Reverse Shift-linked Function of Power Mirrors does not Operate: Description
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
After the ECM receives a reverse signal from the park/neutral position switch, the ECM sends a reverse signal to the outer mirror control ECU via the CAN and BEAN communication systems The outer mirror control ECU activates the mirror motor in response to the reverse signal
NOTE:
The reverse shift linked unction of the power mirrors will not operate when the mirror select switch is in the neutral position (between "L" and "R").