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Ram Pickup

  1. Check fuse No. 2 (10-amp) in junction block. Repair any short circuits and replace fuse as necessary. Go to next step.
  2. Check for power at fuse. Repair open circuits as necessary. See WIRING DIAGRAMS  . If power exists, go to next step.
  3. Disconnect negative battery cable. Access and disconnect power mirror defogger switch harness connector. See POWER MIRROR DEFOGGER SWITCH  under REMOVAL & INSTALLATION. Check continuity between power mirror defogger switch harness connector terminal No. 2 (Black/Orange wire) and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black/Orange wire between mirror switch and ground.
  4. Reconnect battery cable. Check for voltage at power mirror defogger switch harness connector terminal No. 1 (Dark Blue wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in circuit between switch and fuse.
  5. 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, see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  6. Using voltmeter connected to ground, backprobe defogger grid connector terminal No. 3 (Light Blue/Yellow wire). If voltage exists, check defogger grid. See POWER MIRROR DEFOGGER  under COMPONENT TESTS. If voltage does not 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.
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