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Home >> Infiniti >> 2005 >> 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".
      Fig 1: Item Name And Display Value Chart
      G02381721Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Display Data Monitor Mode Screen
      G02381722Courtesy 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 ".

    STOP LAMP SWITCH CONNECTOR TERMINALS CONTINUITY

    Condition Continuity
    When brake pedal is depressed Yes
    When brake pedal is released No

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

    Fig 3: Checking Continuity Between Stop Lamp Switch Harness Connector Terminals
    G02381723Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: 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.
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