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Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Vehicle Stability Control System (For Vacuum Brake Booster) - Diagnostic Codes (B1380-U0074) & Symptom Tests >> VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster) >> DTC C1380-7E: Stop Lamp Relay Actuator Stuck On [08/2019 - ] >> Procedure

DTC C1380-7E: Stop Lamp Relay Actuator Stuck On [08/2019 - ]: Procedure

  1. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) CONNECTOR) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
      GTY877473Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU (Brake actuator assembly))

      OK

      The connector is securely connected.

    2. Disconnect the A58 skid control ECU (brake actuator assembly) connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A58-35 (STP) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V
      A58-26 (STPO) - Body ground Ignition switch ON 11 to 14 V
      A58-5 (STP2) - Body ground Brake pedal released Below 1.5 V

      Result

      Result Proceed to
      All terminal voltage is normal A
      Only STP terminal voltage abnormal B
      Only STP2 terminal voltage abnormal C
      STPO terminal and STP terminal voltage abnormal D

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

    Result: 

    C 

    See step  3

    Result: 

    D 

    See step  7

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LAMP RELAY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Enter the following menus: Chassis / Brake / Active Test.
      CHASSIS > BRAKE > ACTIVE TEST

      Tester Display Measurement Item Control Range Restrict Condition Diagnostic Note
      Stop Lamp Relay Stop light control relay (stop light switch assembly) (STPO terminal output) OFF / ON Vehicle condition: Vehicle stopped
      HINT: 
      To protect this Actuator and Solenoid, this test will only last 10 seconds.      		 Check that the stop light control relay (stop light switch assembly) (STPO terminal output) turns ON when the brake pedal is released, the stop lights blink, and the "stop light relay" and "STPO" Data List items switch to ON.
    4. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [08/2019 - ]

      Result

      Result Proceed to
      DTC C1380-7E is not output. A
      DTC C1380-7E is output. B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

    Result: 

    B 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

  3. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Disconnect the A58 skid control ECU (brake actuator assembly) connector.
      GTY877472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU (Brake actuator assembly))
    2. Disconnect the O12 rear combination light assembly LH connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A58-35 (STP) - Body ground Brake pedal released Below 1.5 V

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE REAR LH COMBINATION LIGHT ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Disconnect the A58 skid control ECU (brake actuator assembly) connector.
      GTY877472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU (Brake actuator assembly))
    2. Disconnect the O12 rear combination light assembly LH connector.
    3. Disconnect the O13 rear combination light assembly RH connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A58-35 (STP) - Body ground Brake pedal released Below 1.5 V

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE REAR RH COMBINATION LIGHT ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR LIGHT ASSEMBLY LH) 
    1. Disconnect the A58 skid control ECU (brake actuator assembly) connector.
      GTY877472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU (Brake actuator assembly))
    2. Disconnect the O12 rear combination light assembly LH connector.
    3. Disconnect the O13 rear combination light assembly RH connector.
    4. Disconnect the X1 center stop light assembly connector.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A58-35 (STP) - Body ground Brake pedal released Below 1.5 V

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTER STOP LIGHT ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT CONTROL ECU ASSEMBLY) 
    1. Disconnect the A58 skid control ECU (brake actuator assembly) connector.
      GTY877472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid control ECU (Brake actuator assembly))
    2. Disconnect the O12 rear combination light assembly LH connector.
    3. Disconnect the O13 rear combination light assembly RH connector.
    4. Disconnect the X1 center stop light assembly connector.
    5. Disconnect the A69 stop light control ECU assembly connector.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A58-35 (STP) - Body ground Brake pedal released Below 1.5 V

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    2. Disconnect the A58 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the A69 stop light switch assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A58-26 (STPO) or A69-4 (ACC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT) 

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