Airbag control unit with part number 89170-BZ590

What does the airbag control unit 89170-BZ590 do?

The airbag control unit 89170-BZ590 is the central control unit of the restraint system (SRS) for Daihatsu. In an accident it evaluates the signals from the crash sensors and decides within milliseconds whether airbags and seatbelt pretensioners are triggered. It reports faults via the airbag warning light.

The system is in operation continuously. The unit monitors the sensors, the firing circuits and the control of the seatbelt pretensioners, so that the right components react in an emergency.

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

Why does the control unit 89170-BZ590 fail?

The most common cause is stored crash data after an accident, even without an airbag being triggered. Ageing components, moisture at plugs and voltage spikes are also possible causes.

• Crash data: cannot be deleted with a standard diagnostic tool.
• Ageing electronic components and cold solder joints.
• Moisture and corrosion at plug connections.
• Voltage spikes, for example from a weak battery or jump-starting.

Airbag24 deletes the crash data during the repair. The other causes concern the electronics and the contacts of the unit and may only show up after a longer period.

How can you tell that the 89170-BZ590 is defective?

The airbag warning light lights up permanently or intermittently, and a fault message appears in the instrument cluster. Airbags and seatbelt pretensioners may then not trigger in an emergency.

• The diagnostic tool gets no connection to the control unit.
• The fault memory cannot be cleared.

The warning light indicates the defect, so it is the most important signal. Anyone who ignores the display forgoes the safety the system is meant to provide. However, the light cannot name a specific cause.

Which vehicles is the 89170-BZ590 fitted in?

The control unit 89170-BZ590 is fitted in these vehicles: Daihatsu Luxio F600 (from 2009).

The following assignment shows the models for which this part number is recorded:

• Daihatsu Luxio F600 (from 2009)

First compare the part number on the label of the removed unit with this page. This only establishes that you have the correct unit in front of you. Also have the fault memory read out before you remove the control unit. Only the log shows whether the control unit itself is defective or whether a plug or cable is the cause.

How does the repair of the 89170-BZ590 work?

First read out the fault memory and enclose the log. Then disconnect the battery and only then remove the control unit. Next create a repair order online and send the well-packed unit.

Airbag24 tests the unit on the test bench and replaces defective components. Then the team deletes the stored crash data and carries out a function test. Your own unit is returned to you afterwards. At Airbag24, testing, repairing and checking usually take 3–4 working days.

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-BZ590 get to Airbag24?

Either you send the unit as a parcel, or you book a UPS collection for an extra charge. After the repair Airbag24 returns the unit to you by UPS.

Enclose the printed repair order with the parcel, and pack the control unit shock-proof.