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Control Unit Input Test

  1. Before testing, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
  2. Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  3. Disconnect the under-dash fuse/relay box connectors.
    NOTE: All connectors are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
    G03653101Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Inspect the connector and socket terminals to be sure. They are all making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step 5.
  5. With the connectors still disconnected, make this input test at the connector.
    • If the test indicates a problem, find and correct the cause, then recheck the system.
    • If the input test proves OK, go to step 6.
      INPUT TEST (CONNECTORS DISCONNECTED)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      K2 BLU/ORN Under all conditions Check for continuity between the K2 terminal and the keyless receiver unit 5P connector No. 2 terminal:
      There should be continuity.      		 An open in the wire
  6. Reconnect the connectors to the under-dash fuse/relay box, and make these input tests at the appropriate connectors on the under-dash fuse/relay box.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the multiplex control unit must be faulty, replace the under-dash fuse/relay box assembly.
      INPUT TEST (CONNECTORS CONNECTED)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      O7 GRN/RED Ceiling light switch in middle position Attach to ground:
      Ceiling light should come on.
      • Blown No. 3 (7.5 A) fuse in the under-hood fuse/relay box
      • Blown bulb
      • Faulty ceiling light
      • An open in the wire
      P18 RED Hatch open Check for voltage to ground:
      There should be 1 V or less.
      NOTE: Remove the No. 3 (7.5 A) fuse from the under-hood fuse/relay box.
      • Poor ground (G701)
      • Faulty hatch latch switch
      • An open in the wire
      Hatch closed Check for voltage to ground:
      There should be 5 V or more.
      NOTE: Remove the No. 3 (7.5 A) fuse from the under-hood fuse/relay box.
      • Faulty hatch latch switch
      • Short to ground
      Q3 GRN Driver's door open Check for voltage to ground:
      There should be 1 V or less.
      • Faulty driver's door switch
      • An open in the wire
      Driver's door closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's door switch
      • Short to ground
      Q4 LT GRN/RED Passenger's door open Check for voltage to ground:
      There should be 1 V or less.
      • Faulty passenger's door switch
      • An open in the wire
      Passenger's door closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty passenger's door switch
      • Short to ground
      X5 RED/WHT Ignition key inserted into the ignition switch Check for voltage to ground:
      There should be 1 V or less.
      • Poor ground (G401)
      • Faulty ignition key switch
      • An open in the wire
      Ignition key removed from the ignition switch Check for voltage to ground:
      There should be 5 V or more.
      • Faulty ignition key switch
      • Short to ground
      X8 WHT/BLK Under all conditions Attach to ground:
      Ignition key light should come on.
      • Blown No. 3 (7.5 A) fuse in the under-hood fuse/relay box
      • Faulty ignition key light
      • An open in the wire
      Y8 YEL/RED Driver's door locked Check for voltage to ground:
      There should be 1 V or less.
      • Poor ground (G401)
      • Faulty driver's door lock knob switch
      • An open in the wire
      Driver's door unlocked Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's door lock knob switch
      • Short to ground
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