Both buttons are at the base of the shifter. One looks like the car with an arrow pointing up underneath the car and the other is weird stick looking thing with bulbs on each end with two arrows facing down. The car is a nice ride while my beater e300 TD gets fixed. Drives almost as nice as my '95 diesel!

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles