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Control Unit Input Test

NOTE: For the hatch glass unlock button test, refer to the rear window wiper control unit input test (see REAR WINDOW WIPER 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 Control Unit Connectors Terminals
    G03676570Courtesy 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. Reconnect all connections 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, go to step 6.
      INPUT TEST (1 Of 2)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      C11 BLU Under all conditions Attach to ground: Parking, side marker, license plate lights and taillights should come on.
      • Blown No. 6 (15 A) fuse in the under-hood fuse/relay box
      • Faulty taillight relay
      • Faulty under-dash fuse/relay box
      • An open in the wire
      F7 BLU/RED Under all conditions Attach to ground: Headlights should come on.
      • Blown No. 15 or 17 (15 A) fuse in the under-hood fuse/relay box
      • Faulty headlight relay 1 or 2
      • An open in the wire
      J2 WHT/RED Under all conditions Check for voltage to ground: There should be battery voltage.
      • Blown No. 9 (15 A) fuse in the under-hood fuse/relay box
      • An open in the wire
      J4 BLK Under all conditions Check for voltage to ground: There should be less than 1 V.
      • Poor ground (G301)
      • An open in the wire
      P18 RED Tailgate open Check for voltage to ground: There should be less than 1 V.
      • Faulty tailgate switch
      • An open in the wire
      Tailgate closed Check for voltage to ground: There should be 5 V or more.
      • Faulty tailgate switch
      • Short to ground
      Q3 GRN Driver's door open Check for voltage to ground: There should be less than 1 V.
      • 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 less than 1 V.
      • 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 less than 1 V.
      • 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 unlocked Check for voltage to ground: There should be less than 1 V.
      • Poor ground (G501)
      • Faulty driver's door lock knob switch
      • An open in the wire
      Driver's door lock knob switch locked 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 locked Check for voltage to ground: There should be less than 1 V.
      • Poor ground (G501)
      • Faulty driver's door lock knob switch
      • An open in the wire
      Driver's door lock knob switch unlocked 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 front passenger's door lock switch unlocked Check for voltage to ground: There should be less than 1 V.
      • Poor ground (G501 or G502)
      • Faulty driver's or front passenger's door lock switch
      • An open in the wire
      Driver's or front passenger's door lock switch in neutral Check for voltage to ground: There should be 5 V or more.
      • Faulty driver's or front passenger's door lock switch
      • Short to ground
      Y12 WHT/BLU Driver's or front passenger's door lock switch locked Check for voltage to ground: There should be less than 1 V.
      • Poor ground (G501 or G502)
      • Faulty driver's or front passenger's door lock switch
      • An open in the wire
      Driver's or front passenger's door lock switch in neutral Check for voltage to ground: There should be 5 V or more.
      • Faulty driver's or front passenger's door lock switch
      • Short to ground
      P2 BLK/YEL Press the keyless transmitter hatch glass unlock button Check for voltage to ground: There should be battery voltage for a moment.
      • Poor ground (G601, G701)
      • Faulty hatch glass opener actuator
      • An open in a wire
  6. Disconnect the connectors, and make these input tests at the connectors.
    • 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 (2 Of 2)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      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 (20 A) fuse in the under-hood fuse/relay box
      • Faulty driver's door lock actuator
      • An open in the wire
      M9 YEL/GRN
      M6 YEL/BLK Connect J7 terminal to M6 [M8] terminal, and M8 [M6] terminal to J4 terminal. Check actuator operation: The front passenger's door lock actuator should lock [unlock].
      • Blown No. 16 (20 A) fuse in the under-hood fuse/relay box
      • Faulty front 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: Both rear door lock actuators and the tailgate lock actuator should lock [unlock].
      • Blown No. 16 (20 A) fuse in the under-hood fuse/relay box
      • Faulty left or right door lock actuator
      • Faulty tailgate lock actuator
      • An open in the wire
      P17 YEL/BLK
      J6 ORN Under all conditions Attach to ground: The horn should sound.
      • Blown No. 7 (15 A) fuse in the under-hood fuse/relay box
      • Faulty horn relay
      • Faulty horn
      • An open in the wire
      J7 WHT Under all conditions Check for voltage to ground: There should be battery voltage.
      • Blown No. 16 (20 A) fuse in the under-hood fuse/relay box
      • An open in the wire
      K2 BLU/ORN Under all conditions Check for continuity between the K2 terminal and the keyless receiver unit 5P connector No. 2 terminal with the 5P connector disconnected: There should be continuity end to end with no continuity to ground.
      • An open in the wire
      • Short to ground
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