Airbag control unit with part number 89170-74080

What does the airbag control unit 89170-74080 do?

The airbag control unit 89170-74080 coordinates the restraint system (SRS) of Toyota, evaluates the crash sensors and triggers airbags and seatbelt pretensioners in an accident. It checks the system continuously and reports faults via the airbag warning light.

The decision is made within milliseconds, and monitoring stays permanently active during operation.

After an accident the unit stores crash data and locks itself.

Why does the control unit 89170-74080 fail?

Crash data stored in the unit after an accident cause the failure most often, even if no airbag was triggered. Such data cannot be removed with a usual diagnostic tool. Other causes are ageing components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

From the outside, the data cannot be seen, which is why they are easily overlooked in fault finding. They remain in the memory even when the vehicle keeps running.

Ageing components and solder joints that have gone cold lose their reliability. Moisture and corrosion on plug connections additionally disrupt the contact.

Voltage spikes occur, for example, with a weak battery or jump-starting. Such fluctuations stress the control unit.

How can you tell that the 89170-74080 is defective?

The airbag warning light in the instrument cluster is the main sign: it lights up permanently or intermittently. A fault also shows as a message in the instrument cluster, a failed connection setup with the diagnostic tool, or a fault memory that cannot be cleared. Airbags and seatbelt pretensioners may then not be able to trigger in an emergency.

• Airbag warning light stays on permanently
• Airbag warning light comes on intermittently
• Message in the instrument cluster
• No connection to the diagnostic tool
• Fault memory cannot be cleared

Do not leave the light unchecked. A workshop or a diagnostic tool helps to classify the finding.

Which vehicles is the 89170-74080 fitted in?

These vehicles include the 89170-74080: Toyota iQ KGJ10 (2008-2015).

The list of vehicles follows below.

• Toyota iQ KGJ10 (2008-2015)

Checking the part number on the label of the removed control unit ensures that it is the correct unit. Have the fault memory read out beforehand, because only the log shows whether the control unit itself is defective or whether cables and plugs are the cause.

For the same vehicles, we also repair control units with the part numbers 150300-2193, 89170-74020, 89170-74140.

How does the repair of the 89170-74080 work?

Have the fault memory read out first and enclose the log, then disconnect the battery and only then remove the control unit. Next, create a repair order online and send in the well-packed unit. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 inspects the unit on the test bench and repairs defective components. Stored crash data are erased, and a function test concludes the work.

The unit then goes 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 89170-74080 get to Airbag24?

The unit goes to Airbag24 either as a parcel or, for an extra charge, you book a UPS collection. After the repair, UPS returns the unit to you.

Enclose the printed repair order with the unit and pack it shockproof.