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High pitch buzz is always there when system is charging. It is loader when brake pedal is applied.

I discovered a new noise at around 400 miles mark. The noise is coming from under the driver's side dashboard and occurs only when brake pedal is applied under 20mph or near stop speeds. The noise is intermittent and reminds of an electric servo opening/closing something, similar to a noise when climate control damper is changing the airflow direction. Lexus service says this noise is normal but I want an explanation on why that noise is occurring and why it was not there when we 1st bought the car. Once I get a more scientific explanation from Lexus service, I will share the info.

On a side note, few days after I noticed that noise the gas engine started on its own while car was parked in the garage. Good think I heard the gas engine running and rushed to the garage to turn off the engine. When I got to the car there was a triangle warning sign flashing on a dash board, navigation screen was poped up with energy screen showing nearly empty battery with only one bar. Both sets of keys were nowhere near the car. I dropped the car off to service department the same day. On the way to serivce department the battery fully charged and lexus did not find any issues with the hybrid system including the battery. To the best of my memory when car was parked in the garage the power was turned off. Now I do not feel comfortable parking the car in the garage because gas engine may decide to start up on its own. I will pursue an explanation from Lexus under what conditions the gas engine may start up on its own when key is outside of the car.
 

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Update: an intermittent noise coming from driver's side under the dashboard is an electric motor that builds up pressure in the brake booster system. Since the gas engine is not always running, vacuum needed for the brake booster system is not always available.
Lexus service master technician confirmed that gas engine will not start under any circumstances unless car was not powered off. We must have forgotten to hit the power off button when we parked the car, so, once battery level dropped to certain level gas engine kicked in. Perfect explanation and it makes sense. I was able to replicate the issue with a note that once I left the car, it made three tones which was an indication the car was still powered on and key was not detected. Got to be more careful in the future. This hybrid and keyless start is soo new to us.
 
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