Auto dimming mirror




Put a small piece of black tape over the sensor on the mirror so it will not see the light. This is silly but without the switch there is no other way (other than if you somehow disconnect the power to the dimming function).
I think this also disables the dimming function of the driver side outside mirror.




The rear window shade disables the automatic mirror dimmer due to blocking the light coming from cars behind. The OP has the light ON inside the car so this does not help.
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