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. Warm up the engine.
2. Turn the ignition switch off.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn on the Techstream.
6. Select the item "Powertrain / Engine and ECT / Data List".
7. According to the display on the tester, read the "Data List".

   Tester Display	Measurement Item/Range (display)	Normal Condition	Diagnostic Note
   Stop Light Switch	Stop light Switch Status/ ON or OFF	Brake pedal is depressed: ON Brake pedal is released: OFF	-

   NOTE:

   In the table below, the value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether apart is faulty or not.

   RESULT

   
   

   Result	Proceed to
   NG	A
   OK	B

B → See step   3 

A: Go to next step 

1. Remove the stop light switch assembly.
   Fig 1: Inspecting Stop Light Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

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

NG → See step   5 

OK: Go to next step 

1. Install the stop light switch assembly.
   Fig 2: Checking A37 ECM Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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

   Condition	Tester Connection	Specified Condition
   A37-36 (STP) - Body ground	Brake pedal is depressed	11 to 14 V
   	Brake pedal is released	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4