Airbag control unit with part number 89170-35430

What does the airbag control unit 89170-35430 do?

The control unit 89170-35430 forms the control centre of the restraint system (SRS) in the vehicle of Toyota. It processes the signals from the crash sensors, determines within fractions of a second in an accident which restraint devices to trigger, and monitors the system continuously. It reports faults via the airbag warning light.

The unit operates independently of driving and logs irregularities in the fault memory. This memory is the basis of every later diagnosis.

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

Why does the control unit 89170-35430 fail?

The most common cause in the 89170-35430 is stored crash data from an earlier accident, even when no airbag has fired. A normal diagnostic tool cannot remove this data. Other causes include aged components, cold solder joints, corrosion at plug connectors, moisture and voltage spikes from a weak battery or a jump-start.

The causes cannot always be pinned down to a single feature. Aged electronics gradually lose stability, solder joints can come loose, and moisture or corrosion alter the transition at the plugs.

The fault memory therefore forms the starting point of every search.

How can you tell that the 89170-35430 is defective?

A defect in the 89170-35430 first makes itself known through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. It is accompanied by a fault message in the instrument cluster, and the diagnostic tool gets no connection to the control unit. In that case the airbags and seatbelt pretensioners may not deploy in an emergency.

A fault memory that cannot be cleared, even when the light goes out in between, is also conspicuous. Anyone who notices these signs should have the fault memory read out promptly.

The fault memory shows more precisely which area of the system is affected, whereas the light only supplies the signal.

Which vehicles is the 89170-35430 fitted in?

The part number matters, not the designation on the vehicle. The control unit 89170-35430 is fitted in the following vehicles: Toyota FJ Cruiser GSJ15 (2006-2022).

The list shows the vehicles for which this part number is stored.

• Toyota FJ Cruiser GSJ15 (2006-2022)

Matching the number on the label of the removed unit with this page only tells you that it is the right unit. Whether the control unit is defective or a plug is behind it is clarified by the fault memory read out beforehand. Therefore have it read out first.

For the same vehicles, we also repair control units with the part numbers 89170-35230, 89170-35270, 89170-35280, 89170-35290, 89170-35300, 89170-35320.

How does the repair of the 89170-35430 work?

Have the fault memory read out first and attach the log to the repair order. Only then disconnect the battery and remove the unit. Afterwards create the repair order online and send the control unit 89170-35430 in.

You have the fault memory read out before anything on the vehicle is changed. Only after reading out may the battery be disconnected. You then remove the control unit and pack it well.

At Airbag24 the unit is examined on the test bench, defective components are replaced, stored crash data is erased and a function test is carried out. Processing at Airbag24 usually takes 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 89170-35430 get to Airbag24?

You send the unit as a parcel or book a UPS collection for an extra charge, and after the repair Airbag24 returns it by UPS. The printed repair order goes in the parcel; pack the control unit 89170-35430 shock-resistantly.

A box with padding material prevents the unit from being damaged on the way.