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Horn sounds once when driver side down opens with key not in ignition

Electrical and Electronic

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster S; Year: 2000; Engine (type, size, modifications): standard; Total Mileage: 52000; Transmission: Manual;

When I open the driver side door, the horn sounds once. I already have removed the key from the ignition. It seems the car thinks the key is still there. The lights in the instrument panel does not go off. I have to manual lock the car with key. Is there something wrong with the security system or this could be an issue with the ignition key assembly? What is the best way to diagnose this problem?

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