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Home › Toyota › 2008 › 4Runner Limited, 4.7 T, AWD › Repair and Diagnosis › Brakes › Traction Control › Brake Control › Vehicle Stability Control System › DTC C1380/64: Stop Light Control Relay Malfunction › Inspection Procedure

Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION  ).
  1. CHECK STOP LIGHT SWITCH OPERATION 
    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. 

      HINT:

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

    NG:  Go to step  9

    OK: Go To Next Step 

  2. INSPECT SKID CONTROL ECU (STP TERMINAL) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION 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 S28 Skid Control ECU Connector Terminals
      G05556561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go To Next Step 

  3. INSPECT SKID CONTROL ECU (STP2 TERMINAL) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S28-7 (STP) - S28-45 (STP2) Always Below 1 Ω
      Fig 2: Identifying Skid Control ECU Connector (STP2 Terminal)
      G05556562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go To Next Step 

  4. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT OPERATION RELAY) 
    1. Reconnect the skid control ECU connector.
    2. Connect Techstream to the DLC3.
    3. Turn the ignition switch to the ON position and push Techstream main switch ON.
    4. Select "Active Test" mode on Techstream.

      ABS/VSC/TRAC 

      ACTIVE TEST - ABS/VSC/TRAC

      Tester Display Test Part Control Range Diagnostic Note
      Stop Light Relay Turns stop light operation relay ON / OFF Observe rear combination light (Does not come on for 5 sec. or more)
    5. Check that "ON" and "OFF" of the stop light can be shown on the rear combination light by Techstream.

      OK: The stop light turns on or off in accordance with Techstream. 

    OK:  Go to step  8

    NG: Go To Next Step 

  5. INSPECT STOP LIGHT OPERATION RELAY (POWER SOURCE TERMINAL) 
    1. Remove the stop light operation relay.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      1 - Body ground Always 8 to 14 V
      5 - Body ground Always 8 to 14 V
      Fig 3: Identifying Stop Light Operation Relay
      G05556563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go To Next Step 

  6. INSPECT STOP LIGHT OPERATION RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      3 - 4 Always Below 1 Ω
      3 - 5 Always 10 kΩ or higher
      3 - 4 When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2. 10 kΩ or higher
      3 - 5 When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2. Below 1 Ω
      Fig 4: Identifying Stop Light Operation Relay Connectors
      G04965497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE STOP LIGHT OPERATION RELAY 

    OK: Go To Next Step 

  7. INSPECT SKID CONTROL ECU (STPO TERMINAL) 
    1. Install the stop light operation relay.
    2. Disconnect the skid control ECU connector.
    3. Turn the ignition switch to the ON position.
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S28-16 (STPO) - Body ground Always 10 to 14 V
      Fig 5: Identifying S28 Skid Control ECU Connector (STPO Terminal)
      G05556565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go To Next Step 

  8. RECONFIRM DTC (See  INSPECTION PROCEDURE   ) 

    B: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS   ) 

    A: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )

  9. INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL) 
    1. Disconnect the stop light switch connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S12-2 Body ground Always 10 to 14 V
      Fig 6: Identifying Stop Light Switch Connector
      G05556530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go To Next Step 

  10. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester connection Condition Specified condition
      S12-1 - S12-2 Switch pin free Below 1 Ω
      S12-1 - S12-2 Switch pin pushed in 10 kΩ or higher
      Fig 7: Identifying S12 Stop Light Switch Assembly Connector Terminals
      G04965500Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

    OK: Go To Next Step 

  11. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - STOP LIGHT OPERATION RELAY) 
    1. Remove the stop light operation relay.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      S12-1 - 4 Always Below 1 Ω
      S12-1 - Body ground Always 10 kΩ or higher
      Fig 8: Identifying Harness Connector (Stop Light Switch - Stop Light Operation Relay)
      G05556568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  12. INSPECT STOP LIGHT OPERATION RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      3 - 4 Always Below 1 Ω
      Fig 9: Identifying Stop Light Operation Relay Connectors
      G04965497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE STOP LIGHT OPERATION RELAY 

    OK: Go To Next Step 

  13. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - STOP LIGHT OPERATION RELAY) 
    1. Disconnect the rear combination light connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance: 

      for LH 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE LH

      Tester Connection Condition Specified Condition
      R14-1 - 3 Always Below 1 Ω
      R14-1 - Body ground Always 10 kΩ or higher
      R14-6 - Body ground Always Below 1 Ω

      for RH 

      TESTER CONNECTION AND SPECIFIED CONDITION TABLE RH

      Tester Connection Condition Specified Condition
      R15-1 - 3 Always Below 1 Ω
      R15-1 - Body ground Always 10 kΩ or higher
      R15-6 - Body ground Always Below 1 Ω
      Fig 10: Identifying Harness Connector (Rear Combination Light - Stop Light Operation Relay)
      G05556570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )

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