Headlights come on and relay buzzes

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Got an intermittent but frequent problem with my IS200

The headlights come on and the relay box by the Battery buzzes, even with no key in the ignition

Only way to stop it is disconnect the Battery

Don't get buzzing when lights are switched on

Had a couple of auto electricians look at it without success

Relay changed  - no effect, no water in relay or fuse area, steering column switch seems ok

Any suggestions welcome

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