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Test Ah: Night Vision Display Does Not Dim

  1. Operate night vision system. See NIGHT VISION  under DESCRIPTION & OPERATION. If any problems exist, go to next step.
  2. Position vehicle approximately 25 feet (8 meters) from the nearest object. Cover windshield with a mat. Cover ambient light sensor. Turn ignition on. Turn headlights on. Turn head-up display (HUD) on. Move dimmer control switch on the HUD switch up and down. If night vision image does not brighten when the dimmer control switch is moved up or does not dim when switch is moved down, go to next step. If night vision image brightens when the dimmer control switch is moved up and dims when switch is moved down, problem is intermittent, check wiring and connections between HUD control unit, HUD switch and night vision camera.
  3. Turn ignition off. Disconnect HUD control unit. Turn ignition on. Measure voltage between ground and HUD harness connector terminal "E"(Tan wire). See Figure. Move dimmer switch up and down. If voltage does not change from 2.5 to 12 volts, go to next step. If voltage changes from 2.5 to 12 volts, go to step  5.
  4. Check for an open, short to voltage or a short to ground in Tan wire between HUD control module harness connector terminal "E" and HUD display switch harness connector terminal "D". Figure and Figure . If no problem was found, go to step  6. If a problem was found and corrected, go to step  9.
  5. Check for faulty connections at HUD control module. If no problem was found, go to step  8. If a problem was found and corrected, go to step  9.
  6. Check for faulty connections at HUD switch harness connector. If no problem was found, go to next step. If a problem was found and corrected, go to step  9.
  7. Replace HUD switch. See HUD SWITCH  under REMOVAL & INSTALLATION. After replacement, go to step  9.
  8. Replace HUD module. See HUD MODULE  under REMOVAL & INSTALLATION After replacement, go to next step.
  9. Operate night vision in order to verify repair. If system operates correctly, system is okay at this time. If system does not operate correctly, return to step  2.
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