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Screen Backlight Does Not Dim/Remains Dim

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Check the vehicle battery condition first.
  • Check the dash and gauge dimmer operation. If there is a problem with the dash and gauge dimmer, repair it before doing this troubleshooting.
  1. Turn the ignition switch to ON (II).
  2. Turn the combination light switch ON and OFF, then back ON.

    Does the screen backlight dim with the combination light switch in the ON position? 

    YES  - Operation is normal at this time. ■

    NO  - Go to step  3.

  3. Check the backlight settings in the display set up (refer to the Owner's Manual for more information).

    Are the display settings set properly? 

    YES  - Go to step  4.

    NO  - Adjust the display settings, and recheck the function. ■

  4. Turn the ignition switch to LOCK (0).
  5. Check that the rear controller and screen and audio unit are properly connected.

    Are the connections OK? 

    YES  - Go to step  6.

    NO  - Reconnect the connector, and recheck the function. ■

  6. Turn the ignition switch to ON (II).
  7. Measure the voltage between rear controller and screen 24P connector terminal No. 11 and body ground. Turn the combination light switch on and off to see if the voltage changes.

    Is there battery voltage with the combination light switch ON? 

    YES  - Go to step  8.

    NO  - Repair open in the wire between the No. 14 (7.5A) fuse in the under dash fuse box and the rear controller and screen. ■

    Fig 1: Measuring Voltage Between Rear Controller & Screen 24P Connector Terminal No. 11 & Body Ground
    G05967063Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Turn the headlights ON, and check the illumination of several other unit/switches not related to the rear entertainment system.

    Are the buttons illuminated? 

    YES  - Go to step  9.

    NO  - Troubleshoot the interior lights. Start by checking the No. 14 (7.5 A) fuse in the under-dash fuse/relay box. If there is OK, go to MICU input test (see CONTROL UNIT INPUT TEST ). ■

  9. Measure the voltage between rear controller and screen 24P connector terminal No. 11 and No. 23 as you turn the gauge brightness controller from dim to bright.

    Does the voltage change from about 3 V (low) to battery voltage (max)? 

    YES  - Go to step  10.

    NO  -

    • If there is 0 V at all times, repair open in the wire between the gauge and the rear controller and screen. ■
    • If there is battery voltage at all times, repair short in the wire between the gauge and the rear controller and screen. ■
      • Fig 2: Measuring Voltage Between Rear Controller & Screen 24P Connector Terminal No. 11 & No. 23
      G05967064Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Measure the voltage between rear controller and screen 24P connector terminal No. 24 and body ground.

    Is there less than 0.2 V? 

    YES  - Replace the rear controller and screen (see REAR CONTROLLER AND SCREEN REMOVAL/INSTALLATION  ). ■

    NO  - Repair open or high resistance in the wire between rear controller and screen 24P connector No. 24 terminal and body ground (G404) (see CONNECTOR TO HARNESS INDEX ). ■

    Fig 3: Measuring Voltage Between Rear Controller & Screen 24P Connector Terminal No. 24 & Body Ground
    G05967065Courtesy of AMERICAN HONDA MOTOR CO., INC.
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