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 

HINT:

Check the stop light bulb as it may have burnt out.

OK: Go to next step 

1. Disconnect the skid control ECU connector.
2. Measure the voltage according to the value(s) in TERMINALS VOLTAGE SPECIFICATION TABLE .

   Standard: 

   TERMINALS VOLTAGE SPECIFICATION TABLE
   
   

   Tester Connection	Condition	Specified Condition
   S28-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
   S28-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

   Fig 1: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result: 

   RESULT REFERENCE
   
   

   OK (When troubleshooting in accordance with the DTC TABLE.)	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 (SEE  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: 

B: END 

A: REPLACE MASTER CYLINDER SOLENOID (See  OVERHAUL  ) 

1. Disconnect the stop light switch connector.
2. Measure the voltage according to the value(s) in TERMINALS VOLTAGE SPECIFICATION TABLE .

   Standard: 

   TERMINALS VOLTAGE SPECIFICATION TABLE
   
   

   Tester Connection	Condition	Specified Condition
   S12-2 - Body ground	Always	10 to 14 V

   Fig 2: Identifying Stop Light Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to next step 

1. Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

   Standard: 

   TERMINALS RESISTANCE SPECIFICATION TABLE
   
   

   Tester Connection	Condition	Specified Condition
   S12-1 - S12-2	Switch pin free	Below 1
   S12-1 - S12-2	Switch pin pushed in	10 k or higher

   Fig 3: Identifying Stop Lamp Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH ASSY 

OK: Go to next step 

1. Remove the stop light operation relay.
2. Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

   Standard: 

   TERMINALS RESISTANCE SPECIFICATION TABLE
   
   

   Tester Connection	Specified Condition
   3 - 4	Below 1

   Fig 4: Inspecting Stop Light Operation Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT OPERATION RELAY 

OK: Go to next step 

1. Disconnect the skid control ECU connector.
2. Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

   Standard: 

   TERMINALS RESISTANCE SPECIFICATION TABLE
   
   

   Tester Connection	Specified Condition
   S28-7 (STP) - S12-1	Below 1
   S28-7 (STP) - Body ground	10 k or higher

   Fig 5: Identifying Skid Control ECU Connector & Stop Light Switch Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE MASTER CYLINDER SOLENOID (See  OVERHAUL  ) 

HINT:

• When troubleshooting in accordance with the DTC TABLE, 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  ).