My passenger sliding door has quit working. Is the motor in the door?

poss ground issues or bad bulb socket for blinker.

I had a similar problem which I solved by lifting the carpeting in front of the passenger seat and finding a corroded wire which was easily spliced. The wire was beneath the carpet where the front seat passenger's feet would rest. A salesman told me to check that, suggesting that must be a common problem and solution.

how can i fix this