This indicates that the illumination line is wired incorrectly or the internal bulb circuit has failed. Check that on the main harness is receiving power only when your vehicle's headlights are switched to the "On" position. How to Access Official Toyota Manuals
The faceplate is designed for straightforward layout interaction while driving: toyota pz071-00a02 manual
: Positive terminal for rear left speaker. This indicates that the illumination line is wired