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Mode 1 Test

  1. Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTAL ).
  2. Check the No. 9 (10 A) fuse in the under-hood fuse/ relay box and the No. 10 (7.5 A) fuse in the under-dash fuse/relay box.

    Are the fuses OK? 

    1. YES -  Go to step 3.
    2. NO -  Find and repair the cause of the blown fuse.
  3. Turn the ignition switch ON (II).

    If the driver's seat belt is unbuckled, the seat belt reminder will chime 6 times.

  4. Set the ceiling light to the center position and close all the doors.
  5. Connect the special tool (A) to the multiplex control inspection connector (B).
    Fig 1: Connecting Special Tool To Multiplex Control Inspection Connector
    G03676518Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. After about 5 seconds, the front ceiling light should come on for 2 seconds, go out, then blink on for 0.2 second to show the system is now in Mode 1.

    MODE 1: 

    Fig 2: Identifying Blinking Pattern Of Ceiling Light
    G03676519Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Did the front ceiling light indicate Mode 1 ? 

    1. YES -  Go to step  8 .
    2. NO -  Go to step 7.
  7. Check for continuity between No. 4 terminal of the under-dash fuse/relay box connector J and body ground.

    Is there continuity? 

    1. YES -  Replace the under-dash fuse/relay box.
    2. NO -  Repair the open in the wire. If the wire is OK, repair G301.
  8. If there are any DTCs present, the front ceiling light will blink to indicate the DTC(s). If more than one DTC is present, the DTCs will be displayed in ascending order. If there are no DTCs, the front ceiling light will not blink again after the Mode 1 indication.

    Are there any DTCs? 

    1. YES -  Go to step 9.
    2. NO -  Go to the Mode 2 test (see MODE 2 TEST  ).
  9. Troubleshoot the DTC(s) in the order indicated using the following charts.

    If a faulty control unit is suspected, substitute it with a known good part and recheck for DTCs.

    • If the DTC(s) is still present, go to the next step listed for the DTC.
    • If the DTC(s) is no longer present replace the original part.

    Individual DTCs 

    INDIVIDUAL DTCS TROUBLESHOOTING

    Multiplex DTC Probable Cause
    1 The multiplex control unit cannot receive signals from the gauge assembly.
    1. Faulty power or ground to the gauge assembly
    2. Faulty gauge assembly
    3. Faulty under-dash fuse/relay box
    2 The multiplex control unit cannot receive signals from the ECM/PCM(1)
    1. Faulty power or ground to the ECM/PCM(1)
    2. Faulty ECM/PCM(1)
    3. Faulty under-dash fuse/relay box
    3 Internal failure of the multiplex control unit
    1. Faulty under-dash fuse/relay box
    5 The gauge assembly cannot receive signals from the multiplex control unit and the ECM/PCM (1)
    1. Faulty power or ground to the gauge assembly
    2. Faulty gauge assembly
    6 The ECM/PCM(1) cannot receive signals from the multiplex control unit and the gauge assembly
    1. Faulty power or ground to the ECM/PCM(1)
    2. Faulty ECM/PCM(1)
    (1) Before replacing a faulty ECM/PCM, make sure it has the latest software revision. Update if necessary before swapping or replacing.

    Multiple DTCs 

    MULTIPLE DTCS TROUBLESHOOTING

    Multiplex DTC Probable Cause
    1,2,3 and ECM/PCM DTC P0600 Simultaneously Short to ground on one of the communication wires
    1. Short to ground on the YEL wire between the ECM/PCM terminal E13 and the under-dash fuse/relay box terminal E10
    2. Short to ground on the GRY/RED wire between the gauge assembly terminal A1 and under-dash fuse/ relay box terminal K10
    3. Short to ground on the BLU/ORN wire between the keyless receiver unit terminal No. 2 and the under-dash fuse/relay box terminal K2.
    1 and 6 Simultaneously Open in the communication wire
    1. Open in GRY/RED wire between the under-dash fuse/relay box terminal K10 and the gauge assembly terminal A1
    2 and 5 Simultaneously Open in the communication wire
    1. Open in the YEL wire between the under-dash fuse/relay box terminal E10 and ECM/PCM terminal E13
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