My passenger side, split-bench (not the "rumble/ 3rd") seat will not unlock so that I can fold it down. The driver's side folds fine. Specifically, the back rest will not unlock, even after I have already folded up the botton of the seat. The other side works fine.

Any help?

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Al D.
1988 300TE
Anthracite/Grey MB Tex
205/55/16, 16x7.5 Lorinser 15-hole
'95 S-500 corners
50% tint all windows
Kleen Wheels