No. There was no moisture or corrosion, but thanks for asking. What made you think that?

 

Loose connector.

 

Good guess. But NO. No loose connectors anywhere in the wiring harness.

 

here's a recap:

• Seat not jammed.
• No wiring faults.
• Connectors OK
• Connectors mating OK
• No bad switch contacts or PCB tracks.
• Nothing mechanical preventing the switches moving, nothing jamming them
• No moisture involved
• Torq used to remove the facia and reveal the problem.

If the switches can move, freely, correctly and operate the contacts, if the switch connects correctly to the seat module with +12V being switched to the seat module inputs as they should, if the seat module is functioning correctly, then:-

• the actuator works
• the seat module works (yet it doesn't)

so the either the switch unit is floating about and feels like it operating, or its something else.

and I surrender ....

 

finall spent hours to find a problem, that would have taken me 15min or less.

 

Well, @oceanbrave you got very close.

Here is the answer:
The seat forward/backwards and seatback rake switches reside in one black plastic sub-assembly.
They contain no electrical contacts, because they are simply bits of plastic.
That outer sub-assembly is normally mated to a PBC board sub-assembly behind it. Sandwiched directly against the swich sub-assembly.

The PCB board has a number of micro-switches attached to the side that contact the tangs on the 2 seat-side plastic switches.
It is this series of microswitches that operate the aforementioned seat movements.

The PCB board sub-assembly has 4 plastic tangs on its outer edge which mate up (interlock into) 4 plastic cutouts on the seat switch sub-assembly.

Normally, these 2 assemblies snap together, and are held together via these 4 plastic tangs.

The switches moved in exactly the same way when they were working, as when they were not working. There was no hint of an internal problem.

Mysteriously, these 4 tangs separated from the outer plastic switch sub-assembly.
A tiny gap was created, which ensured zero contact of the seat-side switches to the PCB micro switches.
No, the tangs did not break. The assemblies just popped apart.

Bizarre discombobulation.

Repair consisted of simply firmly snapping the 2 halves together. And reattaching to the seat via the 4 Torx screws.

Now you know the rest of the story.

Now only questions remain:
1. How could this possibly have happened? What force could be so strong as to pry this assembly apart, and yet not snap any tangs?
There was no work done in that area of the vehicle. So what sinister poltergeist forces are responsible for this?
2. Will it happen again (since the cause is undetermined)? If it does. I will need to glue (or ziptie if possible) the assembly back together.

 

Ya, you are a big talker, LOL! The guy who suggested electrical cleaner and grease. Your guess was the furthest from correct of anyone. So there is that little fact.

 

LOOK AGAIN!
Electrical cleaner was a reply to oceanbrave
My reply to you, was loose connector AKA connection!
With the switch panel partially working, I would pull it /inspect / properly fix/secure! Before reinstall, clean/seal connectors/contacts.

 

GHeeeeeeeeeeez..! A Piece Of Plastic...

 

as to what dislodged it i would think a few too many bears around the belly. forcing the cushion to mash the trim panel thus wedging the switch to the track slider and separating it..