I hear a "chime" coming from under the steering wheel, up under the dash?

I have an 85 325e and in the past two years that I,ve owned it, occasionally I hear a "chime" coming from under the steering wheel, up under the dash. Recently, the last month or so I hear the chime at least twice a week. I have researched it and no-one seems to know why. Any ideas what is causing this? Ty

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[Kerry at Pelican Parts]

Probably the key in ignition sensor or the door open switch

- Kerry