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Home >> Toyota >> 2011 >> Highlander Hybrid >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System (Diagnostic Codes & Symptom Tests) (Hybrid) >> Electronically Controlled Brake System >> DTC C1380/64: Stop Light Control Relay Malfunction >> Procedure

DTC C1380/64: Stop Light Control Relay Malfunction: Procedure

  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

      Condition Illumination Condition
      Brake pedal depressed ON
      Brake pedal released OFF

    NG → See step   13 

    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, refer to DATA LIST / ACTIVE TEST .
      ABS/VSC/TRAC

      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 and OFF according to brake pedal operation.

    NG → See step   10 

    OK: Go to next step 

  3. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT CONTROL RELAY) 
    1. Select the Active Test on the Techstream, refer to DATA LIST / ACTIVE TEST .
      ABS/VSC/TRAC

      Tester Display Test Part Control Range Diagnostic Note
      Stop Light Relay Stop light control relay Relay ON/OFF Stop lights come on
    2. Perform the Active Test of the stop light control relay using the Techstream.
    3. Select the Data List on the Techstream, refer to DATA LIST / ACTIVE TEST .
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light Relay Stop light control relay / ON or OFF ON: Relay on
      OFF: Relay off      		 -
      Stop Light Relay Output Stop light control relay output / ON or OFF ON: Relay output on
      OFF: Relay output off      		 -
    4. Check for stop light control relay operation using the Data List and stop light operation while performing an Active Test.

      Result

      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 → See step   6 

    A: Go to next step 

  4. INSPECT SKID CONTROL ECU (STP2 TERMINAL) 
    1. Turn the ignition switch off.
      Fig 1: Identifying Skid Control ECU Connector Terminals
      GTY301299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    3. Disconnect the A44 skid control ECU connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A44-14 (STP2) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      A44-14 (STP2) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
      TEXT IN ILLUSTRATION

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

    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, refer to DTC CHECK / CLEAR .
    3. Turn the ignition switch to ON (READY).
    4. Perform a road test.
    5. Check if the same DTC is recorded, refer to DTC CHECK / CLEAR .

      Result

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

    B → See step   12 

    A → See step   11 

  6. INSPECT ECU IG NO. 2 FUSE 
    1. Remove the ECU IG NO. 2 fuse from the main body ECU (instrument panel junction block).
      Fig 2: Identifying ECU IG No. 2 Fuse
      GTY294491Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      ECU IG NO. 2 (7.5 A) fuse Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Instrument Panel Junction Block
      *2 ECU IG NO. 2 Fuse

    NG → REPLACE FUSE 

    OK: Go to next step 

  7. INSPECT STOP LIGHT CONTROL RELAY (STOP) 
    1. Turn the ignition switch off.
      Fig 3: Identifying Stop Light Control Relay
      GTY300553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the stop light control relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      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

      *1 Stop Light Control Relay (STOP LP Relay)

    NG → REPLACE STOP LIGHT CONTROL RELAY (STOP) 

    OK: Go to next step 

  8. INSPECT ENGINE ROOM RELAY BLOCK (POWER SOURCE TERMINAL) 
    Fig 4: Identifying Engine Room Relay Block Power Source Terminal
    GTY298343Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Stop light control relay terminal 5 - Body ground Always 11 to 14 V
      Stop light control relay terminal 2 - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. INSPECT SKID CONTROL ECU (STP0) 
    1. Install the stop light control relay.
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
      Fig 5: Identifying Skid Control ECU Connector Terminal
      GTY301956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the A45 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

      Tester Connection Switch Condition Specified Condition
      A45-11 (STP0) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   12 

  10. INSPECT SKID CONTROL ECU (STP TERMINAL) 
    1. Turn the ignition switch off.
      Fig 6: Identifying Skid Control ECU Connector Terminal
      GTY300925Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    3. Disconnect the A47 skid control ECU connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A47-16 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      A47-16 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
      TEXT IN ILLUSTRATION

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT) 

    OK → See step   12 

  11. CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  12. REPLACE SKID CONTROL ECU. Refer to  REMOVAL 
  13. GO TO LIGHTING SYSTEM (PROBLEM SYMPTOMS TABLE). Refer to  PROBLEM SYMPTOMS TABLE 
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