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Control Unit Input Test

  1. Before testing, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
  2. Remove the dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  3. Disconnect the under-dash fuse/relay box connectors B, F, G, J, X and Y.
    NOTE: All connectors are shown from wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
    G00482784Courtesy 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. Reconnect the connectors, and 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, the multiplex control unit must be faulty; replace the under-dash fuse/relay box assembly.
      TEST CONDITION TABLE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      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
      Y6 BLK Under all conditions Measure voltage to ground: There should be less than 0.5 V.
      • Poor ground(G502)
      • An open in the wire
      B1 WHT/GRN Ignition switch ON (II) and washer switch ON Measure voltage to ground: There should be battery voltage.
      • Blown No. 20 (20 A) fuse in the under-dash fuse/relay box
      • Faulty wiper/washer switch
      • An open in the wire
      X7 BLU/BLK Ignition switch ON (II) and wiper switch in INT Measure voltage to ground: There should be battery voltage.
      B6 BLU/RED Ignition switch ON (II), wiper switch in OFF or INT, and when the motor is not in operation. Measure voltage to ground: There should be battery voltage.
      • Blown No. 20 (20 A) fuse in the under-dash fuse/relay box
      • Faulty wiper/washer switch
      • Faulty windshield wiper motor
      • An open in the wire
      G7 BLU/WHT Ignition switch ON (II) and wipers in park position Measure voltage to ground: There should be battery voltage.
      • Blown No. 20 (20 A) fuse in the under-dash fuse/relay box
      • Faulty windshield wiper motor
      • An open in the wire
      B1
      F6      		 WHT/GRN Jump B1 to F6 terminals, then ignition switch ON (II) and washer switch ON Check windshield washer motor operation: The washer motor should run.
      • Poor ground(G201)
      • Blown No. 20 (20 A) fuse in the under-dash fuse/relay box
      • Faulty wiper/washer switch
      • Faulty windshield washer motor
      • Faulty under-dash fuse/relay box
      • An open in the wire
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