Airbag control unit with part number 89170-35370

What does the airbag control unit 89170-35370 do?

The airbag control unit 89170-35370 controls the restraint system (SRS) of Toyota. It evaluates the signals from the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and reports faults via the airbag warning light.

While driving, the unit checks the connections to sensors and actuators constantly. If it detects a deviation, it stores it in the fault memory so that the fault can be read out later.

After an accident the control unit stores crash data and locks itself. This lock is the unit's reaction to the accident and not a fault that could be cleared via the instrument cluster.

Why does the control unit 89170-35370 fail?

The most common cause is crash data stored after an accident, even if no airbag has deployed; a normal diagnostic tool cannot delete it. Other possible causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes.

Crash data remains in the memory of the unit until it is read out or deleted. A diagnostic tool from the workshop cannot reach this entry, so after an accident you should expect a fault that cannot simply be reset.

Ageing components and cold solder joints can interrupt contacts. Moisture and corrosion at plug connections create transition resistances that distort the signals. Voltage spikes, for example with a weak battery or when connecting a jump start, stress the electronics.

How can you tell that the 89170-35370 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears, the diagnostic tool finds no connection to the control unit, and the fault memory cannot be cleared. In this case airbags and seatbelt pretensioners may not deploy in an emergency.

• Airbag warning light in the instrument cluster stays on permanently
• Airbag warning light comes on only intermittently
• Fault message in the instrument cluster
• Diagnostic tool cannot establish a connection to the control unit
• Fault memory cannot be cleared

The warning light is the warning the unit itself triggers. Anyone who ignores it loses valuable time, because the cause remains even if the light goes out again for a while.

Which vehicles is the 89170-35370 fitted in?

The 89170-35370 is fitted in these vehicles: Toyota FJ Cruiser GSJ15 (2006-2022).

The list shows the vehicles that are stored for this part number.

• Toyota FJ Cruiser GSJ15 (2006-2022)

Compare the part number on the label of the removed unit with this page first, which only confirms that you have the correct unit. Also have the fault memory read out beforehand, because the result shows whether the control unit is defective or whether a plug or cable is causing the fault.

For the same vehicles, we also repair control units with the part numbers 89170-35300, 89170-35320, 89170-35380, 89170-35470.

How does the repair of the 89170-35370 work?

Before removal, have the fault memory read out and enclose the log. Disconnect the battery before you remove the control unit. Then create a repair order online and send the unit in well packed. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and replaces defective components. The stored crash data is deleted, then a functional test is carried out. Afterwards your own unit is returned to you.

The order is a safety measure, because the control unit may only be handled after the battery has been disconnected. 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 89170-35370 get to Airbag24?

You send the unit in as a parcel or book UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Enclose the printed repair order in the parcel and pack the unit shock-resistant.