Inspection Procedure

1. Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.

   OK: 

   STOP LIGHT SWITCH OPERATION (STOP LIGHT SWITCH CIRCUIT)
   
   

   Pedal Condition	Illumination Condition
   Brake pedal depressed	ON
   Brake pedal released	OFF

1. NG: Go to step   4 
2. OK: Go to next step. 

1. Disconnect the skid control ECU connector.
2. Measure the voltage according to the value(s) in SKID CONTROL ECU CONNECTOR (STP TERMINAL)  .

   Standard: 

   SKID CONTROL ECU CONNECTOR (STP TERMINAL)
   
   

   Tester Connection	Switch Condition	Specified Condition
   A40-20 (STP) - Body ground	Brake pedal depressed	8 to 14 V
   A40-20 (STP) - Body ground	Brake pedal released	Below 4.0 V

   Fig 1: Inspecting Skid Control ECU Connector (STP Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Go to step   6 
2. OK: Go to next step. 

1. Clear the DTC.
2. Start the engine.
3. Depress the brake pedal several times to test the stop light circuit.
4. Check that the same DTC is recorded.

   Result: 

   RECONFIRM DTC
   
   

   DTC is not output	A
   DTC is output	B

1. B: REPLACE BRAKE ACTUATOR ASSY (SEE  REPLACEMENT  ) 
2. A: END 

HINT:

It is suspected that the DTCs were output due to a bad connection of the connector terminal.

1. Disconnect the stop light switch connector.
2. Measure the voltage according to the value(s) in STOP LIGHT SWITCH ASSY (POWER SOURCE TERMINAL VOLTAGE)  .

   Standard: 

   STOP LIGHT SWITCH ASSY (POWER SOURCE TERMINAL VOLTAGE)
   
   

   Tester Connection	Condition	Specified Condition
   A23-2 - Body ground	Always	10 to 14 V

   Fig 2: Inspecting Stop Light Switch Assy (Power Source Terminal Voltage)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 
2. OK: Go to next step. 

1. Disconnect the stop light switch assy connector.
2. Measure the resistance according to the value(s) in STOP LIGHT SWITCH ASSY  .

   Standard: 

   STOP LIGHT SWITCH ASSY
   
   

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

   Fig 3: Inspecting Stop Light Switch Assy

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. Disconnect the stop light switch connector and skid control ECU connector.
2. Measure the resistance according to the value(s) in STOP LIGHT SWITCH TO SKID CONTROL ECU  .

   Standard: 

   STOP LIGHT SWITCH TO SKID CONTROL ECU
   
   

   Tester Connection	Specified Condition
   A40-20 (STP) - A23-1 (STP)	Below 1 Ω

   Fig 4: Checking Harness And Connector (Stop Light Switch To Skid Control ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU) 
2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT)