[W126 Coupe] More help?

[Dick Spellman]

Hi Mike:

First, replace the fuse you know is looking okay and apparently working the
headrest ANYWAY with a new one.  Sometimes the fuse looks good and even
carries a small amount of juice across it but, if you never replaced
it...now is the time!

If that does not work, you either have a bad door mounted seat controller
switch or the harness may be unplugged partially under the seat.

Question, do you hear any motor noise when you attempt to move the seat?  If
yes, but no movement, check the hard cables that drive the gears to see if
they are loose or kinked under the seat.  If no, pull the seat button off
the door switch and try working the plastic stubs by hand to see if they
make the motor/seat work.

If none of this works then it's time to remove the seat.  Ideally, you would
remove the two bolts under the plastic trim to either side of the front of
the seat at the floor and then remove the two in the rear followed by the
transmission hump bolt for the seat belt rail that holds the seat belt clip.

Then lift the seat out of the car, place on a bench and test the workings
using a 12volt DC power source.  If everything checks out with a 12VDC check
then you need to remove the door switch and replace.  For instructions on
the door switch removal, I'd need the year of your SEC.  Depending on the
year of your SEC you may need a harness kit in addition to the switch should
they require replacement.

Good luck.

Dick