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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (Electronically Controlled Brake System (HV) - Diagnostic Codes (08 Of 11)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C1380-7F: Stop Lamp Relay Actuator Stuck Off [11/2023 - ] >> Procedure

DTC C1380-7F: Stop Lamp Relay Actuator Stuck Off [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM ACTIVE TEST USING GTS (STOP LAMP RELAY) 
    1. Perform the stop light control relay (stop light switch assembly) Active Test, and confirm that the stop lights illuminate and turn off and the value of "Stop Light SW", "Stop Light Relay" and "STPO" changes.

      Chassis > Brake/EPB > Active Test 

      Tester Display Measurement Item Control Range Restrict Condition Diagnostic Note
      Stop Lamp Relay Stop light control relay (Stop light switch assembly) OFF / ON Vehicle condition: Vehicle stopped
      HINT: 
      To protect this Actuator and Solenoid, this test will only last 5 seconds.      		 With the brake pedal released, check that the stop lights illuminate and the value of Stop Light Relay on the GTS changes to ON when Stop Lamp Relay is ON

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch assembly status
      (STP or STP2 terminal input)      		 OFF / ON OFF: Brake pedal released
      ON: Brake pedal depressed      		 HINT: 
      • Stop light control relay off: STP terminal status displayed.
      • Stop light control relay on: STP2 terminal status displayed.
      Stop Light Relay Stop light control relay (Stop light switch assembly) status
      (STP terminal input)      		 OFF / ON OFF: Stop light control relay (Stop light switch assembly) off and brake pedal released
      ON: Stop light control relay (Stop light switch assembly) on or brake pedal depressed      		 HINT: 
      The voltage of power supplied to the stop lights is measured at the STP terminal.
      STPO Stop light control relay (Stop light switch assembly) status
      (STPO terminal output)      		 OFF / ON OFF: Stop light control relay (Stop light switch assembly) off (Stop light off)
      ON: Stop light control relay (Stop light switch assembly) on (Stop light on)      		 HINT: 
      When STPO is ON, the stop light control relay (stop light switch assembly) turns ON and the stop lights illuminate

      Chassis > Brake/EPB > Active Test 

      Active Test Display
      Stop Lamp Relay
      Data List Display
      Stop Light SW
      Stop Light Relay
      STPO

      Result

      Data List Status Stop Light Illumination Status Proceed to
      Stop Light SW Stop Light Relay STPO
      OFF OFF ON Not illuminated A
      OFF OFF ON Illuminated B
      ON ON ON Illuminated C

    Result: 

    B 

    See step  7

    Result: 

    C 

    See step  8

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Turn the ignition switch off.
      GTY848523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Skid Control ECU (Brake Actuator Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the A57 No. 2 skid control ECU (brake actuator assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A57-32 (STPO) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  3

  3. CHECK BRAKE ACTUATOR ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A57-11 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V
      GTY928475Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Skid Control ECU (Brake Actuator Assembly))

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK FOR SHORT TO GROUND IN STP CIRCUIT 
    1. Check that there is no short to ground in the STP circuit (wire harnesses, connectors, stop lights and ECUs)

      OK

      There is no short to ground.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PART 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    2. Disconnect the A42 stop light switch assembly connector.
    3. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A42-1 (OUT) - A57-11 (STP) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK STOP LIGHT SWITCH ASSEMBLY 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY909006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Stop Light Switch Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A42-4 (ACC) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

  7. CHECK BRAKE ACTUATOR ASSEMBLY 
    1. Turn the ignition switch off.
      GTY928475Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Skid Control ECU (Brake Actuator Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the A57 No. 2 skid control ECU (brake actuator assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A57-11 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK BRAKE ACTUATOR ASSEMBLY 
    1. Turn the ignition switch off.
      GTY848527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Skid Control ECU (Brake Actuator Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

    3. Disconnect the A57 No. 2 skid control ECU (brake actuator assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A57-37 (STP2) - Body ground Stop light switch assembly off
      (Brake pedal released)      		 Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    See step  9

  9. CHECK STOP LIGHT SWITCH ASSEMBLY 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

      OK

      The connector is securely connected.

      GTY848527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Skid Control ECU (Brake Actuator Assembly))
    2. Disconnect the A42 stop light switch 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
      A57-37 (STP2) - Body ground Always Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    See step  10

  10. CHECK FOR SHORT TO +B IN STP2 CIRCUIT 
    1. Check that there is no short to +B in the STP2 circuit (wire harnesses, connectors and ECUs).

      OK

      No short to +B.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PART 

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