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There are different ways the touch screen in Your 2018 Honda CR-V can malfunction, and the specific way it malfunctions can give clues to the underlying problem. If the screen isn't showing anything, check if it's black or blue. If it's black, it could be a wiring or head unit problem. If it's blue, it may be a software issue that requires the system to be re-flashed by a dealer. If the screen doesn't respond to touch, there could be damage to the digitizer that may be costly to repair, leading you to consider replacing the head unit. If the issue only happens in cold weather, it's advisable to have a service technician assess the problem.
If the touchscreen is unresponsive in a 2018 Honda CR-V, it's a good idea to inspect the radio fuses.