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as the outside temp. fell below 20, two things happened: "menu" and "map" buttons on remote controller became very "stiff", and required increased pressure to work...
another issue: low-tone horn stopped working, then came back after RX warmed up, then stopped working again...
I wonder if these are known issues, I did make an appointment w/ dealer...
I live in Toronto and we've had pretty chilly weather the last couple of days, as you already know. Thankfully, none of those issues manifested in my '10 RX350. For the horn, i know for sure it was working as I had to use it on a cab driver on Tuesday night who decided to come up with his own set of driving rules.
Hope your issues get resolved at the dealer. Cheers!