Nothing to reset except radio presets and clock.
you dont
How do I reset oil indicator on bmw 325 1987?
trunk
reset service engine light on BMW 325
In the trunk
12v
do you have to reset computer after changing battery in 2003 745li
You do not have to reset the computer.
In the Boot! right hand side...
Unfortunately a 1986 BMW 325 does not have a service light reset button. To reset the light a user can ground pin 7 in the diagnostic connector. Doing so automatically sends a signal to the cars ECU to reset all error codes and service lights.
Your battery is in the trunk most likely, on the passengers side underneath your small tool carrier.
try looking in the trunk for the battery that's where BMW puts then sometimes. look behind the side panels or under trunk floor