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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 Under-Dash Fuse/Relay Box Connectors
    G03653194Courtesy 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, go to step 6.
      CONTROL UNIT INPUT TEST POSSIBLE CAUSE

      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 1 V or less.
      • Poor ground (G301)
      • An open in the wire
      Y6 BLK Under all conditions Check for voltage to ground:
      There should be 1 V or less.
      • Poor ground (G401)
      • 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 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, jump B6 to ground Check for voltage to ground:
      There should be battery voltage.
      Check wiper motor operation:
      The wiper motor should run at low speed.
      • 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 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 wiper/washer switch
      • An open in the wire
  6. Disconnect the X connector from the under-dash fuse/relay box, and make this input test at the connector.

    If this input test proves OK, the multiplex control unit must be faulty; replace the under-dash fuse/relay box assembly.

    UNDER-DASH FUSE/RELAY BOX SPECIFICATION

    X3 GRN/ORN Intermittent dwell time control ring turned Check for resistance between the terminals:
    It should vary from 0 to 30 kohm as the ring is turned.
    • Faulty intermittent dwell time controller
    • An open in the wire
    X4 GRN/WHT
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