Airbag control unit with part number 89170-35310

What does the airbag control unit 89170-35310 do?

At Toyota, the airbag control unit 89170-35310 processes the data from the crash sensors and decides in an accident, within milliseconds, on the triggering of airbags and seatbelt pretensioners. It monitors the restraint system (SRS) permanently. After an accident it stores crash data and locks itself.

If the unit detects a fault, it reports it via the airbag warning light. Monitoring runs continuously.

It has nothing to do with the engine, the steering or the brakes.

Why does the control unit 89170-35310 fail?

The most common cause is stored crash data after an accident, even if no airbag fired; a normal diagnostic tool does not erase them. Other causes are aged electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

Crash data arise from the event itself, regardless of whether airbags fire.

Aged components, cold solder joints and moisture are among the general causes of electronic faults.

Voltage spikes act on the unit when the battery is weak or a jump start is given.

How can you tell that the 89170-35310 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently. In addition there is a fault message in the instrument cluster, and the diagnostic tool gets no contact with the control unit. The fault memory also cannot be cleared, so the airbags and seatbelt pretensioners may not fire in an emergency.

The light can perform a self-test when the ignition is switched on. If it stays on afterwards, a fault is stored.

Intermittent lighting is also a finding that you should have checked.

Which vehicles is the 89170-35310 fitted in?

The control unit 89170-35310 was fitted in these vehicles: Toyota 4Runner N280 2nd Facelift (2017-2024), N280 (2009-2013) and N280 1st Facelift (2013-2017).

Below you will see the vehicles that we hold under this number.

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

Compare the number on the label of the removed unit with this page. This ensures that it is the right unit; it says nothing about the cause. Whether the control unit itself is defective or a plug or cable is the cause is clarified by the fault memory. Have it read out first.

How does the repair of the 89170-35310 work?

First have the fault memory read out and attach the log; then disconnect the battery and remove the control unit. Testing, repair and function test at Airbag24 usually take 3–4 working days.

Afterwards create the repair order online and pack the unit well before sending it. Airbag24 then checks the unit on the test bench, replaces defective components, erases the stored crash data and runs a function test.

The sequence of removal applies for safety reasons.

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 89170-35310 get to Airbag24?

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

Enclose the printed repair order and pad the unit shock-proof.