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Old 09-25-2016, 10:56 AM   #1
Drives: Yaris XP9 1.3 '06
Join Date: May 2016
Location: -
Posts: 33
Rear parking sensors keep beeping when nothing is behind car


My '06 Yaris (Europe) has 4 parkingsensors in the rear bumper. When i switch to reverse gear (stick, not automatic transmission) it will give a beep, then as the car gets closer to a wall or something, the time between beeps will get shorter, untill a solid beeeeeeep when car is reaaally close to a object.

However, since a few days ago, it sometimes constantly beeps (solid beep) even when the area behind the car is clear.

I have cleaned the sensors with a soft rag, but they weren't dirty.

Does anyone know if the car was fitted with this system from factory, or is it a aftermarket set?

What steps could i take to find/resolve the culprit of this?
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Old 09-25-2016, 02:24 PM   #2
Drives: 2009 5-door, 5-speed
Join Date: Sep 2011
Location: White Rock BC
Posts: 687
Not sure if Yaris ever got them from factory, but they may have been dealer installed. Factory ones are easily diagnosed with a scanner as you can see what each sensor is reading. With aftermarket it may be a little tougher, but you may be able to unplug one at a time and see if the beeping stops. Note that it may disable the system completely with any one unplugged.
If that doesn't work, you will probably have to use a multimeter and compare the resistance of each sensor.
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Old 09-25-2016, 02:31 PM   #3
Drives: Yaris XP9 1.3 '06
Join Date: May 2016
Location: -
Posts: 33
I will have a look and see if i can trae the wires, it should end up in a module somewhere in the trunk i guess.
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Old 09-25-2016, 08:18 PM   #4
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Drives: 09 5dr LB, 2x 08 3dr LB
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Location: USA, CT
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For the MK2 Yaris, the parking sensors were a genuine Toyota accessory, but they are not connected to the car's network for diagnostics.

Here is the Toyota troubleshooting guide for the system:
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Old 09-25-2016, 09:07 PM   #5
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Drives: 2009 Base Hatch 2 Dr Auto
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Location: nj
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Im not surprised they broke.

Such is the fate of all such things....
Synthetic Oil: Its All In Your Head
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Old 09-26-2016, 06:33 AM   #6
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Drives: 2012 Toyota Yaris Sedan (Vios)
Join Date: Dec 2015
Location: Thailand
Posts: 291
i had mine for 4 years...mines having same issue as yours...i think sh*ts getting old...😣

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