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Home >> Toyota >> 2019 >> Sienna SE, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Control System [2GR-FE] - Diagnostic Codes (2 Of 3)) >> SFI System >> DTC P0504: Brake Switch "A" / "B" Correlation [12/2015 - 08/2016] >> Procedure

DTC P0504: Brake Switch "A" / "B" Correlation [12/2015 - 08/2016]: Procedure

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  1. CHECK SPECIFICATIONS 

    Check the vehicle specifications.

    RESULT

    Result Proceed to
    for Bulb Type Stop Light A
    for LED Type Stop Light B

    Result: 

    B 

    See step  3

    Result: 

    A 

    See step  2

  2. CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE) 
    1. Disconnect the stop light switch assembly connector.
      GTY739847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A58-2 - Body ground Always 11 to 14 V
      A58-4 - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
      RESULT

      Result Proceed to
      NG A
      OK B

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY) 

    Result: 

    B 

    See step  4

  3. CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL VOLTAGE) 
    1. Disconnect the stop light switch assembly connector.
      GTY712050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A59-2 (B) - Body ground Always 11 to 14 V
      A59-5 (B) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY) 

    Result: 

    OK 

    See step  4

  4. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Inspect the stop light switch assembly (for Bulb Type Stop Light) (Refer to PROCEDURE - Step 1 ).
    2. Inspect the stop light switch assembly (for LED Type Stop Light) (Refer to PROCEDURE - Step 1 ).

    Result: 

    NG 

    REPLACE STOP LIGHT SWITCH ASSEMBLY 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    OK 

    See step  5

  5. CHECK ECM (STP AND ST1 - VOLTAGE) 
    1. Disconnect the ECM connector.
      GTY721480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Brake Pedal Depressed *b Brake Pedal Released
      *c Front view of wire harness connector
      (to ECM)      		 - -
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Brake Pedal Operation Specified Condition
      A39-35 (ST-) - Body ground Released 7.5 to 14 V
      Depressed 0 to 1.5 V
      A39-36 (STP) - Body ground Released 0 to 1.5 V
      Depressed 7.5 to 14 V

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) 

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