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Multiplex Control Unit Input Test

NOTE: Before continuing with the multiplex control unit input test, do the multiplex troubleshooting (see TROUBLESHOOTING  ).
  1. Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTAL ).
  2. Disconnect the under-dash fuse/relay box connectors C, E, F, J, K, O, P, Q, X and Y.
    NOTE: All connectors are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors C, E, F, J, K, O, P, Q, X and Y
    G03679867Courtesy 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 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.
    TROUBLESHOOTING

    Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
    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
    Y6 BLK Under all conditions Check for voltage to ground: There should be less than 1 V.
    • Poor ground (G502)
    • An open in the wire
    J2 WHT/RED Under all conditions Check for 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
    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 GRY/BLK Front passenger's door open Check for voltage to ground: There should be less than 1 V.
    • Faulty front passenger's door switch
    • An open in the wire
    Front passenger's door closed Check for voltage to ground: There should be 5 V or more.
    • Faulty front passenger's door switch
    • Short to ground
    Q2 GRN/WHT Rear door open Check for voltage to ground: There should be less than 1 V.
    • Poor ground (G751, G771, G551, G553)
    • Faulty rear door switch
    • An open in the wire
    Rear door closed Check for voltage to ground: There should be 5 V or more.
    • Faulty rear door switch
    • Short to ground
    Q8 : C8 : F1 GRN/ORN GRN/RED Parking brake lever pulled Check for voltage to ground: There should be less than 1 V.
    • Faulty parking brake switch
    • An open in the wire
    Parking brake lever released Check for voltage to ground: There should be about 5 V or more.
    • Faulty parking brake switch
    • Short to ground
    Q5 BLU/RED Ignition switch ON (II), driver's seat belt is unbuckled. Check for voltage to ground: There should be less than 1 V.
    • Faulty driver's seat belt switch
    • Poor ground(G552)
    • An open in the wire
    Ignition switch ON (II), driver's seat belt is buckled. Check for voltage to ground: There should be 5 V or more.
    • Faulty driver's seat belt switch
    • Short to ground
    P18 RED Hatch or tailgate open Check for voltage to ground: There should be less than 1 V.
    • Faulty hatch latch or tailgate latch switch
    • An open in the wire
    Hatch or tailgate closed Check for voltage to ground: There should be 5 V or more.
    • Faulty hatch latch or tailgate latch switch
    • Short to ground
    X5 RED/WHT Ignition key is in the ignition switch. Check for voltage to ground: There should be less than 1 V.
    • Faulty ignition key switch
    • Poor ground (G401)
    • An open in the wire
    Ignition key is out of 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 With all doors closed Attach to ground: The ignition key light should come on.
    • Blown No. 3 (7.5 A) fuse in the under-hood fuse/relay box
    • Faulty ignition key light (LED)
    • An open in the wire
    O7 GRN/RED Ceiling light switch in the middle position, all doors closed Attach to ground: The front ceiling light should come on.
    • Blown No. 3 (7.5 A) fuse in the under-hood fuse/relay box
    • Faulty front ceiling light
    • An open in the wire
    C11 BLU Under all conditions Attach to ground: Dash lights should come on.
    • Blown No. 2 (15 A) fuse in the under-hood fuse/relay box
    • Faulty taillight relay
    • An open in the wire
    F8 GRN/RED Parking brake released, disconnect the brake fluid level switch 2P connector, and jump the GRN/RED and BLK wires. Check for voltage to ground: There should be less than 1 V. An open in the wire
    Parking brake released, brake fluid level switch connector disconnected, jumper wire removed. Check for voltage to ground: There should be 5 V or more. Short to ground
    E10 YEL All doors and tailgate closed, ignition key removed Check for voltage to ground: There should be battery voltage in the sleep mode and 3-7 volts when awake. An open or short in the wire
    K10 WHT/GRN
    K2(1) BLU/ORN Under all conditions Check for continuity between the K2 terminal and the keyless receiver unit 5P connector No. 2 terminal. (Disconnect connector K and the 5P connector): There should be continuity. An open in the wire
    Y1 BRN/YEL ABS control unit-modulator disconnected Check for continuity between the Y1 terminal and the No. 13 terminal of the ABS modulator-control unit: There should be continuity. An open in the wire
    F9 BLU/WHT Air conditioning switch OFF Check for voltage to ground: There should be about 5 V or more. Short to ground
    (1) '04-06 EX and '06 EX-P models
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