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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
    G03653214Courtesy 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 are OK, go to step 5.
  5. With the connector still disconnected, make these input tests at the connector.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step 6.
      POSSIBLE CAUSE

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      J4 BLK Under all conditions Check for continuity to ground:
      There should be continuity.
      • Poor ground(G301)
      • An open in the wire
      J2 WHT/RED Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 9 (7.5 A) fuse in the underhood fuse/relay box
      • An open in the wire
      J7 WHT Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 16 (15 A) fuse in the underhood fuse/relay box
      • An open in the wire
      F7 BLU/RED Under all conditions Attach to ground:
      The headlights should come on.
      • Blown No. 15 or 17 (20 A) fuse in the underhood fuse/relay box
      • Faulty headlight relay 1 or 2
      • An open in the wire
      J6 ORN Under all conditions Attach to ground:
      The horn should sound.
      • Faulty horn relay
      • Faulty horn
      • An open in the wire
      K2 BLU/ORN Under all conditions Check for continuity between the K2 terminal and keyless receiver unit 5P connector No. 2 terminal with the 5P connector disconnected:
      There should be continuity.      		 An open in the wire
      M7 YEL/BLK Connect J7 terminal to M7 (M9) terminal, and M9 (M7) terminal to J4 terminal Check actuator operation:
      The driver's door lock actuator should lock (unlock).
      • Blown No. 16 (15 A) fuse in the underhood fuse/relay box
      • Faulty driver's door lock actuator
      • An open in the wire
      M9 YEL/GRN
      M6 YEL/GRN Connect J7 terminal to M6 (M8) terminal, and M8 (M6) terminal to J4 terminal Check actuator operation:
      The passenger's door lock actuator should lock (unlock).
      • Blown No. 16 (15 A) fuse in the underhood fuse/relay box
      • Faulty passenger's door lock actuator
      • An open in the wire
      M8 YEL
      P16 YEL Connect J7 terminal to P17 (P16) terminal, and P16 (P17) terminal to J4 terminal Check actuator operation:
      The hatch lock actuator should lock (unlock).
      • Blown No. 16 (15 A) fuse in the underhood fuse/relay box
      • Faulty hatch lock actuator
      • An open in the wire
      P17 YEL/BLK
  6. Reconnect all 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.
      POSSIBLE CAUSE

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      C11 BLU Under all conditions Attach to ground:
      The parking side marker, license plate lights, and taillights should come on.
      • Blown No. 2 (15 A) fuse in the underhood fuse/relay box
      • Faulty taillight relay
      • Faulty under-dash fuse/relay box
      • An open in the wire
      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
      P18 RED Hatch open Check for voltage to ground:
      There should be 1 V or less.
      • Faulty hatch latch switch
      • An open in the wire
      Hatch closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty hatch latch 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
      Y7 WHT/BLK Driver's door lock knob switch in UNLOCKED position 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 lock knob switch in LOCKED position Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's door lock knob switch
      • Short to ground
      Y8 YEL/RED Driver's door lock knob switch in LOCKED position 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 lock knob switch in UNLOCKED position Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's door lock knob switch
      • Short to ground
      Y10 WHT/GRN Driver's or passenger's door lock switch in UNLOCKED position Check for voltage to ground:
      There should be 1 V or less.
      • Poor ground (G401, G402)
      • Faulty driver's or passenger's door lock switch
      • An open in the wire
      Driver's or passenger's door lock switch in neutral or LOCKED position Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's or passenger's door lock switch
      • Short to ground
      Y12 WHT/BLU Driver's or passenger's door lock switch in LOCKED position Check for voltage to ground:
      There should be 1 V or less.
      • Poor ground (G401, G402)
      • Faulty driver's or passenger's door lock switch
      • An open in the wire
      Driver's or passenger's door lock switch in neutral or UNLOCKED position Check for voltage to ground: There should be 5 V or more.
      • Faulty driver's or passenger's door lock switch
      • Short to ground
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