Airbag control unit with part number 89170-35480

What does the airbag control unit 89170-35480 do?

The airbag control unit 89170-35480 is the central control unit of the SRS restraint system in vehicles from Toyota. It evaluates the crash sensors, decides in an accident within milliseconds whether airbags and seatbelt pretensioners are triggered, and monitors the system continuously. After an accident it stores crash data and locks itself.

The airbag warning light in the instrument cluster shows faults as soon as the unit detects them. It connects the sensors to the triggers and checks both for faults.

The crash data record what the unit registered during the accident. They concern the control unit itself.

Why does the control unit 89170-35480 fail?

The most common cause for control unit 89170-35480 is that crash data were stored after an accident, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

A normal diagnostic tool cannot erase crash data. Airbag24 erases them during the repair, so no entries remain afterwards.

The other causes affect the electronics and their connections. Moisture and corrosion impair plug connections, cold solder joints and aged components weaken the function, and voltage spikes, for example from a weak battery or jump-starting, additionally stress the electronics.

How can you tell that the 89170-35480 is defective?

You recognise a defect in the 89170-35480 by the airbag warning light in the instrument cluster, which lights up permanently or intermittently. In addition there is 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 cleared.

As long as the warning light displays the fault, airbags and seatbelt pretensioners may not be able to deploy in an emergency. The notice is therefore a prompt to have the fault checked.

Which vehicles is the 89170-35480 fitted in?

The papers in the vehicle registration document show whether your car is included. The airbag control unit 89170-35480 is fitted in these vehicles: Toyota 4Runner N280 2nd Facelift (2017-2024), N280 (2009-2013) and N280 1st Facelift (2013-2017).

The list below names the vehicles that we know of for this part number.

• Toyota 4Runner N280 2nd Facelift (2017-2024)
• Toyota 4Runner N280 (2009-2013)
• Toyota 4Runner N280 1st Facelift (2013-2017)

Matching the part number on the label of the removed unit with this page only confirms that you have the right unit. Have the fault memory read out beforehand, because only this result shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 89170-35480 work?

First have the fault memory read out, then disconnect the battery and only then remove control unit 89170-35480. Next create a repair order online and send the well-packed unit in. At Airbag24 processing usually takes 3–4 working days.

Airbag24 checks the unit on the test bench and repairs defective components. The stored crash data are then erased, and a function test concludes the work. Afterwards your own unit is returned 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 89170-35480 get to Airbag24?

Either you hand in control unit 89170-35480 as a parcel, or you book a UPS collection for an extra charge. The unit is returned to you by UPS after the repair.

Place the printed repair order in the parcel and pad the unit so that it lies shockproof.