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 

   PEDAL CONDITION CHART
   
   

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

NG:  Go to step  4

OK: Go to next step 

1. Disconnect the skid control ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   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

NG:  Go to step  6

Fig 1: Identifying Skid Control ECU Connector Terminals (STP Terminal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.

   HINT:

   Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B : REPLACE BRAKE ACTUATOR ASSEMBLY 

A : END 

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

   Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Fig 2: Identifying Stop Light Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

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

   Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

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

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

Fig 3: Inspecting Stop Light Switch Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 the table below.

   Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU) 

Fig 4: Identifying Stop Light Switch Connector And Skid Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT)