i have a 1990 300ce. the seat belt valet/extender works with 12volts but it doesnt extend when i close the door od drivers side. i know the the door switches work the valet/extender (after playing with the pass side). but the driver side wont work. it has power, i can pull it out manually and it will go back in with power, but it wont give me the seat belt when i shut the door. i have aquired a spare from the junk yard it does the same thing.