If the compass is flashing in Your Honda CR-V it usually means that it needs to be calibrated. You will need to follow the calibration procedure that is in Your owner's manual to get it to work again. There are times when the battery is disconnected or the vehicle encounters electromagnetic interference and that can mess up the compass that is in the mirror. This compass works the same as any other compass by using magnetic signals in the Earth to tell You the direction that You are heading. Usually after You change the battery You will need to recalibrate it, but it is a pretty easy process that involves driving in a figure 8.
Gary P.
April 9, 2020
The compass is a part of the console dash for the honda crv, it can cease to function if there is some kind of wiring issue with the car.
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