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Stop Lamp Switch Check

WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK STOP LAMP SWITCH INPUT SIGNAL 
    1. Turn ignition switch OFF.
    2. Disconnect Intelligent Key unit connector.
    3. Check voltage between Intelligent Key unit harness connector M52 terminal 26 and ground.
      STOP LAMP SWITCH INPUT SIGNAL

      Connector Terminals Condition Voltage (V) (Approx.)
      (+) (-)
      M52 26 Ground Brake pedal depressed Battery voltage
      Brake pedal released 0
      Fig 1: Checking Voltage Between Intelligent Key Unit Harness Connector M52 Terminal 26 And Ground
      G04916866Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Stop lamp switch is OK.

    NG: GO TO 2.

  2. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 

    Check voltage between stop lamp switch harness connector E38 terminal 1 and ground.

    1 - Ground: Battery voltage 

    Fig 2: Checking Voltage Between Stop Lamp Switch Harness Connector E38 Terminal 1 And Ground
    G04916867Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace harness between stop lamp switch power supply circuit and fuse.

  3. CHECK STOP LAMP SWITCH OPERATION 

    Check continuity between stop lamp switch terminals 1 and 2.

    STOP LAMP SWITCH OPERATION

    Component Terminals Condition Continuity
    Stop lamp switch 1 2 Brake pedal depressed Yes
    Brake pedal not depressed No
    Fig 3: Checking Continuity Between Stop Lamp Switch Terminals 1 And 2
    G04916868Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 4.

    NG: Replace stop lamp switch.

  4. CHECK STOP LAMP SWITCH CIRCUIT 
    1. Check continuity between Intelligent Key unit harness connector (A) M52 terminal 26 and stop lamp switch harness connector (B) E38 terminal 2.

      26 - 2: Continuity should exist. 

    2. Check continuity between Intelligent Key unit harness connector M52 terminal 26 and ground.

      26 - Ground: Continuity should not exist. 

    Fig 4: Checking Continuity Between Intelligent Key Unit Harness Connector M52 Terminal 26 And Ground
    G04916869Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Check condition of harness and connector.

    NG: Repair or replace harness.

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