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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/INSTAL ).
  3. Disconnect the under-dash fuse/relay box connectors O, Q, X and Y.
    NOTE: All connectors are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors O, Q, X And Y
    G03679792Courtesy 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 look OK, go to step 5.
  5. With the connectors still disconnected, 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.
    TEST CONDITION DISCONNECTED

    Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
    O7 GRN/RED Ceiling light switch in middle position, all doors closed Attach to ground: Ceiling light(s) should come on.
    • Blown No. 3 (7.5 A) fuse in the under-hood fuse/relay box
    • Blown bulb
    • Faulty ceiling light
    • An open in the wire
    X8 WHT/BLK Under all conditions Attach to ground: 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
  6. 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.
TEST CONDITION RECONNECTED

Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
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 Any rear door open Check for voltage to ground: There should be less than 1 V.
  • Faulty left (right) rear door switch
  • An open in the wire
Both rear doors closed Check for voltage to ground: There should be 5 V or more.
  • Faulty left (right) rear door switch
  • Short to ground
X5 RED/WHT Ignition key inserted into the ignition switch Check for voltage to ground: There should be less than 1 V.
  • Poor ground (G401)
  • Faulty ignition key switch
  • An open in the wire
Ignition key removed from the ignition switch Check for voltage to ground: There should be 5 V or more.
  • Faulty ignition key switch
  • Short to ground
Y8 YEL/RED Driver's door lock knob switch locked Check for voltage to ground: There should be less than 1 V.
  • Poor ground (G501)
  • Faulty driver's door lock knob switch
  • An open in the wire
Driver's door lock knob switch unlocked Check for voltage to ground: There should be 5 V or more.
  • Faulty driver's door lock knob switch
  • Short to ground
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