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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle >> Automatic Transmission System >> DTC P0724 Brake Switch "B" Circuit High >> Inspection Procedure

Inspection Procedure

HINT:

Using the intelligent tester or Techstream DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save 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 intelligent tester or Techstream to the DLC3.
  4. Turn the engine switch on (IG).
  5. Turn the tester ON.
  6. Enter the following menus:

    Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / ECT / DATA LIST.

    Techstream - Select: Powertrain / ECT / Data List.

  7. Follow the instructions on the tester and read the DATA LIST.

    Intelligent tester

    TCM: 

    TCM TERMINALS REFERENCE

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    STOP LIGHT SW Stop light switch status/ ON or OFF Brake pedal is
    • ON: Depressed
    • OFF: Released
    		 -

    Techstream

    TCM: 

    TCM TERMINALS 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 
    Fig 1: Checking Stop Light Switch
    G04948321Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the A35 stop light switch.
    2. Measure the resistance of the stop light switch.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      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

    NG: REPLACE STOP LIGHT SWITCH  (See REMOVAL )

    OK: GO TO NEXT STEP 

  2. CHECK STOP LIGHT SWITCH (POWER SOURCE) 
    Fig 2: Checking Stop Light Switch (Power Source)
    G04948322Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A35 stop light switch connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A35-2 - Body ground Always 11 to 14 V

    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) 
    Fig 3: Checking Harness And Connector (Stop Light Switch - TCM)
    G04948323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A35 stop light switch connector.
    2. Disconnect the A12 TCM connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A35-1 -A12-2(STP) Always Below 1 Ω
      A35-1 or A12-2(STP)-Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

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

    NEXT: PERFORM AT REGISTRATION (See  REGISTRATION   ) 

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