Originally Posted by Technic
If your battery is in good charge condition then just push the volume knob on the radio and it will turn on without any key anywhere, the car running or in ACC. It will stay on until the car ECU detects a battery low charge or for around 20-25 minutes, whichever happens first.
Yes, I believe it's that 20-25 minute wall that we are hitting and seeking a means to avoid. At least that's what it is in my case.
Surely the OP and I cannot be the only folks old enough to remember cars where you just turn the key in the direction opposite that which starts the car to turn on just the radio (no fans, no lights, etc....) and the radio would stay on until you turned the key the other way or the battery ran out??? You might think of it as "drive in movie" mode.