Airbag control unit with part number 89170-0D040

What does the airbag control unit 89170-0D040 do?

The airbag control unit 89170-0D040 is the central switching point of the restraint system (SRS) at Toyota. It reads the crash sensors, determines within milliseconds in an accident which airbags and seatbelt pretensioners trigger, and checks the system continuously. Faults are indicated via the airbag warning light.

All sensors and triggering devices are connected to this electronics. After an accident, it stores crash data, after which the unit remains locked.

Why does the control unit 89170-0D040 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a diagnostic tool cannot erase it. Further causes include aged components, cold solder joints, moisture and corrosion at plugs, and voltage spikes.

The crash data persists in memory until it is specifically dealt with. The other causes build up gradually before a fault becomes visible.

How can you tell that the 89170-0D040 is defective?

The airbag warning light in the instrument cluster burns permanently or intermittently. Added to this may be an error message, a diagnostic tool without contact to the control unit, and a fault memory that cannot be emptied.

This warning concerns the entire restraint system and should be investigated promptly. In an emergency, airbags and seatbelt pretensioners may not deploy.

Which vehicles is the 89170-0D040 fitted in?

This unit belongs to certain models at Toyota. The control unit 89170-0D040 is fitted in these vehicles: Toyota Yaris XP10 (1998-2003).

The models equipped with it are listed here:

• Toyota Yaris XP10 (1998-2003)

Comparing the part number on the label of the removed unit with this page ensures that the correct unit has been removed. Reading out the fault memory before you remove anything provides the answer as to whether the control unit is faulty or whether a wire and a plug are the cause.

For the same vehicles, we also repair control units with the part numbers 2310002470, 89170-0D020, 89170-52040, 89170-52070, 89170-52140, 89170-52780.

How does the repair of the 89170-0D040 work?

First have the fault memory read out; the log goes with the unit. Then disconnect the battery, remove the control unit, create a repair order online and pack it well.

At Airbag24, the team examines the unit on the test bench, repairs defective components, removes the crash data and carries out a function check. Processing there usually takes 3–4 working days; afterwards, your own unit returns 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 89170-0D040 get to Airbag24?

Either you send the unit as a parcel, or you book UPS collection for an extra charge. After repair it is sent back by UPS.

A printed repair order goes into the parcel, and you pack the unit shockproof.