DTC P0724: Brake Switch "B" Circuit High: Procedure

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.

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Powertrain / ECT / Data List.
6. According to the display on the Techstream, read the Data List.

   OK

   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	-

   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.

NG → See step   2 

OK → CHECK FOR INTERMITTENT PROBLEMS 

1. Check the stop light switch assembly installation. Refer to INSTALLATION .

   OK

   Stop light switch assembly is installed correctly.

NG → SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY 

OK: Go to next step 

1. Inspect the stop light switch assembly. Refer to INSPECTION .

NG → See step   6 

OK: Go to next step 

1. Install the stop light switch assembly.
   Fig 1: Checking Harness And Connector (Stop Light Switch Assembly - TCM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the stop light switch connector.
3. Disconnect the TCM connector.
4. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E7-12 (STP) - Body ground	Brake pedal is depressed	7.5 to 14 V
   E7-12 (STP) - Body ground	Brake pedal is released	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to TCM)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5