Airbag control unit with part number 89170-0A100

What does the airbag control unit 89170-0A100 do?

The airbag control unit 89170-0A100 controls the restraint system (SRS) in the vehicle from Toyota. In a collision it processes the measured values from the crash sensors and triggers the appropriate airbags and seatbelt pretensioners.

The decision is made within milliseconds. Between events, the control unit monitors the entire system continuously.

It shows faults in the restraint system via the airbag warning light, which sits in the instrument cluster. If an accident has occurred, it stores crash data and locks itself. The lock is lifted only by the repair.

Why does the control unit 89170-0A100 fail?

The most common cause is a stored crash record from the 89170-0A100, which stays in memory after an accident even if no airbag has triggered. A usual diagnostic tool does not remove it. Other causes are components that age over time, cold solder joints, moisture and corrosion on plugs, and voltage spikes.

The other causes are mainly:

• ageing electronic components
• cold solder joints on the circuit board
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

Crash data is therefore not the only explanation, just the most common trigger. Airbag24 removes it during the repair.

How can you tell that the 89170-0A100 is defective?

The airbag warning light in the instrument cluster shows a defect in the 89170-0A100 by lighting up continuously or only intermittently. In addition there may be a fault message in the instrument cluster, a missing connection between the diagnostic tool and the control unit, and a fault memory that cannot be erased.

The display in the instrument cluster is the clearest indication of a problem in the restraint system.

If the diagnostic tool does not connect to the control unit at all, the cause lies either in the unit or in the line to the diagnostic tool. A fault memory that cannot be emptied even after an attempt to erase it also points to the electronics.

While the warning is active, airbags and seatbelt pretensioners may not be able to trigger in an emergency. A prompt check is therefore advisable.

Which vehicles is the 89170-0A100 fitted in?

The assignment on this page shows in which models the control unit 89170-0A100 occurs. It is fitted in these vehicles: Toyota Corolla Cross XG10 (from 2022).

The following models are assigned to this part number:

• Toyota Corolla Cross XG10 (from 2022)

Compare the number on the label of the removed control unit with the information on this page. This way you make sure it is the right unit. Whether the control unit is actually defective is not yet established by this. To find out, first read out the fault memory, as it also shows whether a plug or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-0A140, 89170-0A210.

How does the repair of the 89170-0A100 work?

First have the fault memory read out, then disconnect the battery and remove the control unit 89170-0A100 only afterwards. Then create a repair order online and send the unit in well packed. At Airbag24 the processing usually takes 3–4 working days.

At Airbag24 the submitted unit is checked on the test bench. The workshop replaces defective components, the stored crash data is erased, and a functional test completes the work.

Afterwards your own unit is sent back to the sender.

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 89170-0A100 get to Airbag24?

You send the control unit 89170-0A100 as a parcel, or have it collected by UPS for an extra charge. Airbag24 then sends the repaired unit back by UPS.

The printed repair order goes into the parcel. Pack the control unit shock-proof so it is not damaged in transit.