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Home >> Infiniti >> 2006 >> Q45 >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> Brake Signal Circuit >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK CAN COMMUNICATION LINE 

    Perform the self-diagnosis. Refer to "SELF-DIAGNOSTIC RESULT MODE ", "DIAGNOSTIC PROCEDURE WITHOUT CONSULT-II ".

    Is a malfunction in the CAN communication indicated in the results? 

    1. YES : Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".
    2. NO : GO TO 2.
  2. CHECK STOP LAMP SWITCH CIRCUIT 

    With CONSULT-II 

    1. Turn ignition switch ON. (Do not start engine.)
    2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
    3. Read out ON/OFF switching action of the "BRAKE SW".
      TERMINAL CONTINUITY CHART

      Item name Condition Display value
      BRAKE SW Depressed brake pedal. ON
      Released brake pedal. OFF
      Fig 1: CONSULT II Display - Data Monitor
      G04075499Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK : INSPECTION END 
    2. NG : GO TO 3.
  3. CHECK STOP LAMP SWITCH 

    Check continuity between stop lamp switch harness connector terminals. Refer to "WIRING DIAGRAM - AT - NONDTC ".

    CONTINUITY CONDITION CHART

    Condition Continuity
    When brake pedal is depressed Yes
    When brake pedal is released No
    Fig 2: Checking Continuity Between Stop Lamp Switch Harness Connector Terminals
    G04128106Courtesy of NISSAN MOTOR CO., U.S.A.

    Check stop lamp switch after adjusting brake pedal - refer to " BRAKE PEDAL  "  .

    OK or NG 

    1. OK : Check the following. If NG, repair or replace damaged parts.
      • Harness for short or open between battery and stop lamp switch.
      • Harness for short or open between stop lamp switch and combination meters.
      • 10 A fuse (No.17, located in fuse block No.1)
    2. NG : Repair or replace the stop lamp switch.