DTC P0504: Brake Switch "A" / "B" Correlation; DTC P0724: Brake Switch "B" Circuit High: Procedure

1. Check whether the stop lights turn on and off normally when the brake pedal is depressed and released.

   OK

   Stop lights turn on when brake pedal is depressed.

NG → See step   6 

OK: Go to next step 

1. Remove the stop light switch assembly.
   Fig 1: Identifying Stop Light Switch Assembly & Connector Terminals

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

   Standard resistance

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

   TEXT IN ILLUSTRATION
   
   

   *1	Free
   *2	Pushed In

3. Reinstall the stop light switch assembly.

NG → REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
   Fig 2: Identifying Value Using Techstream STP Signal And ST1 - Voltage

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch on (IG) and turn the tester on.
3. Select the following menu items: Powertrain / Engine and ECT / Data List / Stop Light Switch.
4. Check the STP signal when the brake pedal is depressed and released.

   Standard

   Brake Pedal Operation	Specified Condition
   Depressed	STP signal ON
   Released	STP signal OFF

5. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Brake Pedal Operation	Specified Condition
   D61-8 (ST1-) - B49-12 (E1)	Depressed	Below 1.5 V
   D60-18 (STP) - B49-12 (E1)	Released	7.5 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Brake Pedal Depressed
   *2	Brake Pedal Released
   *a	Component with harness connected (ECM)

NG → See step   4 

OK → See step   7 

1. Disconnect the stop light switch connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Check for open 

   Check for short 

   Tester Connection	Condition	Specified Condition
   A19-1 (Stop light switch) - D60-18 (STP)	Always	Below 1 Ω
   A19-3 (Stop light switch) - D61-8 (ST1-)	Always	Below 1 Ω

   Tester Connection	Condition	Specified Condition
   A19-1 (Stop light switch) or D60-18 (STP) - Body ground	Always	10 kΩ or higher
   A19-3 (Stop light switch) or D61-8 (ST1-) - Body ground	Always	10 kΩ or higher

4. Reconnect the stop light switch connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM) 

OK → See step   5