This issue is not exactly the same as
Lexus IS220 start button won't turn green help
but it is similar
Behaviour is the same with both key fobs, no problem with keyless entry, but neither key is recognised by the start button in that it does not go green when pressed
Also it does not go green when either fob is brought close to the button, and it does not make any difference if the clutch is pressed
Obviously pressing the button when the LED is not illuminated does nothing, there are no messages on the dash
It is possible to generate some messages on the dash, for instance you can change the Door Unlock Mode from drivers door only, to all doors, and back again, using the fob buttons
It is also possible to access the Intrusion Senson On/Off menu, using the satellite buttons
At no point does the 'Key Not Recognised' message appear
The fob batteries are new, the car battery is fully charged, headlights are bright, systems that work without the car in ACC mode work well and are not sluggish
When the fob buttons are used to unlock the car, the Start button text is illuminated in green, therefore the start button is powered, however the LED is never illuminated
Neither fob have been water damaged or dropped, so it seems that whatever links the keys to the ignition has somehow failed, because the keyless entry works fine
I have seen the "POWER SOURCE CONTROL MODULE MPX PSC 89670-53120" mentioned on a US forum, is that module coded or is it a straight swap? It sounds extremely difficult to reach though...
Because of where the car is parked, and because of the electronic steering lock, I doubt it would be possible to get to car towed
What are my options, bearing in mind that the car is worth no more than a grand, and my parents want to sell the car anyway?