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Display unit buttons do not work

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Honda Odyssey, 2003 Honda Odyssey, 2002 Honda Odyssey, 2001 Honda Odyssey, and 2000 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Always check the connectors for poor connections or loose terminals.
  • Before troubleshooting, get the navigation system anti-theft codes.
  • After troubleshooting, enter the navigation system anti-theft codes.
  1. Turn the ignition switch to ACC (I).
  2. Measure the voltage between body ground and display unit connector B (20P) terminals No. 1 and No. 2 individually.
    1. Is there battery voltage? 
      1. YES:  Go to step 3.
      2. NO:  Repair open in the wire between the passenger's under-dash fuse/relay box and the display unit.
      2. Fig 1: Measuring Voltage Between Body Ground & Display Unit Connector B (20P) Terminals No. 1 & No. 2 Individually
      G01520455Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Check for continuity between display unit connector B (20P) terminal No. 10 and body ground.
    1. Is there continuity? 
      1. YES:  Go to step 4.
      2. NO:  Repair the open in the wire between the display unit and body ground (G501).
      2. Fig 2: Checking Continuity Between Display Unit Connector B (20P) Terminal No. 10 & Body Ground
      G01520456Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Turn the ignition switch OFF.
  5. Disconnect the navigation unit and display unit connectors.
  6. Check for continuity between the display unit connector B (20P) terminal No. 14 (for the harness) shield and terminals No. 5 and No. 15 (for the DISP BUS) individually.
    1. Is there continuity? 
      1. YES:  Replace the affected shielded harness.
      2. NO:  Go to step 7.
      2. Fig 3: Checking Continuity Between Display Unit Connector B (20P) Terminal No. 14 (For Harness) Shield & Terminals No. 5 & No. 15 (For DISP BUS) Individually
      G01520457Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Check for continuity between body ground and display unit connector B (20P) terminals No. 5 and No. 15 individually.
    1. Is there continuity? 
      1. YES:  There is a short to body ground in the circuit between the display unit and the navigation unit. Replace the affected shielded harness.
      2. NO:  Go to step 8.
      2. Fig 4: Checking Continuity Between Body Ground & Display Unit Connector B (20P) Terminals No. 5 & No. 15 Individually
      G01520458Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Check for continuity between display unit connector B (20P) terminal No. 5 and navigation unit connector B (16P) terminal No. 7.
    1. Is there continuity? 
      1. YES:  Go to step 9.
      2. NO:  There is an open in the circuit between the display unit and the navigation unit. Replace the affected shielded harness.
      2. Fig 5: Checking Continuity Between Display Unit Connector B (20P) Terminal No. 5 & Navigation Unit Connector B (16P) Terminal No. 7
      G01520459Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Check for continuity between display unit connector B (20P) terminal No. 15 and navigation unit 16P connector B (16P) terminal No. 15.
    1. Is there continuity? 
      1. YES:  Replace the display unit.
      2. NO:  There is an open in the wire between the display unit and the navigation unit. Check for poor connections or loose terminals at the display and navigation units. If a poor connection or loose terminal is found, replace the affected shielded harness.
      2. Fig 6: Checking Continuity Between Display Unit Connector B (20P) Terminal No. 15 & Navigation Unit 16P Connector B (16P) Terminal No. 15
      G01520460Courtesy of AMERICAN HONDA MOTOR CO., INC.
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