Inspection Procedure

When using intelligent tester: 

1. CHECK STOP LIGHT (OPERATION) 
   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 : REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT 

   OK : GO TO NEXT STEP 

2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
   1. Remove the stop light switch assembly.
   2. Check the resistance.

      Standard resistance 

      TESTER CONNECTION - SPECIFIED CONDITIONS
      
      

      Switch Positions	Tester Connections	Specified Conditions
      Switch pin free	1 - 2	Below 1
      Switch pin free	3 - 4	10 k or higher
      Switch pin pushed in	1 - 2	10 k or higher
      Switch pin pushed in	3 - 4	Below 1

   3. Reinstall the stop light switch assembly.

   NG : REPLACE STOP LIGHT SWITCH ASSEMBLY 

   Fig 1: Inspecting Stop Light Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : GO TO NEXT STEP 

3. READ VALUE OF INTELLIGENT TESTER (STP SIGNAL) 
   1. Connect an intelligent tester to the DLC3.
   2. Turn the ignition switch to ON and turn the tester ON.
   3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STOP LIGHT SW.
   4. Check the STP signal when the brake pedal is depressed and released.

      OK: 

      BRAKE PEDAL OPERATIONS - SPECIFIED CONDITIONS
      
      

      Brake Pedal Operations	Specified Conditions
      Depressed	STP signal ON
      Released	STP signal OFF

   OK : CHECK FOR INTERMITTENT PROBLEMS 

   Fig 2: Identifying Brake Pedal Positions

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : GO TO NEXT STEP 

4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the S7 stop light switch connector.
      Fig 3: Checking Harness And Connector (Stop Light Switch - ECM)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Disconnect the E5 ECM connector.
   3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION - SPECIFIED CONDITIONS (CHECK FOR OPEN)
      
      

      Tester Connections	Specified Conditions
      Stop light switch (S7-1) - STP (E5-19)	Below 1

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

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM 

When Using OBD II Scan Tool: 

1. CHECK STOP LIGHT (OPERATION) 
   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 : REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT 

   OK : GO TO NEXT STEP 

2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
   1. Remove the stop light switch assembly.
      Fig 4: Inspecting Stop Light Switch Assembly

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Check the resistance.

      Standard resistance 

      TESTER CONNECTION - SPECIFIED CONDITIONS (1 OF 2)
      
      

      Switch Positions	Tester Connections	Specified Conditions
      Switch pin free	1 - 2	Below 1
      Switch pin free	3 - 4	10 k or higher
      Switch pin pushed in	1 - 2	10 k or higher
      Switch pin pushed in	3 - 4	Below 1

   3. Reinstall the stop light switch assembly.

   NG : REPLACE STOP LIGHT SWITCH ASSEMBLY 

   OK : GO TO NEXT STEP 

3. INSPECT ECM (STP VOLTAGE) 
   1. Turn the ignition switch to ON.
      Fig 5: Inspecting ECM (STP Voltage)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the voltage between the terminals of the E4 and E5 ECM connectors.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITIONS (2 OF 2)
      
      

      Tester Connections	Brake Pedal Operations	Specified Conditions
      STP (E5-19) - E1 (E3-5)	Depressed	Between 7.5 V and 14 V
      STP (E5-19) - E1 (E3-5)	Released	Below 1.5 V

   OK : CHECK FOR INTERMITTENT PROBLEMS 

   NG : GO TO NEXT STEP 

4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the S7 stop light switch connector.
      Fig 6: Checking Harness And Connector (Stop Light Switch - ECM)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Disconnect the E5 ECM connector.
   3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTION - SPECIFIED CONDITIONS (CHECK FOR OPEN)
      
      

      Tester Connections	Specified Conditions
      Stop light switch (S7-1) - STP (E5-19)	Below 1

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

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE ECM