There is a plug at both the Driver’s door and car body and passenger door and car body, both were seperated, cleaned and repluged. This didn’t solve the problem. We also checked the relays and fuses for the passenger door and that didn’t work either. Actually one Chevy dealer said it was the Driver’s door master door lock control module, a part that sells for $750, while another Chevy Dealer said that 2002 was too early for a master door lock module and it was a $250 switch in the passenger door, both want at least two hours (at $90 and hour) diagnostic time to pinpoint the problem.