SOURCE: 1987 corvette electric rear window release wiring diagram
You need to check using a multimeter on the solenoid for the operating voltage when the relay clicks on activating. If there is voltage then the solenoid is faulty and if not the relay contact points have burnt out and so does not give the connection for switching the voltage.In either case get yourself a multimeter or a 12 volt park lamp bulb to check the voltage on the solenoid.
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