Inspection Procedure

HINT:

When DTC C1249/49 is output together with DTC C1380/64, inspect and repair the trouble areas indicated by DTC C1249/49 first (See DTC C1249/49 OPEN IN STOP LIGHT SWITCH CIRCUIT  ).

1. CHECK STOP LIGHT OPERATION 
   1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

      OK 

      ILLUMINATION CONDITION CHART
      
      

      Condition	Illumination Condition
      Brake pedal depressed	ON
      Brake pedal released	OFF

      NG: INSPECT STOP LIGHT CIRCUIT  (See PROBLEM SYMPTOMS TABLE )

      OK: Go to next step 

2. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON.
   3. Select the Data List on the Techstream (See DATA LIST / ACTIVE TEST  ).

      ABS/VSC/TRAC 

      ABS/VSC/TRAC DATA LIST
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Stop Light SW	Stop light switch / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   4. Check that the stop light switch condition observed on the Techstream changes according to brake pedal operation.

      OK: 

      The Techstream displays ON or OFF according to brake pedal operation  .

      NG: Go to step  9

      OK: Go to next step 

3. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT CONTROL (BRK) RELAY) 
   1. Select the Data List on the Techstream (See DATA LIST / ACTIVE TEST  ).

      ABS/VSC/TRAC 

      ABS/VSC/TRAC DATA LIST
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Stop Light Relay	Stop light control (BRK) relay / ON or OFF	ON: Relay on OFF: Relay off	-
      Stop Light Relay Output	Stop light control (BRK) relay output / ON or OFF	ON: Relay output on OFF: Relay output off	-

   2. Select the Active Test on the Techstream (See DATA LIST / ACTIVE TEST  ).

      ABS/VSC/TRAC 

      ABS/VSC/TRAC ACTIVE TEST REFERENCE
      
      

      Tester Display	Test Part	Control Range	Diagnostic Note
      Stop Light Relay	Stop light control (BRK) relay	Relay ON/OFF	Stop lights come on

   3. Perform the Active Test of the stop light control (BRK) relay using the Techstream.
   4. Check for stop light control (BRK) relay operation using Data List and stop light operation by performing an Active Test.

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      Data List content and stop light operation are normal	A
      Data List content is normal but stop lights do not turn on or off	B

      B: Go to step  6

      A: Go to next step 

4. INSPECT SKID CONTROL ECU (STP2 TERMINAL) 
   1. Turn the ignition switch off.
   2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
   3. Disconnect the skid control ECU connector.
   4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Switch Condition	Specified Condition
      A42-13 (STP2) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
      A42-13 (STP2) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

      Text in Illustration 

      ILLUSTRATION LEGEND
      
      

      *1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU)

      Fig 1: Identifying STP2 Terminal Of Skid Control ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT) 

      OK: Go to next step 

5. RECONFIRM DTC 
   1. Reconnect the skid control ECU connector.
   2. Clear the DTCs (See DTC CHECK / CLEAR  ).
   3. Start the engine.
   4. Perform a road test.
   5. Check if the same DTC is recorded (See DTC CHECK / CLEAR  ).

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      DTC (C1380/64) is not output	A
      DTC (C1380/64) is output	B

      B: REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL  )

      A: CHECK FOR INTERMITTENT PROBLEMS  (See HOW TO PROCEED WITH TROUBLESHOOTING )

6. INSPECT STOP LIGHT CONTROL (BRK) RELAY 
   1. Turn the ignition switch off.
   2. Remove the stop light control (BRK) relay.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      3 - 4	Voltage is not applied between terminals 1 and 2	Below 1 Ω
      3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
      3 - 4	Voltage is applied between terminals 1 and 2	10 kΩ or higher
      3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω

      Text in Illustration 

      ILLUSTRATION LEGEND
      
      

      *1	Stop Light Control (BRK) Relay

      Fig 2: Inspecting Stop Light Control (BRK) Relay

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE STOP LIGHT CONTROL (BRK) RELAY 

      OK: Go to next step 

7. INSPECT ENGINE ROOM RELAY BLOCK (POWER SOURCE TERMINAL) 
   1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      Stop light control (BRK) relay terminal 5 - Body ground	Always	11 to 14 V
      Stop light control (BRK) relay terminal 2 - Body ground	Ignition switch ON	11 to 14 V

      Text in Illustration 

      ILLUSTRATION LEGEND
      
      

      *1	Engine Room Relay Block
      *2	Stop Light Control (BRK) Relay

      Fig 3: Identifying Stop Light Control (BRK) Relay

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      OK: Go to next step 

8. INSPECT SKID CONTROL ECU (STP0 TERMINAL) 
   1. Install the stop light control (BRK) relay.
   2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
   3. Disconnect the skid control ECU connector.
   4. Turn the ignition switch to ON.
   5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Switch Condition	Specified Condition
      A42-39 (STP0) - Body ground	Ignition switch ON	11 to 14 V

      Text in Illustration 

      ILLUSTRATION LEGEND
      
      

      *1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU)

      Fig 4: Identifying STP0 Terminal Of Skid Control ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT) 

      OK: REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL  )

9. INSPECT SKID CONTROL ECU (STP TERMINAL) 
   1. Turn the ignition switch off.
   2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
   3. Disconnect the skid control ECU connector.
   4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Switch Condition	Specified Condition
      A42-30 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
      A42-30 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

      Text in Illustration 

      ILLUSTRATION LEGEND
      
      

      *1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU)

      Fig 5: Identifying STP Terminal Of Skid Control ECU Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      OK: REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL  )