Test B: Rear Window Defogger Does Not Turn Off Automatically
- Disconnect 5-pin rear window defogger relay harness connector C220. Rear window defogger relay is located behind center of instrument panel. See Figure . Turn ignition switch to RUN position. Depress rear window defogger button off. Measure resistance between ground and rear window defogger relay harness connector C220 terminal No. 85 (Yellow/Black wire). See Figure . If resistance is 10 k/ohms or less, go to next step. If resistance is more than 10 k/ohms, go to step 3 .
- Turn ignition switch to LOCK position. Disconnect 12-pin instrument cluster harness connector C250. It may be necessary to remove instrument cluster for access to connector. See REMOVAL & INSTALLATION . Measure resistance between ground and instrument cluster harness connector C250 terminal No. 10 (Yellow/Black wire). See Figure . If resistance is more than 10 k/ohms, go to step 4 . If resistance is 10 k/ohms or less, repair short to ground in Yellow/Black wire between instrument cluster and rear window defogger relay. See WIRING DIAGRAMS .
- Disconnect rear window defogger grid harness connector C433 located on left side of rear window defogger grid. Measure voltage between ground and rear window defogger grid harness connector C433 Brown/Light Blue wire terminal. If 10 volts or less exist, replace rear window defogger relay. If more than 10 volts exist, repair short to battery voltage in Brown/Light Blue wire between rear window defogger relay and rear window defogger grid. See Figure .
- Turn ignition switch to LOCK position. Disconnect all instrument cluster harness connectors. Inspect all instrument cluster harness connectors for loose, damaged or corroded terminals. If terminals are damaged, repair as necessary. If terminals are not damaged, reconnect all instrument cluster harness connectors. Ensure instrument cluster harness connectors are seated properly. If problem still exists, replace instrument cluster. See REMOVAL & INSTALLATION .