XC90 2.5T AWD L5-2.5L Turbo VIN 59 B5254T2 (2003)
the control module disconnected
Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).
Connect an ohmmeter between terminal #16 on the breakout box and the battery negative terminal.
To connect the breakout box, see Connecting the breakout box See: Pinout Values and Diagnostic Parameters/Connecting the Breakout Box.