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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Automatic Transaxle) >> Automatic Transmission System >> DTC P0724: Brake Switch "B" Circuit High >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

HINT.

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time

NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
  1. Warm up the engine
  2. Turn the engine switch off.
  3. Connect the Techstream to the DLC3.
  4. Turn the engine switch on (IG).
  5. Turn the Techstream on.
  6. Enter the following menus. Powertrain / ECT / Data List.
  7. According to the display on the Techstream, read the Data List.

TCM 

DATA LIST REFERENCE

Tester Display Measurement Item/Range Normal Condition Diagnostic Note
Stop Light Switch Stop light switch status/
ON or OFF		 Brake pedal is
  • ON Depressed
  • OFF Released
 -
  1. INSPECT STOP LIGHT SWITCH 
    1. Remove the stop light switch
    2. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      1-2 Pin not pushed Below 1 Ω
      3-4 Pin pushed Below 1 Ω
      1-2 Pin pushed 10 kΩ or higher
      3-4 Pin not pushed 10 kΩ or higher
      3. Fig 1: Inspecting Stop Light Switch
      G04948321Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE STOP LIGHT SWITCH 

    OK: Go to next Step 

  2. CHECK STOP LIGHT SWITCH (POWER SOURCE) 
    1. Disconnect the stop light switch connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A22-2 - Body ground Always 11 to 14 V
      3. Fig 2: Identifying Stop Light Switch Connector Terminal
      G05750722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to next Step 

  3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - TCM) 
    1. Connect the stop light switch connector.
    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 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A58-23 (STP) - Body ground Brake pedal is depressed 11 to 14 V
      Brake pedal is released Below 1 V
      4. Fig 3: Identifying A58 TCM Connector Terminal
      G05750723Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  4. REPLACE TCM 
    1. Replace the TCM (See REMOVAL  ).

    NEXT: PERFORM A/T CODE REGISTRATION  (See REGISTRATION  )

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