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Control Unit Input Test

  1. Before testing, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
  2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
  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.
      Fig 1: Identifying Multiplex Control System Connector Terminals
      G04247144Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the following input tests at the appropriate connectors on the back of the driver's under-dash fuse/relay box. For driver's under-dash fuse/relay box connector socket location (see DRIVER'S 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.
      REFERENCE CHART (DRIVER'S MULTIPLEX CONTROL UNIT CONNECTED TO THE DRIVER'S UNDER-DASH FUSE/RELAY BOX)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      B11(1) BLK Under all conditions Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G501)
      • An open in the wire
      E3 GRN/ORN 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
      M9 BLU/BLK Ignition key is in the ignition switch Check for voltage to ground:
      There should be less than 1 V.
      • Faulty ignition 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 switch
      • Short to ground
      M3 RED/BLK Combination light switch ON Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 10 (15 A) fuse in the passenger's under-dash fuse/relay box
      • Faulty taillight relay
      • Faulty combination light switch
      • Faulty driver's under-dash fuse/ relay box
      • An open in the wire
      (1) Multiplex control unit connector B
  5. Remove the driver's multiplex control unit from the driver's multiplex control unit and make these input tests at the connector and driver's under-dash fuse/relay box sockets.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to GAUGE CONTROL MODULE INPUT TEST  (see ).
      REFERENCE CHART (DRIVER'S MULTIPLEX CONTROL UNIT DISCONNECTED TO THE DRIVER'S UNDER-DASH FUSE/RELAY BOX)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      A24 Fuse/relay box socket Ignition switch ON (II) Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box
      • Faulty driver's fuse/relay box
      A12 Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box
      • An open in the wire
      A1 Under all conditions Attach to ground:
      The ignition key light should come on.
      • Blown No. 47 (20 A) fuse in the under-hood fuse/relay box
      • Faulty ignition key light
      • An open in the wire
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