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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1708 (Body, Lock & Security System (Coupe)) >> Intelligent Key System >> Check Stop Lamp Switch
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Check Stop Lamp Switch

WARNING: This page is about a different car, the 2006 Infiniti G35. 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 M75 terminal 26 and ground.
      TERMINALS VOLTAGE REFERENCE

      Connector Terminal (wire color) Condition Voltage (V) (Approx.)
      (+) (-)
      M75 26 (P/L) Ground Brake pedal depressed Battery voltage
      Brake pedal released 0
      Fig 1: Identifying Voltage Between Intelligent Key Unit Harness Connector M75 Terminal 26 And Ground
      G04182018Courtesy 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 E124 terminal 3 and ground.

    3 (R/Y) - Ground: Battery voltage 

    OK or NG 

    OK: GO TO 3.

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

    Fig 2: Identifying Voltage Between Stop Lamp Switch Connector E124 Terminal 3 And Ground
    G04182019Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK STOP LAMP SWITCH OPERATION 

    Check continuity between stop lamp switch connector E124 terminal 3 and 4.

    TERMINALS CONTINUITY REFERENCE

    Connector Terminal Condition Continuity
    E124 3 4 Brake pedal depressed Yes
    Brake pedal not depressed No
    Fig 3: Identifying Continuity Between Stop Lamp Switch Connector E124 Terminal 3 And 4
    G04182020Courtesy 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 M75 terminal 26 and stop lamp switch harness connector E124 terminal 4.

      26 (P/L) - 4 (P/L): Continuity should exist  .

    2. Check continuity between Intelligent Key unit harness connector M75 terminal 26 and ground.

      26 (P/L) - Ground: Continuity should not exist  .

    OK or NG 

    OK: Check condition of harness and connector.

    NG: Repair or replace harness.

    Fig 4: Identifying Continuity Between Intelligent Key Unit Connector M75 Terminal 26 And Ground
    G04182021Courtesy of NISSAN MOTOR CO., U.S.A.
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