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To Enter Mode 2

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. From Mode 1, disconnect the special tool from the multiplex control system (MPCS) inspection connector for between 5 and 10 seconds, then reconnect it. The ignition key light should come on and the beeper should beep for 2 seconds, then blink/beep twice more at 0.2-second intervals. This indicates the system has entered Mode 2.

    Mode 2: Ignition key Light and Beeper 

    Fig 1: Identifying Ignition Key Light And Beeper Blinking Pattern
    G03642321Courtesy of AMERICAN HONDA MOTOR CO., INC.
    NOTE: To cancel Mode 2, disconnect the MPCS service connector from the multiplex control inspection connector for more than 10 seconds or turn the ignition switch OFF.
  2. Operate the switches as described in the charts below.
    NOTE:
    • A second key is necessary to test the key cylinder switch. If only one key is available, cut a second key from a non-immobilizer type key blank for the test.
    • When testing the door lock knob switches, make sure all three passenger doors are locked. After unlocking the door, make sure to return the door lock knob switch to the lock position, otherwise the test results will be inaccurate.
    • If you continue to hold the power mirror and power seat controls (with DPMS), you will hear beeps as they move through position sensors.
    PASSENGERS MULTIPLEX CONTROL UNIT

    Passenger's Multiplex Control Unit
    Test all the switches in the following order, otherwise the test results maybe inaccurate:
    Front passenger's door lock knob switch (UNLOCK)
    Front passenger's door lock switch (LOCK/ UNLOCK)
    Front passenger's door switch (OPEN)
    Right rear door switch (OPEN)
    Right rear door lock knob switch (UNLOCK)
    Power mirror switch (with DPMS)
    Security input for the radio or navigation system, RES display, or RES DVD player
    Test by disconnecting and reconnecting the radio, navigation system, RES display, or RES
    DVD player connectors
    DRIVERS MULTIPLEX CONTROL UNIT

    Driver's Multiplex Control Unit
    Dash lights brightness controller (ROTATE)
    Driver's door switch (OPEN)
    Left rear door switch (OPEN)
    Left rear door lock knob switch (UNLOCK)
    Tailgate latch switch (OPEN)
    Driver's seat belt switch (UNBUCKLED)(1)
    Windshield wiper switch (in AUTO on Touring or in INT on non-Touring
    Brake pedal position switch (Brake switch) (PRESSED)
    Parking brake switch (ON)
    Hood switch (OPEN)
    Combination switch (ON) parking lights/head lights
    (1) '03 model
    DOOR MULTIPLEX CONTROL UNIT

    Door Multiplex Control Unit
    Test all the switches in the following order,
    otherwise the test results maybe inaccurate:
    Driver's door lock knob switch (LOCK)
    Driver's key cylinder switch (LOCK)
    Driver's door lock knob switch (UNLOCK)
    Driver's key cylinder switch (UNLOCK)
    Driver's door lock switch (LOCK/UNLOCK)
    Power window master switch (for the passenger's windows, not the driver's window) Driving position memory switch (memo, position 1, and position 2) (Touring only)
    DRIVER'S POWER SEAT CONTROL UNIT (WITH DPMS)

    Driver's Power Seat Control Unit (with DPMS)
    Driver's power seat switch (front up/down, rear up/down, side forward/backward, recline forward/backward

    Did the multiplex control system confirm all the circuits by flashing the ignition key light and sounding the beeper? 

    1. YES  - The multiplex system is OK, if the symptom is still present, go to the input test for the system with the problem (see chart below), or refer to multiplex input test (see MULTIPLEX CONTROL UNIT INPUT TEST  ).
      SYSTEM

      System
      Power door locks (see KEYLESS RECEIVER UNIT INPUT TEST )
      Security (Touring) (see KEYLESS RECEIVER UNIT INPUT TEST )
      Keyless (Touring) (see KEYLESS RECEIVER UNIT INPUT TEST )
      Power windows (Includes key-off timer operation) (see CONTROL UNIT INPUT TEST )
      Entry light control, Key light timer (see CONTROL UNIT INPUT TEST )
      Wiper controls (front and rear) (see WITHOUT AUTOMATIC WIPER )
      Automatic lights off (Touring) (see AUTOMATIC LIGHTING CONTROL UNIT INPUT TEST )
      Reminder chimes (see CONTROL UNIT INPUT TEST ) (key-in, seat belt, lights-on) (see GAUGE INPUT TEST )(1)
      Dash lights brightness control (see CONTROL UNIT INPUT TEST )
      Engine oil pressure indicator (see CONTROL UNIT INPUT TEST )
      (1) '04-'06 models
    2. NO  - Find the open or short in the circuit that was not confirmed by the multiplex control system. If the circuit is OK, replace the multiplex control unit that monitors the circuit.
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