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- Turn ignition switch to RUN position. Using a test light, backprobe between ground and Yellow wire (Brown wire on Cutlass Supreme) at master switch connector. If test light is on, go to next step. If test light is off, repair poor connection or open power circuit between master switch and power window circuit breaker in instrument panel fuse block. See WIRING DIAGRAMS . Recheck system operation.
- Using a test light, backprobe between Black wire and Yellow wire (Brown wire on Cutlass Supreme) at master switch connector. If test light is on, check for poor connection at master switch. Repair as necessary and recheck system operation. If connection is okay, replace master switch and recheck system operation. If test light is off, repair open circuit in Black wire between master switch and ground. Recheck system operation.