Fix old Mercedes Power Headrests - W210

IF your power head restraints don't adjust up and down with the control on the door switch, THIS is very likely the problem.
This is a 1999 W210 E320 but the procedure and cause of the problem are the same in nearly every Mercedes.
Tools:
t-orx bit T20
Soldering kit

[@debragoss-seeger2978]

Too vague