Buzzing sound

[hmsailor]

So i left my yaris unlocked inside the garage last night. When i was leaving for work this morning, i heard a buzzing sound that came from the rear. I couldnt figure it out so i went ahead and started the car. As soon as i turned the key on the "ON" position, the buzzing sound stopped. Anyone have this experience?

[WeeYari]

Evap canisters/purge valves have been known to emit buzzing sounds on cold unattended vehicles.

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[ern-diz]

Evap canisters/purge valves have been known to emit buzzing sounds on cold unattended vehicles.

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How interesting. Learn something new everyday.

My best guess would have been a bug that stopped when it felt the car start :laugh:

[BLH]

My 2007 owners manual indicates.
The car has a Leak Detection Pump. In the rear end of the car. About five hours after turning the car off. You may hear the pump running during the leak tests and it is normal.

Though maybe not what you where hearing.