Seems a bit of an odd one to me, but here goes... I have a 2006 IS250 SE, without NAV, it has physical sensors in the rear bumper, (none in the front), but the car doesn’t beep when selecting reverse, or when reversing towards an object (even a solid wall), and I’ve never seen the green parking assist light on the dash. There’s the correct fuse in the passenger footwell fuse box, and it’s not blown. I’ve read about a ‘switch’ in the boot to turn it off if you’re towing a trailer, but can’t find any sign of one (unless it’s hidden under a trim panel), and there’s no sign of it ever having a tow bar fitted. Anyone got any thoughts on what’s going on, or know if it’s something that a dealer could have turned off? (If so, could I buy tech stream & turn it back on?) Thanks in advance!