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Test 1: All Windows Inoperative

NOTE: Master window switch on 2-door models has only one connector. Master window switch on 4-door models has 2 connectors.
  1. Disconnect master window switch connector C1. Turn ignition switch to RUN position. Using a test light connected to ground, backprobe master window switch connector C1 terminal "G" (Brown wire). See Fig 1 . If test light comes on, go to next step. If test light does not come on, go to step  3 .
  2. Connect test light between master window switch connector C1 terminals "G" (Brown wire) and "B" (Black wire). If test light comes on, check for poor connection at master window switch. If connection is okay, replace master window switch. See WINDOW SWITCH  under REMOVAL & INSTALLATION. If test light does not come on, go to step  4 .
  3. Using test light connected to ground, backprobe right-side instrument panel fuse block connector C3 terminal A8 (Brown wire). See Fig 2 . If test light comes on, go to step  5 . If test light does not come on, go to step  6 .
  4. Repair open in Black wire between master window switch and ground located in left side of passenger compartment. See WIRING DIAGRAMS  .
  5. Repair open in Brown wire between master window switch and right-side instrument panel fuse block. See WIRING DIAGRAMS  .
  6. Replace right-side instrument panel fuse block. After repair is complete, retest system.
Fig 1: Identifying Power Window Connector Terminals
G98B00431Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying Instrument Panel Fuse Block Connector C3 Terminals
G99F02313Courtesy of GENERAL MOTORS CORP.