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Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)

Special Tools Required 

MPCS (MCIC) Service Connector 07WAZ-001010A

Test Mode 1 

Check the ECM/PCM for DTCs and troubleshoot ECM/PCM (see GENERAL TROUBLESHOOTING INFORMATION ) or F-CAN loss of communication errors first, then do this diagnosis if the HDS is not available.

  1. Check the No. 15(10 A) fuse in the under-hood fuse/relay box and the No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box.

    Are the fuses OK? 

    YES  - Go to step 2.

    NO  - Replace the fuses. If the fuse blows again, repair the short to ground on the fuse circuit(s).

  2. Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ).
  3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and move the interior lights switch to the DOOR position.
  4. Connect the MPCS service connector (A) to the MICU service check connector socket (B) in the driver's under-dash fuse/relay box.
    Fig 1: Connecting MPCS Service Connector To MICU Service Check Connector Socket In Driver's Under-Dash Fuse/Relay Box
    G08071249Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Wait 5 seconds, and watch the front individual map lights and rear individual map lights. When the front individual map lights and rear individual map lights flash quickly once and then goes off, the system is in Test Mode 1.
  6. Check for B-CAN DTCs indicated by the multi-information display (MID) on the gauge control module while still in Test Mode 1. Press the SEL/RESET button to display the next code. After you get to the last code, the display shows END. If no DTCs are stored, the display will read NO (see HOW TO DISPLAY DTCS ON THE MID OF THE GAUGE CONTROL MODULE  ).
    NOTE: If the test times out, remove the MPCS service connector, turn the ignition switch to LOCK (0), and repeat steps  3 and  4.

    Are any DTCs indicated? 

    YES  - Go to step 7.

    NO  - Go to step  9.

  7. Record all DTCs and troubleshoot them in this order:
    • Battery voltage DTCs
    • Internal error DTCs
    • Loss of communication DTCs
    • Signal error DTCs
  8. Clear the DTCs by pressing and holding the SEL/RESET button for about 10 seconds.
  9. You will hear a beep to confirm the codes have been cleared. Operate the devices that failed, and recheck for codes.

    Test Mode 2 

  10. Remove the MPCS service connector from the driver's under-dash fuse/relay box MICU service check connector socket for 5-10 seconds, then re-insert it to enter Mode 2. When the system enters Mode 2, the front individual map lights and rear individual map lights flash two times quickly and then goes off.
    NOTE: If the MPCS service connector is disconnected for too short or too long of a time, or if the ignition switch is turned to LOCK (0), or if the vehicle is in OFF mode, the systems returns to Test Mode 1.
  11. The following tables list the circuits that can be checked in Test Mode 2. Operate the switch that is most closely related to the problem. If the circuit is OK, the front individual map lights and rear individual map lights blink once. If the circuit is faulty, there is no indication.
    DRIVER'S MICU

    Item
    Brake pedal position switch (ON)
    Driver's door switch
    Left rear door switch
    Trunk lid latch switch
    Fog light switch
    Left rear door lock knob switch (UNLOCK)
    Wiper switch (HI/LO)
    Wiper switch (INT/LO)
    Wiper switch (MIST)
    Washer switch
    Wiper intermittent dwell time controller
    Turn signal switch (LEFT)
    Turn signal switch (RIGHT)
    Hazard warning switch (ON)
    Headlight switch (AUTO)
    Headlight switch (ON)
    Headlight switch (OFF)
    Lighting switch (ON)
    Dimmer switch (ON)
    Passing switch (ON)
    Trunk lid opener main switch
    Trunk lid outer handle switch
    Transmission range switch (P) (A/T)
    Ignition key switch
    Security hood switch
    Windshield wiper motor park position (Auto stop)
    Driver's seat heater switch (LO)
    Driver's seat heater switch (HI)
    Rear defogger switch
    PASSENGER'S MICU

    Item
    Front passenger's door switch
    Right rear door switch
    Right rear door lock knob switch (UNLOCK)
    Audio unit
    Front passenger's seat heater switch (LO)
    Front passenger's seat heater switch (HI)
    DOOR MULTIPLEX CONTROL UNIT

    Item
    Driver's door lock switch (UNLOCK)
    Driver's door lock switch (LOCK)
    Driver's door lock knob switch (UNLOCK)
    Driver's door lock knob switch (LOCK)
    Driver's door key cylinder switch (UNLOCK)(1)
    Driver's door key cylinder switch (LOCK)(1)
    (1) A second key is necessary to check the key cylinder inputs. Be sure to rotate the key cylinder switch two times to each position (lock and lock, unlock and unlock) to ensure the door lock knob switch is in the appropriate position.
    FRONT PASSENGER'S POWER WINDOW SWITCH

    Item
    Front passenger's door lock switch (UNLOCK)
    Front passenger's door lock switch (LOCK)
    Front passenger's door lock knob switch (UNLOCK)
    POWER SEAT CONTROL UNIT

    Item
    Transmission range switch (P) (A/T)
    Parking brake switch (M/T)
    Slide switch (Forward)
    Slide switch (Backward)
    Recline switch (Forward)
    Recline switch (Backward)
    Front UP-DOWN switch (Up)
    Front UP-DOWN switch (Down)
    Rear UP-DOWN switch (Up)
    Rear UP-DOWN switch (Down)

    Do the front individual map lights and rear individual map lights work properly in all switch positions? 

    YES  - Go to function and input test for the system related to the failure.

    NO  - Repair the open, or short, or replace the faulty switch.

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