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Auto power on of car subwoofer working?

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jaya000

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Herewith attached the automatic power on circuit of an car audio. It is used as auto power on when there is audio input. Audio amplifier starts working after some time of audio signal input.
When there is no signal for 30 seconds it becomes automatically off.

This circuit is not becoming off after 30 seconds. many times it is on for long hours in car even when audio signal is not present. Kindly explain me how to modify or remove this problem. So please guide about working of this circuit.
 

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    auto power on.jpg
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Its leakage through D12 and /or D10*, thats your problem, either get an ultra low leakage types or reduce the 1M ohm. The leakage current through these diodes are keeping the voltage up on the cap.
* can't see the purpose of D10.
Frank
 

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