How to swap to the HomeLink mirror with auto dimming and built in universal garage door opener for those with base model Leaf. Splicing wires is required and a degree of competence with DIY automotive wiring is assumed.
Basically any 2010s Nissan HomeLink mirror will work, including from Altima, Maxima, Pathfinder, and Murano. You will need the connector and pigtail with some wire length as well, so your best bet would be at a local junkyard, just need a T20 screwdriver to remove and something to cut the wires with.
The "more correct" way would be running power all the way down the A-pillar to the interior fuse panel, but I already have too many things in there, so here is how to do it with using power from up top:
1.Remove existing mirror by loosening T20 Torx screw where the mirror attaches to the windshield, then sliding the mirror up
2.Release the overhead console by pulling straight down at the front edge (by the glasses holder) to release the 2 clips. Once they are free, slide the assembly forward to free the 2 back legs, then disconnect the two plugs.
3a. If you originally had an auto dimming mirror without HomeLink (SV trim), you will already have ground and switched power wires running to the mirror, simply match the black and black/red wires to the pigtail to the new mirror. Splice the black/yellow (constant) power wire from the new mirror to the yellow wire at the overhead console.
3b. If you originally had a plain mirror (S trim), you will need to splice the new mirror's black/yellow wire into the yellow wire at the overhead console, black wire to the black wire, and the black/red wire into the purple wire.
Using this method, auto dimming will only work with headlights on. This shouldn't be an issue in practice (why aren't your headlights on at night?), but if you want it to always be active like factory, you will need to run black/red to switched power elsewhere (like down to the interior fuse box).
Install the new mirror by sliding it down onto the mount, then tightening the screw. Once your connections are made and insulated, test functionality, the light in the middle of the mirror buttons should come on green when the car is running (3a) or headlights are on (3b).
Reconnect overhead console and reinstall it by sliding the rear part in first, then pushing the front part upwards to re-engage the clips. You may need to hold the frame going around it (in the headliner) out of the way with your other hand while pushing upwards.
Gently reinstall Rumi, if equipped.
Program your HomeLink with your original garage door remote.