In my GIF, the Diodes for the Map lights are there so that you have independent control of them.
To try it out go here:
Circuit Simulator
and Import from Text, then paste this in to see why the diodes are needed...
Code:
$ 1 0.0000049999999999999996 10.20027730826997 50 12 43
R -528 -128 -528 -176 0 0 40 12 0 0 0.5
w -528 -48 -528 32 0
162 -528 32 -528 96 2 default-led 1 1 1 0.1
s -528 96 -528 160 0 1 false
w -528 32 -400 32 0
s -400 96 -400 160 0 1 false
162 -400 32 -400 96 2 default-led 1 1 1 5
w -528 -48 -272 -48 0
w -272 -48 -272 32 0
162 -272 32 -272 96 2 default-led 1 1 1 0.1
w -288 160 -288 240 0
S -272 96 -272 160 0 1 false 0 2
g -256 160 -256 176 0
s -288 272 -288 336 0 1 false
g -288 336 -288 352 0
g -400 160 -400 176 0
g -528 160 -528 176 0
w -528 96 -560 96 0
w -400 96 -432 96 0
w -432 240 -288 240 0
w -432 240 -560 240 0
d -432 96 -432 240 2 default
w -528 -128 -528 -80 0
w -528 -80 -528 -48 0
w -528 -80 -80 -80 0
g -64 160 -64 176 0
S -80 96 -80 160 0 1 false 0 2
w -96 160 -96 240 0
162 -80 32 -80 96 2 default-led 1 1 1 0.1
w -80 -80 -80 32 0
w 48 -80 48 32 0
162 48 32 48 96 2 default-led 1 1 1 0.1
w 32 160 32 240 0
S 48 96 48 160 0 1 false 0 2
g 64 160 64 176 0
w -80 -80 48 -80 0
w 48 -80 176 -80 0
g 192 160 192 176 0
S 176 96 176 160 0 1 false 0 2
w 160 160 160 240 0
162 176 32 176 96 2 default-led 1 1 1 0.1
w 176 -80 176 32 0
w -96 240 32 240 0
w 32 240 160 240 0
g 32 336 32 352 0
s 32 272 32 336 0 1 false
x -512 67 -482 70 4 12 MapL
x -250 67 -187 70 4 12 Front\sDome
x -382 69 -350 72 4 12 MapR
x -62 68 9 71 4 12 Center\sDome
x 65 70 131 73 4 12 Hatch\sDome
x 197 70 228 73 4 12 Hatch
x 53 310 152 313 4 12 Hatch\sDoor\sSwitch
x -271 300 -165 303 4 12 Main\sDoor\sSwitches
w -288 240 -288 272 0
w 32 240 32 272 0
x -59 141 -43 144 4 12 On
x 67 143 83 146 4 12 On
x 196 141 212 144 4 12 On
x -250 140 -234 143 4 12 On
x -550 145 -534 148 4 12 On
x -424 145 -408 148 4 12 On
d -560 96 -560 240 2 default
x -649 302 -507 305 6 12 1N4001\sor\s1N5406\sDiodes
x -648 278 -326 281 4 12 Wiring\sfrom\sMap\sto\sFront\sdome\sis\sBEFORE\sMap\slight\sswitch!
w -656 272 -656 80 0
w -656 80 -560 80 0
