have just bought a ls400 and left it stood for 3 weeks while away on holiday, on return the battery is completely flat and all that happens now after replacement is the dash lights and ignition lights come on but will not start. thought it might be the gear selection isolator but all seems well and the 4 way flashers keep flashing while i am trying to start the car. have lost the code on the radio so assuming there is some sort of recoding required? can u help me please??

It sounds like this could have something to do with fuel cutoff.. Check your manual real quick...

SORTED!!!!! The alarm was fitted at port of entry and contain an ecu that is now unavailable. by passed the alarm immbilisor and it goes!!!!

Thank you for the update! I'm glad you got it worked out...