How do you reset the service lights on 2004 BMW Series 5 330TDi

You should not have the 20-pin DLC connector in your car so you only need to hold the left odometer reset button while turning the ignition key to position 1 (Accessory). Keep holding the button for 5 or so seconds until any of the following shows in the display: OIL SERVICE or INSPECTION with RESET or RE. Release the button and press it again for another 5 or so seconds until RESET or RE flash. While the display flashes, press the button one more time briefly. If done correctly, END SIA should show up for a few seconds.
This should sort your problem!