Airbag control unit with part number 89170-35220

What does the airbag control unit 89170-35220 do?

The airbag control unit 89170-35220 controls the restraint system (SRS) in Toyota. It evaluates signals from the impact sensors, decides within milliseconds in an accident on airbags and seatbelt pretensioners, and monitors the system without pause. It indicates faults via the airbag warning light.

This monitoring runs with the ignition and stays active even when the vehicle is stationary.

If an accident happens, it secures crash data and locks itself.

Why does the control unit 89170-35220 fail?

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

Crash data is the first place to look when the unit disturbs operation without an obvious reason.

Electronics age, solder joints can develop hairline cracks, and moisture seeps into plug connections. Voltage spikes arise, for example, from a weak battery or a jump start, and additionally load the components.

How can you tell that the 89170-35220 is defective?

A defect shows up as the airbag warning light, when it stays on permanently or intermittently, and as an error message in the instrument cluster. The diagnostic tool cannot find the control unit, and the fault memory remains occupied. In this case, airbags and seatbelt pretensioners may fail to trigger in an emergency.

• Airbag warning light permanently on
• Airbag warning light on intermittently
• Error message in the instrument cluster
• Missing connection between diagnostic tool and control unit
• Fault memory cannot be cleared

Take such indications seriously, even if the vehicle otherwise drives normally. The light is the direct feedback from the system.

Which vehicles is the 89170-35220 fitted in?

The airbag control unit 89170-35220 is fitted in these vehicles: Toyota 4Runner N210 (2002-2005) and N210 Facelift (2005-2009).

The overview names the vehicles known to us for this control unit.

• Toyota 4Runner N210 (2002-2005)
• Toyota 4Runner N210 Facelift (2005-2009)

Compare the part number on the label of the removed unit with this page; this only shows whether it is the correct unit. Have the fault memory read out beforehand, because only the result shows whether the control unit is defective or a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 89170-35210.

How does the repair of the 89170-35220 work?

First read out the fault memory and attach the log to the unit. Then disconnect the battery, remove the control unit and create a repair order online. Processing at Airbag24 usually takes 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes the crash data and tests the function. 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 89170-35220 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. The printed repair order goes into the parcel, and the unit must be packed shockproof.

Make sure nothing shifts in the carton.