Inspection Procedure

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

OK: Stop lamps turn ON when brake pedal is depressed. 

1. NG: REPAIR OR REPLACE STOP LAMP SWITCH CIRCUIT 
2. OK: Go to next step. 

1. Connect a hand-held tester or OBD II scan tool to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester or scan tool ON.
4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STOP LIGHT SW.
5. Read the value displayed on the tester.
6. If using an OBD II scan tool, refer to the instruction manual .

   Standard: 

   STP SIGNAL AND ST1- VOLTAGE
   
   

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

   Fig 1: Identifying Brake Pedal Operations

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
2. NG: Go to next step 

1. Check the resistance when the stop lamp switch is ON and OFF.

   Standard: 

   STOP LAMP SWITCH ASSY
   
   

   Switch Positions	Tester Connections	Specified Conditions
   ON (Free)	1 - 2	Below 1 Ω
   OFF (Pushed in)	1 - 2	10 kΩ or higher

   Fig 2: Inspecting Stop Lamp Switch Assy

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPLACE STOP LAMP SWITCH ASSY 
2. OK: Go to next step. 

1. Disconnect the S8 stop lamp switch connector.
2. Disconnect the E4 ECM connector.
3. Check the resistance.

   Standard (Check for open): 

   STOP LAMP SWITCH - ECM (CHECK FOR OPEN)
   
   

   Tester Connections	Specified Conditions
   Stop lamp switch (S8-1) - STP (E4-19)	Below 1 Ω

   Standard (Check for short): 

   STOP LAMP SWITCH - ECM (CHECK FOR SHORT)
   
   

   Tester Connections	Specified Conditions
   Stop lamp switch (S8-1) or STP (E4-19) - Body ground	10 kΩ or higher

   Fig 3: Checking Harness And Connector (Stop Lamp Switch - ECM) (1 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 4: Checking Harness And Connector (Stop Lamp Switch - ECM) (2 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the stop lamp switch connector.
5. Reconnect the ECM connector.

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: REPLACE ECM (See  REPLACEMENT  )