Hello Terry, use an amp clamp on battery close bonnet do not disconnect battery (don't squash amp clamp.) lock car to set security system and take readings. Not sure if this car has a sleep mode. Depending on current draw you may have to start pulling fuses to isolate problem. I use the snap-on modis scope and clamp when doing this but there are other tools out there to do this.. Thinking on the battery is in the boot on these so close that instead!!