Hi,
If you are unable to link to a scan tool, check to see if there is power to pin 16 on the DLC. If there isn't check fuse 8 in the under-hood fuse box. (See pics below)
Next, the idea that it drains the battery indicates a short at some point. Disconnect the battery negative terminal. Using a multimeter of a voltmeter, place the red meter wire on the battery cable and the black meter wire on the battery negative. How much voltage is drawn?
At this point, you can remove one fuse at a time to see which one allows the electrical draw to stop. This way we will have narrowed down the circuit involved.
Let me know what you find.
Take care,
Joe
See pics below.
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Sunday, September 17th, 2023 AT 8:56 PM