Airbag control unit with part number 89170-52090

What does the airbag control unit 89170-52090 do?

The airbag control unit 89170-52090 is the control unit of the SRS restraint system in Toyota. It evaluates crash sensors, determines in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously.

It detects faults itself and displays them via the airbag warning light. Monitoring also covers the connections to the triggers.

After an accident it stores crash data and locks itself.

Why does the control unit 89170-52090 fail?

The most common cause is crash data stored after an accident, even without a deployed airbag; a normal diagnostic tool cannot erase it. Other causes are aged electronics, cold solder joints, and moisture and corrosion at plug connections.

Further causes at a glance:

• Aged electronic components
• Cold solder joints
• Moisture and corrosion at plug connections
• Voltage spikes, for example from a weak battery or jump-starting

The list names starting points. Only the test shows which cause is actually present.

How can you tell that the 89170-52090 is defective?

An airbag warning light in the instrument cluster that stays on permanently or comes on intermittently is the first warning sign. Add to that an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared. In this state, airbags and seatbelt pretensioners may fail to deploy in an emergency.

These signs are typical:

• The warning light does not go out after switching on
• The instrument cluster shows a fault message
• The diagnostic tool cannot reach the control unit
• The fault memory cannot be emptied

Such a finding calls for a test.

Which vehicles is the 89170-52090 fitted in?

The airbag control unit 89170-52090 is fitted in these vehicles: Toyota Yaris XP10 Facelift (2003-2006) and XP10 (1998-2003).

The vehicles are listed individually.

• Toyota Yaris XP10 Facelift (2003-2006)
• Toyota Yaris XP10 (1998-2003)

Comparing the part number on the label of the removed unit with this page only confirms that you have the right unit in front of you. Have the fault memory read out alongside it, because only the result 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 2310002470, 89170-0D010, 89170-0D020, 89170-0D040, 89170-0D090, 89170-0D100.

How does the repair of the 89170-52090 work?

First have the fault memory read out and attach the log, then disconnect the battery and only then remove the control unit. Online you create a repair order, then send the unit in well packed. Airbag24 tests it on the test bench, replaces defective components, erases stored crash data and runs a function test before your own unit is sent back.

Processing at Airbag24 usually takes 3–4 working days. This figure describes only the work there.

The order serves safety. 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 89170-52090 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge. After the repair Airbag24 returns it to you by UPS. Put the printed repair order into the parcel and pad the control unit shock-proof.

Good padding protects the unit on both routes.