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 function is normal. 

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.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S37-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
   S37-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

   Fig 1: Identifying S37 Skid Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result 

   RESULT CHART
   
   

   Condition	Proceed to
   OK (When troubleshooting in accordance with the DTC CHART)	A
   OK (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE)	B
   NG	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

A: Go to next step 

1. Clear the DTC (See DTC CHECK/CLEAR  ).
2. Check if the same DTC is detected (See DTC CHECK/CLEAR  ).

   HINT:

   Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

   Result 

   RESULT CHART
   
   

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

B: END 

A: REPLACE MASTER CYLINDER SOLENOID 

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

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S17-2 - Body ground	Always	10 to 14 V

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

Fig 2: Identifying S17 Stop Light Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S17-1 - S17-2	Switch pin free	Below 1 Ω
   S17-1 - S17-2	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 skid control ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S37-7 (STP) - S17-1	Below 1 Ω
   S37-7 (STP) - Body ground	10 kΩ or higher

   HINT:

   • When troubleshooting in accordance with the DTC CHART, check DTCs before replacing the master cylinder solenoid (See DTC CHECK/CLEAR  ).
   • When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE, be sure to follow the table before replacing the master cylinder solenoid (See PROBLEM SYMPTOMS TABLE  ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE MASTER CYLINDER SOLENOID