HELP ANY ONE! Just got 2001 Jaguar XJ8 Vandan plas with less than 122k miles. Loving it.. only problem is my audio is stuck on phone and won't switch to tape or CD only navigation and it's not going off even thou the car is ofg and lock! Over night the battery will die.

 

Try doing a hard reset of the battery, and see if that'll reset it to clear back to normal.

 

How do you do a hard reset on the battery?

 

https://www.jaguarforums.com/forum/x...d-reset-38112/

Good read, but the short version is unhook the battery, and touch the leads together (+ and -) for about 20 seconds or so.