Airbag control unit with part number 89170-52G40

What does the airbag control unit 89170-52G40 do?

The airbag control unit 89170-52G40 controls the restraint system (SRS) of Toyota. It processes the messages from the crash sensors and, in the event of an impact, decides within milliseconds which airbags and seatbelt pretensioners to trigger.

It also monitors all connected components and shows faults via the airbag warning light in the instrument cluster.

After an accident the unit stores crash data and locks itself. You will learn step by step on this page how to deal with it.

Why does the control unit 89170-52G40 fail?

Stored crash data from an earlier accident is the most common cause, even if no airbag was triggered; a normal diagnostic tool cannot erase it. Aged components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes such as from jump starting or a weak battery are also possible causes.

The crash data remains in the memory even after driving. Ordinary tools cannot erase it, so the entry persists.

Apart from crash data, ageing, solder joints and plug connections play a role. Voltage spikes from the on-board electrics also belong here, and the inspection on the test bench distinguishes these cases.

How can you tell that the 89170-52G40 is defective?

A defect in control unit 89170-52G40 first becomes noticeable through the airbag warning light in the instrument cluster, which lights constantly or only intermittently. In addition, an error message, a diagnostic tool without a connection and a fault memory that cannot be cleared are signs.

The warning light is the clearest indication. A defect can mean that airbags and seatbelt pretensioners may not trigger in an emergency, so have the system checked promptly.

A diagnostic tool that does not connect with the control unit can point to the control unit itself, but need not. Only reading out the memory clarifies the cause.

Which vehicles is the 89170-52G40 fitted in?

According to our information, control unit 89170-52G40 is fitted in the following vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017).

The list shows 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)

A first step is to compare the part number on the label of the removed unit with this page, so that you have the right unit. Before removing anything, have the fault memory read; only the result shows whether the control unit is defective or a plug or cable is causing the fault.

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 89170-52G40 work?

The process begins with reading the fault memory; enclose the log. Then disconnect the battery, remove control unit 89170-52G40 and send it in after creating a repair order online, well packed. Airbag24 generally needs 3–4 working days for inspection, repair and testing; during this time we replace defective components, erase stored crash data and carry out a functional test.

The order of the steps serves safety, which is why the unit is removed only after the battery has been disconnected.

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 89170-52G40 get to Airbag24?

You send control unit 89170-52G40 yourself as a parcel or arrange a UPS collection for an extra charge. The return after repair is by UPS.

Pack the unit shock-proof and enclose the printed repair order.