Hello and welcome to the forum!
Maybe you have a bad Light Control Module (LCM) it is located under the dash towards the center, or you could have an alternator diode leaking to ground, "Towncar" pointed me to this since I was having lighting problems.
Quote:
Towncar:
Battery drain is common in this car when Alternator diodes leak to ground. Sometimes this condition also causes speedometer wander at idle, and definitely causes all sorts of electronic gremlins.
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You should have it tested at an auto shop, I read somewhere that you could also use a voltmeter between the battery terminals and check for any
AC voltage with the engine running, this should be an indicator of a leaking diode.
Best regards,
Oscar