Airbag control unit with part number 89170-0DC40

What does the airbag control unit 89170-0DC40 do?

The airbag control unit 89170-0DC40 for Toyota is the central control unit of the restraint system (SRS). It continuously evaluates the signals from the crash sensors, determines within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the entire system. Faults are shown by the airbag warning light.

In doing so, it does not only check individual values, but compares measurements with each other and with stored limit values. This makes it possible to see whether the system is ready for use.

After a crash, the unit stores crash data and locks itself.

Why does the control unit 89170-0DC40 fail?

The most common cause is crash data from an earlier accident, even if no airbag was deployed; a normal diagnostic tool cannot erase it. Other possible causes are aged electronics, cold solder joints, moisture with corrosion and voltage spikes.

Aged components lose performance over time, and solder joints that were flawless during manufacture can become cold. Moisture causes corrosion at plug connections, which disturbs the contact.

Voltage spikes occur, for example, with a weak battery or a jump start, and can put a strain on the electronics.

How can you tell that the 89170-0DC40 is defective?

A defect in the control unit 89170-0DC40 shows up as the airbag warning light, which stays on permanently or intermittently. In addition, fault messages appear in the instrument cluster, or the diagnostic tool cannot establish a connection, or a fault memory cannot be cleared.

Typical signs at a glance:

• Airbag warning light staying on permanently or intermittently
• Fault message in the instrument cluster
• Diagnostic tool does not find the control unit
• Fault memory cannot be cleared

In that case, airbags and seatbelt pretensioners may not deploy in an emergency. The warning therefore gives a clear reason to have the system checked.

Which vehicles is the 89170-0DC40 fitted in?

The control unit 89170-0DC40 is fitted in these vehicles: Toyota Yaris XP130 2nd Facelift (2017-2020), XP130 (2010-2014) and XP130 1st Facelift (2014-2017). The assignment is based on the part number that you have read off the unit.

These models are stored in the assignment:

• 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 ensures that it is the correct unit. It is also advisable to have the fault memory read out in advance. Only the result shows whether the control unit itself is defective or whether a connector 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 89170-0DC40 work?

Before you remove the unit, have the fault memory read out and enclose the log; only then disconnect the battery and remove the control unit 89170-0DC40. Finally, create a repair order online, pack the unit and send it in. Processing at Airbag24 normally takes 3–4 working days.

Airbag24 checks the control unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. The repaired unit, which is your own, is then sent back 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 89170-0DC40 get to Airbag24?

Whether you send the control unit 89170-0DC40 yourself as a parcel or have it collected by UPS for an extra charge is up to you. After the repair, it is likewise returned by UPS.

Enclose the printed repair order and make sure the packaging is shock-proof.