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Home >> Infiniti >> 2006 >> M35 Base >> 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? 

    YES: Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE ".

    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".
    BRAKE SW CONDITION - DISPLAY VALUE

    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 

    OK: INSPECTION END 

    NG: GO TO 3.

  3. CHECK STOP LAMP SWITCH 

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

    STOP LAMP SWITCH CONTINUITY

    Condition Continuity
    When brake pedal is depressed Yes
    When brake pedal is released No
    Fig 2: Identifying Continuity Between Stop Lamp Switch Connector Terminals
    G04139254Courtesy of NISSAN MOTOR CO., U.S.A.

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

    OK or NG 

    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 unified meter and A/C amp.
    • 10A fuse (No.20, located in fuse block).

    NG: Repair or replace the stop lamp switch.

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