The presenters work pefectly in both my W124s. They are activated by the door opening, the key does NOT have to be on, and it does NOT matter if any weight is on the seat. Then once the key is turned on, the presenter will operate.

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1994 E320 Cabriolet
1992 300CE (Sold)
1991 300SE (Sold)
1986 560SEL (Sold)