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The lights could be on for 2 reasons.

1. The battery became low and the LCM (Light Control Module) was unable to handle the drop in battery Voltage and the logic became stupid and commanded some of the lights on.

2. The LCM, which is part of the headlight switch, got wet and the logic became stupid and commanded some of the lights on.

OR possibly a combination of 1 & 2 above.

Suggest you pull the LCM, also some of the E46 fires when parked have been due to the LCM possibly getting wet/corroded.

Search E46 fires on the forum here, there are quite a few.

Once the LCM is removed, you may want to consider a replacement or at least see if you can ope it and inspect the circuitry very carefully for damage and overheating.
 
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