Chevy Express & Savana
- Check PWR WDO (25-amp) fuse in instrument panel fuse block. See COMPONENT LOCATIONS . If fuse is blown, go to step 4 . If fuse is not blown, go to next step.
- Disconnect master window switch assembly connector. Connect an ohmmeter between ground and master window switch assembly connector terminal "G" (Black wire). See Fig 1 . If continuity exists, go to next step. If continuity does not exist, go to step 5 .
- Turn ignition switch to ACC position. Connect a test light between ground and master window switch assembly connector terminal "H" (Yellow wire). See Fig 1 . If test light does not illuminate, go to step 7 . If test light illuminates, go to step 6 .
- Repair short in Yellow wire between PWR WDO fuse terminal in instrument panel fuse block and either window switch connector. See WIRING DIAGRAMS .
- Repair open in Black wire between master window switch assembly connector terminal "G" and ground. See WIRING DIAGRAMS .
- Replace master window switch assembly. See WINDOW SWITCH under REMOVAL & INSTALLATION.
- Repair open in Yellow wire between PWR WDO fuse terminal in instrument panel fuse block and master window switch. See WIRING DIAGRAMS .