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Home › Lexus › 2007 › ES 350 › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transaxle › Automatic Transaxle System › DTC P0724 Brake Switch "B" Circuit High › Inspection Procedure

Inspection Procedure

  1. READ VALUE OF DATA LIST (STP SIGNAL) 

    HINT:

    According to the DATA LIST displayed on the intelligent tester, you can read the value of switches, sensors, actuators and other items without removing any parts. Reading the DATA LIST as the first step in troubleshooting is one method to save labor time.

    1. Turn the engine switch off.
    2. Connect the intelligent tester together with the CAN VIM (Controller Area Network Vehicle Interface Module) to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn on the tester.
    5. Enter the following items: "DIAGNOSIS / OBD / MOBD / ECT / DATA LIST".
    6. According to the display on the tester, read "DATA LIST".

      Standard 

      DATA LIST

      Item Measurement Item/Range (display) Normal Condition
      STOP LIGHT SW Stop light switch status/ ON or OFF
      • Brake pedal is depressed: ON
      • Brake pedal is released: OFF
      NOTE: In the table above, the conditions listed under "Normal Condition" are reference conditions. Do not depend solely on these reference conditions when deciding whether a part is faulty.

    OK: Go to step  3

    NG: Go to Next Step 

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Remove the stop light switch assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Switch Position Tester Connection Specified Condition
      Switch pin free 1 - 2 Below 1 Ω
      Switch pin pushed in 1 - 2 10 kΩ or higher
      Switch pin free 3 - 4 10 kΩ or higher
      Switch pin pushed in 3 - 4 Below 1 Ω
    Fig 1: Inspecting Stop Light Switch Assembly
    G04976571Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - TCM) 
    1. Install the stop light switch assembly.
    2. Disconnect the TCM connector.
    3. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Condition Tester Connection Specified Condition
      Brake pedal is depressed B40-12 (STP) - Body ground 10 to 14 V
      Brake pedal is released B40-12 (STP) - Body ground Below 1 V
    Fig 2: TCM Connector Terminal Identification
    G05249477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE TCM 

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