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

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required 

MPCS (MCIC) service connector 07WAZ-001010A

Test Mode 1 

Check the PCM for DTCs and troubleshoot 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 No 12 (7 5 A) fuse in the driver's under-dash fuse/relay box

    2. Are the fuses OK? 

    YES  -Go to step 2

    NO  -Find and repair the cause of the blown fuse

  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 ceiling light switch to the middle (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: Identifying MPCS Service Connector And MICU Service Connector Socket
    G05988851Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Wait 5 seconds, and watch the ceiling light When the ceiling light flashes 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 GENERAL TROUBLESHOOTING INFORMATION )
    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 reinsert it to enter Mode 2 When the system enters Mode 2, the ceiling light will flash two times quickly and then go off
    NOTE: If the MPCS service connector is disconnected for too short or too long, or if the ignition switch is turned to LOCK (0), or if the vehicle is in OFF mode The system will return 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 ceiling light will blink once If the circuit is faulty, there will be no indication

Driver's MICU 

DRIVER'S MICU ITEM CHART

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
Wiper motor park position (Auto stop)
Driver's seat heater switch (LO)
Driver's seat heater switch (HI)
Rear defogger switch

Passenger's MICU 

PASSENGER'S MICU ITEM CHART

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 

DOOR MULTIPLEX CONTROL UNIT ITEM CHART

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 lock key cylinder switch (UNLOCK)(1)
Driver's door lock 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 

FRONT PASSENGER'S POWER WINDOW SWITCH ITEM CHART

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 

POWER SEAT CONTROL UNIT ITEM CHART

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)

Does the ceiling light work properly in all switch positions? 

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

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

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