Airbag control unit with part number 89170-52M30

What does the airbag control unit 89170-52M30 do?

This control unit is the central control unit of the restraint system (SRS) for Toyota. It checks the signals of the crash sensors and decides in a crash within milliseconds which airbags and seatbelt pretensioners are triggered. It monitors the system continuously and reports faults via the airbag warning light.

In operation, the electronics compare measured values with stored specifications. Deviations are documented in the fault memory.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-52M30 fail?

The most common cause is crash data stored after an accident, even if no airbag was triggered; a normal diagnostic tool does not erase it. In addition, aged components, cold solder joints, moisture, corrosion at plug connections and voltage spikes can cause the failure.

The remaining causes concern the electronics and their surroundings. These include:

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

How can you tell that the 89170-52M30 is defective?

A defect shows as the airbag warning light in the instrument cluster, which lights up permanently or intermittently, and as an error message. Likewise, a defect is indicated if the diagnostic tool makes no connection to the control unit or the fault memory cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

Typical signs at a glance:

• airbag warning light on permanently
• airbag warning light on intermittently
• error display on the screen
• diagnostic tool without connection to the control unit
• fault memory cannot be cleared

Which vehicles is the 89170-52M30 fitted in?

The control unit 89170-52M30 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017). Anyone wanting to compare their car will find the matching line in the list.

The following section lists the vehicles known to us for this part number.

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

Comparing the part number on the label of the removed unit with this page only confirms that the correct unit was removed. The fault memory is decisive: only reading it out 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 2310009950, 89170-0D300, 89170-0D320, 89170-0D590, 89170-0D600, 89170-0D620.

How does the repair of the 89170-52M30 work?

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

Airbag24 first examines the unit on the test bench. Defective components are then repaired, crash data erased and a function test carried out. Your own unit then goes back to you.

The sequence at the start serves safety on the restraint system.

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 89170-52M30 get to Airbag24?

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

A printed repair order belongs in the parcel. Pack the unit shock-resistantly so it survives transport undamaged.