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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 B, F, G, J, X and Y.
    NOTE: All connectors are wire side of female terminals.
    Fig 1: Identifying Control Unit Connector Terminals
    G03676530Courtesy 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.
      INPUT TEST (1 Of 3)

      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
      B1
      F6      		 WHT/BLU Ignition switch ON (II) and washer switch ON Check for voltage to ground: There should be battery voltage.
      Check windshield washer motor operation: The washer motor should run.
      • Poor ground (G301)
      • Blown No. 20 (20 A) fuse in the under-dash fuse/relay box
      • Faulty windshield wiper/washer switch
      • Faulty windshield washer motor
      • An open in the wire
      B6 BLU/RED Ignition switch ON (II), wiper switch in OFF or INT Check for voltage to ground: There should be battery voltage.
      • Blown No. 20 (20 A) fuse in the under-dash fuse/relay box
      • Faulty windshield wiper/washer switch
      • Faulty windshield wiper motor
      • An open in the wire
      Ignition switch ON (II), wiper switch in OFF or INT, jump B6 to ground Check windshield wiper motor operation: The wiper motor should run at low speed.
      G7 BLU/WHT Ignition switch ON (II) and wipers in park position Check for 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
      X7 BLU/BLK Ignition switch ON (II) and wiper switch in INT Check for voltage to ground: There should be battery voltage.
      • Blown No. 20 (20 A) fuse in the under-dash fuse/relay box
      • Faulty windshield wiper/washer switch
      • An open in the wire
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