Yes; in later years that switch had the ability to switch courtesy lights on, added. However, not on your car. I would suspect courtesy light relay on interior fuse panel might be the culprit although key-in warning circuit might also be at fault. I would suspect faulty component first before wiring unless you have recently had dash work done on car.
Does your key-in warning work, i.e., ignition-off but key-in and open door should give warning? Also when door is opened, then closed, key-in should kill the lights immediately before the time-delay does?
For troubleshooting this type of problem you really need the EVTM (elect/vacuum troubleshooting manual), not the service manual, to understand the circuit. Sometimes they do provide troubleshooting charts for elect circuits in service manual.
