I just asked a slightly similar question in the Corolla forum. My 2010 Corolla has electric folding mirrors that can be folded by pushing a recessed switch, which isn't easy to find unless you look for it. Unless your car park has good lighting, this switch is hard to see at night. It is a flat rectangle flush with the panel and is as wide as my pinky, so not exactly positioned to be used often. Many overseas cars fold back the mirror housing when switched off, as this also allows people to walk past without bumping them. (The idea of a visual confirmation of locking is also good). While I am not an electrician, my amateur radio background tells me that a simple relay would do the job of pushing that button when the car is switched off. For anyone who doesn't know what a relay does, think of an electromagnet that pulls a lever to complete a circuit. You can have a relay that only makes the circuit while you hold down a button (power it), or the opposite, where the circuit is always on until you power the relay - like a garage door toggle switch. But I don't know enough to say whether the Toyotas can do this. Toyota's product managers would have made a conscious decision not to supply this, perhaps to save a buck, or perhaps to make it a future option. I found a random relay here: Alibaba - explore for your particular model.