Inspection Procedure

1. Check the DATA LIST for proper functioning of the stop light switch.
   1. Intelligent tester

      CCS 

      INTELLIGENT TESTER - CCS
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      STP LIGHT SW M	Stop light switch signal (Main CPU) / ON or OFF	OK: Brake pedal is depressed OFF: Brake pedal is released	-

   2. Techstream

      Cruise Control 

      TECHSTREAM - CRUISE CONTROL
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Stop Light SW M-CPU	Stop light switch signal (Main CPU) / ON or OFF	OK: Brake pedal is depressed OFF: Brake pedal is released	-

      OK: Display changes according to brake pedal operation described in the above tables. 

NG: Go to step 2 

OK: REPLACE ECM  (See REMOVAL )

1. Remove the STOP fuse from the main body ECU.
2. Remove the ECU-IG fuse from the engine room No. 2 junction block.
3. Measure the resistance of the fuses.

   Standard resistance 

   FUSE (STOP, ECU-IG)
   
   

   Tester Connection	Condition	Switch Condition
   STOP fuse	Always	Below 1 Ω
   ECU-IG fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: GO TO NEXT STEP 

1. Remove the stop light switch (see REMOVAL ).
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   STOP LIGHT SWITCH ASSEMBLY
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 -2	Pushed	Below 1 Ω
   1 -2	Not pushed	10 kΩ or higher
   3-4	Not pushed	Below 1 Ω
   3-4	Pushed	10 kΩ or higher

   Fig 1: Inspecting Stop Light Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY  (See REMOVAL )

OK: GO TO NEXT STEP 

1. Disconnect the A14 ECM connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   ECM - BATTERY
   
   

   Tester Connection	Switch Condition	Specified Condition
   A14-12 (STP) - Body ground	Brake pedal is depressed	11 to 14 V
   A14-12 (STP) - Body ground	Brake pedal is released	Below 1 V
   A14-13 (ST1-) - Body ground	Brake pedal is released	11 to 14 V
   A14-13 (ST1-) - Body ground	Brake pedal is depressed	Below 1 V

   Fig 2: Identifying A14 ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM  (See REMOVAL )