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RES power will not turn on

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Check the vehicle battery condition first BATTERY TEST ).
  • Check the connectors for poor connections or loose terminals.
  1. Turn the ignition switch to ON (II), then press the REAR PWR button ON.

    Does the screen open? 

    YES  -Operation is normal at this time.

    NO  -Go to step 2.

  2. Check the REAR PWR button indicator.

    Is the indicator on? 

    YES  -Go to step 3.

    NO  -Go to audio-navigation unit button does not work AUDIO-NAVIGATION UNIT BUTTON DOES NOT WORK (WITH NAVIGATION) ).

  3. Turn the ignition switch to LOCK (0).
  4. Check the No. 7 (10 A) fuse and the No. 21 (7.5 A) fuse in the under-dash fuse/relay box.

    Are the fuses OK? 

    YES  -Go to step 5.

    NO  -Replace the fuse(s), and recheck.

  5. Check that the rear controller and screen 24P connector is properly connected.

    Is it connected properly? 

    YES  -Go to step 6.

    NO  -Repair a poor connection and reconnect the connector, and recheck the function.

  6. Turn the ignition switch to ON (II).
  7. Measure the voltage between body ground and rear controller and screen 24P connector terminals No. 1 and No. 2 individually.
    Fig 1: Measuring Voltage Between Body Ground And Rear Controller And Screen 24P Connector
    G08055577Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 8.

    NO  -Repair an open in the wire between the No. 7 (10 A) fuse and the No. 21 (7.5 A) fuse in the under-dash fuse/relay box and the rear controller and screen connector.

  8. Measure the voltage between rear controller and screen 24P connector terminal No. 24 and body ground.
    Fig 2: Measuring Voltage Between 24P Connector Terminal No. 24 And Body Ground
    G08055578Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there less than 0.2 V? 

    YES  -Go to step 9.

    NO  -Repair an open or high resistance in the wire between rear controller and screen 24P connector terminal No. 24 and body ground (G506) CONNECTOR TO FUSE/RELAY BOX INDEX ).

  9. Turn the ignition switch to LOCK (0).
  10. Disconnect the rear controller and screen 24P connector and audio-navigation unit connector E (16P).
  11. Check for continuity between rear controller and screen 24P connector terminal No. 12 and body ground.
    Fig 3: Checking Continuity Between 24P Connector Terminal No. 12 And Body Ground
    G08055579Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to body ground in the wire between the audio-navigation unit and the rear controller and screen.

    NO  -Go to step 12.

  12. Check for continuity between rear controller and screen 24P connector terminal No. 12 and audio-navigation unit connector E (16P) terminal No. 4.
    Fig 4: Checking Continuity Between 24P Connector And Connector E (16P)
    G08055580Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 13.

    NO  -Repair an open in the wire between the rear controller and screen and the audio-navigation unit.

  13. Check for continuity between body ground and rear controller and screen 24P connector according to the table.
    Rear controller and screen connector Wire color
    No. 3 LT BLU
    No. 14 PUR
    Fig 5: Checking Continuity Between Body Ground And 24P Connector
    G08055581Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -There is a short to body ground in the wire(s) between the rear controller and screen and the audio-navigation unit. Replace the affected shielded harness.

    NO  -Go to step 14.

  14. Check for continuity between the terminals of rear controller and screen 24P connector according to the table.
    From terminal To terminals
    No. 3 (LT BLU) No. 13 (BRN), No. 14 (PUR)
    No. 13(BRN) No. 14 (PUR)
    Fig 6: Checking Continuity Between Rear Controller And Screen 24P Connector
    G08055582Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity between any of the terminals? 

    YES  -There is a short in the wires between the rear controller and screen and the audio-navigation unit. Replace the affected shielded harness.

    NO  -Go to step 15.

  15. Check for continuity between rear controller and screen 24P connector and audio-navigation unit connector E (16P) according to the table.
    Rear controller and screen connector Audio-Navigation unit connector Wire color
    No. 3 E16 LT BLU
    No. 14 E8 PUR
    Fig 7: Identifying Rear Controller And Screen 24P Connector
    G08055583Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 8: Identifying Audio-Navigation Unit Connector E (16P)
    G08055584Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Substitute a known-good rear controller and screen  , and recheck. If the symptom/indication goes away, replace the original rear controller and screen  . If the symptom is still present, replace the audio-navigation unit AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).

    NO  -There is an open in the wire(s) between the rear controller and screen and the audio-navigation unit. Replace the affected shielded harness.

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