DTC P0724 Brake Switch "B" Circuit High: Wiring Diagram

See WIRING DIAGRAM .

1. READ VALUE OF DATA LIST (STP SIGNAL) 

   HINT:

   According to the DATA LIST displayed by the intelligent tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten 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) position.
   4. Turn on the tester.
   5. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST".
   6. According to the display on the tester, read the "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 depressed: 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 or not.

   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 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Switch position	Tester Connection	Specified Condition
      Switch pin free	1 - 2	Below 1 Ω
      Switch pin pushed in		10 kΩ or higher
      Switch pin free	3 - 4	10 kΩ or higher
      Switch pin pushed in		Below 1 Ω

      Fig 1: Inspecting Stop Light Switch Assembly

      Courtesy 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 - ECM) 
   1. Install the stop light switch assembly.
   2. Disconnect the ECM connector.
   3. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Condition	Tester Connection	Specified Condition
      Brake pedal is depressed	A6-4 (STP) - Body ground	10 to 14 V
      Brake pedal is released		Below 1 V

      Fig 2: Identifying ECM A6 Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM