1.Pull up front of carpet cover in Console tray and remove single Phillips screw.
2.Gently pry up the Black Plastic surround at the shifter.
3.Swing the wooden cover (Shifter console portion) upwards+forwards 90
degrees.(There are two plastic hooks that "Hook" into the Vertical portion
of the Console,at the front,underneath the ashtray...try not to break them)
4.You may now grasp the Mirror remote control switch firmly and wiggle it as
you pull it up and out of the socket in the console.

5.You will want to get a sizable towel (Not the fancy ones,S.O. will kill you)
on a flat surface with a good light source.[The towel will hopefully prevent
the semi-microscopic parts you are about to Liberate from total escape.]
6.Turn the switch upside down.On the sides are square cutouts 3-4 mm in
size into which the protrusions from the inner portion of the switch "Lock".
7.You are going to use toothpicks as wedges to release the inner portion of
the switch.
One side of the switch has 2 protrusions ,the other has 3 protrusions.
Once you have,Gently, released the inner portion of the switch;Gently
And carefully pull it up and out of the bottom.
Be very careful! there are 3 Tiny silver "Doggie Bone" Electrical connectors
that rest on 6 Tiny Coil Springs...If you lose ANY of these...
You're Screwed!
8.Lay the "Doggie Bone" and Coil Spring portion of the switch Gently aside.
(I went WILD,and treated the Coil Springs and the "D Bs" with WD40
[a minute portion] which helps to hold them in place...I am a
foolish risk taker!)
9 You are now looking at the circuit board part of the switch(with the pin
barrel type connectors on the other side).
In one corner of the board is the smallest damn 12 volt light bulb I've
ever seen.
You will have to de-solder the old burnt out bulb and solder in a new
one.
10. I used radio Shack part# 7219 (two bulbs,with wire terminal bases)
12 volts 60mA.
(I am actively looking for an LED replacement bulb...'Can't find one
that small yet)

In picture 2 the toothpick is being inserted between the inner and outer portions of the switch to release the locking tabs.
In pictures 3,4+5 the toothpick points to the light bulb.
In pictures 4+5 one of the "Doggie bone" connectors,with it's two coil springs ("Glommed on" with Dielectric grease) is visible below the left lower portion of the switch.

Take your time...Prior Planning ("Semper Paratus") ELIMINATE ALL "Distraction Opportunities" from any sources!

Attached Thumbnails

         

__________________
'84 300SD sold
124.128