or intermittently, and in error messages. A diagnostic tool without a connection to the control unit, or a fault memory that cannot be cleared, also belongs to the signs.

• Airbag warning light is on permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

In an emergency, the airbags and seatbelt pretensioners may then not deploy. If you notice these signs, have the system checked promptly.

Which vehicles is the 89170-52M50 fitted in?

The control unit 89170-52M50 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017). You compare this with the details in this section to check whether your car is affected.

The following overview shows the assignment to this part number.

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

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Have the fault memory read out beforehand, because only the result 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 2310009950, 89170-0D300, 89170-0D320, 89170-0D590, 89170-0D600, 89170-0D620.

How does the repair of the 89170-52M50 work?

First have the fault memory read out and attach the log. Then disconnect the battery, and only after that remove the control unit. Next, create a repair order online and send the unit in well packed.

At Airbag24 the unit is checked on the test bench, defective components are replaced, stored crash data is deleted and a function test is run. Processing usually takes 3–4 working days. The unit, now repaired, is then returned 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 89170-52M50 get to Airbag24?

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

Put the printed repair order into the parcel and pack the control unit so that it is shock-resistant.