Out of 2003 owners manual.
Electrochromic Mirror Operation
The electrochromic (self-dimming) mirror function is
turned on automatically each time the ignition is started.
To operate the electrochromic mirror do the following:
1. Make sure the green indicator light, located to the
left of the COMP button, is lit. If it’s not, press and
hold the TEMP button for six seconds until the
green light comes on, indicating that the mirror is
in electrochromic (self-dimming) mode.
2. Turn off the electrochromic mirror function by
pressing and holding the TEMP button for six
seconds until the green indicator light turns off.