Hows the form folks, im new to the forum but not new to Lexus or Toyota :)
Anywho i am having a similar issue where by my car battery did run dead flat (9.3VDC) and she wouldn't even take a charge so i tested with a new battery from my workshop and all the dash lights came on OK etc i could use the electric windows, wipers, and the green LED would light as i depressed the clutch pedal, but when i attempted to start by pressing the start button the vehicle would do nothing.... wouldn't even turn over, it is flashing that the boot lid is open when it isn't and showing engine warning light and battery light.... any ideas guys??
Ps... this has only happened when my wife parked the car overnight on the hill outside our home and it got really cold very quickly around minus 2 Celsius , wether that has made a difference or not i am not sure.