Power Mirror Defogger System
NOTE:
For Dakota and Durango diagnostic tests and procedures, see appropriate REAR WINDOW DEFOGGERS & HEATED MIRRORS article.
- Check fuse No. 2 (10-amp) in junction block. If fuse is blown, repair any short circuits and replace fuse as necessary. See WIRING DIAGRAMS . If fuse is not blown, go to next step.
- Disconnect negative battery cable. Disconnect power mirror defogger switch harness connector. See POWER MIRROR DEFOGGER SWITCH under REMOVAL & INSTALLATION. Check continuity between power mirror defogger switch ground circuit and ground. If continuity exists, go to next step. If continuity does not exist, repair open in ground circuit between mirror switch and ground.
- Reconnect battery cable. Check for battery voltage between ground and battery feed circuit at power mirror defogger switch connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in circuit between switch and fuse.
- Reconnect power mirror defogger switch harness connector. Turn ignition on. Press heated mirror switch. If Amber light illuminates, go to next step. If Amber light does not illuminate, replace A/C and heater control unit. For removal and installation procedure, see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
- Using DVOM connected to ground, backprobe battery feed circuit at defogger grid connector of suspect mirror. If battery voltage exists, check defogger grid. See POWER MIRROR DEFOGGER under COMPONENT TESTS. If battery voltage does not exist, check for opens in battery feed circuit. If no opens exist, replace A/C and heater control unit. For removal and installation, see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.