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HOMESERVICE MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN CARGO, 4.3 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSREAR WINDOW DEFOGGER & MIRROR DEFOGGERSYSTEM TESTSREAR WINDOW DEFOGGER INOPERATIVE (EXPRESS & SAVANA)
2000 Chevrolet Chevy Express G3500, Van Cargo, 4.3 W

Rear Window Defogger Inoperative (Express & SAVANA)

2000 Chevrolet Chevy Express G3500, Van Cargo, 4.3 WSECTION Rear Window Defogger Inoperative (Express & SAVANA)
  1. Review information in DESCRIPTION & OPERATION  . Check operation of rear window defogger. If rear window defogger is still inoperative, go to next step. If rear window defogger operates, check for intermittent in wiring or connections. See WIRING DIAGRAMS  .
  2. If both rear window defoggers are inoperative, go to next step. If only one rear window defogger is inoperative, go step  13 .
  3. Remove rear window defogger relay. See REAR DEFOGGER RELAY  under REMOVAL & INSTALLATION. Using test light connected to ground, probe rear window defogger relay connector terminal C1 (Orange wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  9 .
  4. Connect test light between rear window defogger relay connector terminal C1 (Orange wire) and terminal C2 (Black wire). If test light illuminates, go to step  6 . If test light does not illuminate, go to next step.
  5. Repair open in Black wire between rear window defogger relay connector terminal C2 and ground. See WIRING DIAGRAMS  . Recheck system operation.
  6. Connect test light between rear window defogger relay connector terminal A1 (Orange wire) and terminal C2 (Black wire). Turn ignition on. Depress rear window defogger switch to ON position. If test light illuminates, go to next step. If test light does not illuminate, go to step  10 .
  7. Connect fused jumper wire between rear window defogger relay connector terminal C1 (Orange wire) and terminal A2 (Purple wire). If rear window defogger grid operates, go to next step. If rear window defogger grid does not operate, go to step  11 .
  8. Replace rear window defogger relay. Recheck system operation.
  9. Check RR DEFOG fuse (25-amp), located in instrument panel fuse block. See COMPONENT LOCATIONS  . If fuse is okay, repair open in Orange wire between RR DEFOG fuse and rear window defogger relay connector terminal C1. If fuse is blown, replace fuse and repair short to ground in Orange wire between RR DEFOG fuse and rear window defogger relay connector terminal C1. Recheck system operation.
  10. If rear window defogger and both heated mirrors are inoperative, go to HEATED OUTSIDE MIRRORS INOPERATIVE (EXPRESS & SAVANA)  . If rear window defogger is inoperative and both heated mirrors operate, go to step  12 .
  11. Repair open in Purple wire between rear window defogger relay connector terminal A2 and splice S429. See WIRING DIAGRAMS  . Recheck system operation.
  12. Repair open in Orange wire between rear window defogger relay connector terminal A1 and splice S245. See WIRING DIAGRAMS  . Recheck system operation.
  13. Disconnect rear window defogger element connectors at inoperative grid. Using test light connected to ground, probe rear window defogger element connector terminal "A" (Black wire). Turn ignition on. Depress rear window defogger switch to ON position. If test light illuminates, go to step  15 . If test light does not illuminate, go to next step.
  14. Repair open in Purple wire between inoperative rear window defogger grid and splice S429. See WIRING DIAGRAMS  . Recheck system operation.
  15. Connect test light between inoperative rear window defogger grid connector Black wire terminals. If test light illuminates, go to next step. If test light does not illuminate, go to step  17 .
  16. Repair element if possible. See GRID FILAMENT REPAIR  under ON-VEHICLE SERVICE. If repair is unsuccessful, replace window glass.
  17. Repair open in Black wire between inoperative rear window defogger grid connector terminal "A" and ground. See WIRING DIAGRAMS  . Recheck system operation.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.