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Control Unit Input Test

NOTE: Before testing, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
  1. Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  2. Disconnect the under-dash fuse/relay box connectors C, F, J, K, M, P, Q, X and Y.
    NOTE: All connectors are shown from wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
    G05451536Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. 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  4.
  4. 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  5.
      PROBLEM SYMPTOM TABLE

      Cavity Wire Test condition Test: Desired result Possible cause if desired 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. 2 (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
      • Blown headlight bulb
      • An open in the wire
      J2
      K4      		 WHT/RED Under all conditions Measure voltage to ground:
      There should be battery voltage.
      • Blown No. 9 (10 A) fuse in the under-hood fuse/relay box
      • An open in the wire
      J4 BLK Under all conditions Measure voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G401)
      • An open in the wire
      P18 RED Hatch or tailgate open Measure voltage to ground:
      There should be less than 0.5 V.
      • Faulty tailgate latch switch
      • Faulty hatch latch switch
      • An open in the wire
      Hatch and tailgate closed Measure voltage to ground:
      There should be battery voltage.
      • Faulty tailgate latch switch
      • Faulty hatch latch switch
      • Short to ground in the wire
      Q3 GRN Driver's door or left rear door open Measure voltage to ground:
      There should be less than 0.5 V.
      • Faulty driver's door switch
      • Faulty left rear door switch
      • An open in the wire
      Driver's door and left rear door closed Measure voltage to ground:
      There should be battery voltage.
      • Faulty driver's door switch
      • Faulty left rear door switch
      • Short to ground in the wire
      Q4 GRY/BLK Passenger's door or right rear door open Measure voltage to ground:
      There should be less than 0.5 V.
      • Faulty passenger's door switch
      • Faulty right rear door switch
      • An open in the wire
      Passenger's door and right rear door closed Measure voltage to ground:
      There should be battery voltage.
      • Faulty passenger's door switch
      • Faulty right rear door switch
      • Short to ground in the wire
      X5 RED/WHT Ignition key inserted into the ignition switch Measure voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G401)
      • Faulty ignition key switch
      • An open in the wire
      Ignition key removed from the ignition switch Measure voltage to ground:
      There should be battery voltage.
      • Faulty ignition key switch
      • Short to ground in the wire
      Y7 WHT/BLK Driver's door lock knob switch unlocked Measure voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G501)
      • Faulty driver's door lock knob switch
      • An open in the wire
      Driver's door lock knob switch locked Measure voltage to ground:
      There should be battery voltage.
      • Faulty driver's door lock knob switch
      • Short to ground in the wire
      Y8 YEL/RED Driver's door lock knob switch locked Measure voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G501)
      • Faulty driver's door lock knob switch
      • An open in the wire
      Driver's door lock knob switch unlocked Measure voltage to ground:
      There should be battery voltage.
      • Faulty driver's door lock knob switch
      • Short to ground in the wire
      Y10 WHT/GRN Driver's door lock switch UNLOCK position Measure voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G501)
      • Faulty driver's door lock switch
      • An open in the wire
      Driver's door lock switch in neutral or LOCK position Measure voltage to ground:
      There should be battery voltage.
      • Faulty driver's door lock switch
      • Short to ground in the wire
      Y12 WHT/BLU Driver's door lock switch LOCK position Measure voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G501)
      • Faulty driver's door lock switch
      • An open in the wire
      Driver's door lock switch in neutral or UNLOCK position Measure voltage to ground:
      There should be battery voltage.
      • Faulty driver's door lock switch
      • Short to ground in the wire
  5. 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.
      PROBLEM SYMPTOM TABLE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      J7 WHT Under all conditions Measure voltage to ground:
      There should be battery voltage.
      • Blown No. 16 (15 A) fuse in the under-hood fuse/relay box
      • 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 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 (15 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:
      The hatch lock actuator should lock [unlock].
      • Blown No. 16 (15 A) fuse in the under-hood fuse/relay box
      • Faulty hatch 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
      K2 BLU/ORN Disconnect the keyless receiver unit 5P connector 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.      		 An open in the wire
      Check for continuity to ground:
      There should be no continuity.      		 Short to ground in the wire
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