Alright there is this little button on the shift plate for the automatic 2000 s40 1.9T that looks like a W. I was wondering what this was for because as far as my understanding goes the overdrive is a button on the actual shifter just below the release knob. any information is helpful

merry christmas and happy holidays!
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1999 Nissan Sentra GXE GA16DE
Short Ram Intake
Carbon Fiber Hood
Matrix Racing Halo Headlights
Clear Corners
M3 Sport Mirrors
4x6.5 Alpine SPS 120A
Pyramid Head Unit
2x Volfenhag 12'' Aluminum Cone Subwoofers
Legacy 2000W 4ch Amplifier