Airbag control unit with part number 89170-0DE20

What does the airbag control unit 89170-0DE20 do?

The airbag control unit 89170-0DE20 is the control unit of the restraint system (SRS) for Toyota. From the signals of the crash sensors it calculates in an accident, within milliseconds, which airbags and seatbelt pretensioners are triggered; it also checks the system continuously.

It detects faults and reports them via the airbag warning light. After an accident it stores crash data and then locks itself.

The monitoring works automatically, without the driver having to intervene.

Why does the control unit 89170-0DE20 fail?

With the 89170-0DE20, the most common cause is that crash data has been stored after an accident, even if no airbag was triggered. Aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes also come into consideration.

This crash data cannot be removed with a normal diagnostic tool. Airbag24 erases it during the repair.

The other causes relate to the condition of the electronics: components age, solder joints can go cold, and moisture impairs contacts. Voltage spikes, for example from a weak battery or from starting with external power, can also damage the unit.

How can you tell that the 89170-0DE20 is defective?

The airbag warning light in the instrument cluster is the first sign of a defect on the 89170-0DE20; it lights up permanently or intermittently. It is accompanied by an error message, a missing connection to the diagnostic tool and a fault memory that you cannot clear.

In an emergency, airbags and seatbelt pretensioners may not be triggered then.

The warning light therefore shows the fault directly.

Which vehicles is the 89170-0DE20 fitted in?

There is a model-based assignment for this unit. The control unit 89170-0DE20 is fitted in these vehicles: Toyota Yaris XP210 (from 2020).

The assignment is listed here:

• Toyota Yaris XP210 (from 2020)

The first step is the comparison: if the number on the label of the removed unit matches this page, it is the right unit. That tells you nothing yet about its condition. Only the fault memory read out beforehand shows whether the control unit is defective or whether a plug and cable are the cause.

For the same vehicles, we also repair control units with the part numbers 89170-0D730, 89170-0DE60, 89170-0DF50, 89170-52350, 89170-K0060.

How does the repair of the 89170-0DE20 work?

Have the fault memory read out first and enclose the log with the unit. Then disconnect the battery, and only then remove the control unit 89170-0DE20; afterwards create a repair order online and send in the well-packed unit.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the crash data and carries out a function test. Then the unit goes back to the sender.

For these steps at Airbag24, allow 3–4 working days as a rule. The time refers only to 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 89170-0DE20 get to Airbag24?

You send the control unit 89170-0DE20 to Airbag24 as a parcel, or you book a UPS collection for an extra charge. After the repair it comes back to you by UPS.

Your printed repair order goes into the parcel, and the unit must be packed shock-proof.