VEHICLE STABILITY CONTROL SYSTEM(for Hydraulic Brake Booster), Diagnostic DTC:C1380

DTC Code DTC Name
C1380 Stop Light Control Relay Malfunction

DESCRIPTION

When the skid control ECU (master cylinder solenoid) applies the brakes after receiving a brake request signal from the pre-collision system, dynamic radar cruise control system, secondary collision brake system or brake hold control system, the skid control ECU (master cylinder solenoid) operates the stop light control relay (stop light switch assembly) to illuminate the stop lights.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1380 Stop Light Control Relay Malfunction

Either condition is met:


  • When the voltage at the +BS terminal is between 10 V or more and the stop light control relay (stop light switch assembly) drive output (STPO) is on, a signal is not input to the STP terminal for 5 seconds or more.

  • When the voltage at the +BS terminal is between 10 V or more and the stop light control relay (stop light switch assembly) drive output (STPO) is off, the signal at the STP2 terminal is different from the input signal at the STP terminal for 5 seconds or more.

  • Wire harness or connector

  • Stop light switch assembly

  • Skid control ECU (Master cylinder solenoid)

  • Rear combination light assembly LH

  • Rear combination light assembly RH

  • Center stop light assembly

  • Shift lock control ECU (Shift lock control unit assembly)

  • Certification ECU (Smart key ECU assembly)

  • ECM

  • Transmission control ECU assembly (for 1KD-FTV)

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B001HS2E01
B001HJBE01

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (master cylinder solenoid), perform system variant learning and acceleration sensor zero point calibration Click here.

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (STP2, STPO AND STP TERMINAL)


    1. B001CTYC02
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Turn the engine switch off.

    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    3. Disconnect the A7 skid control ECU (master cylinder solenoid) 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
      A7-7 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-7 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      A7-16 (STPO) - Body ground Always 11 to 14 V
      A7-45 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-45 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

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

    B

    CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - SMART KEY ECU ASSEMBLY) Click here

    C

    CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT SWITCH ASSEMBLY) Click here

    D

    CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - REAR COMBINATION LIGHT ASSEMBLY LH) Click here

    E

    CHECK STOP LIGHT SWITCH ASSEMBLY POWER SOURCE CIRCUIT Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (STOP LIGHT RELAY)


    1. Reconnect the A7 skid control ECU (master cylinder solenoid) connector.

    2. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light control relay (Stop light switch assembly) Relay OFF/ON Stop lights come on
      OK
      Stop light turns ON/OFF in response to the GTS operation
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT MASTER CYLINDER SOLENOID Click here

    OK

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light control relay (Stop light switch assembly) Relay OFF/ON Stop lights come on

    3. According to the display on the GTS, perform the Active Test.

    4. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      C1380 is output A
      C1380 is not output B

    A

    REPLACE MASTER CYLINDER SOLENOID (for LHD: Click here
    REPLACE MASTER CYLINDER SOLENOID (for RHD: Click here

    B

    USE SIMULATION METHOD TO CHECK Click here

  4. INSPECT MASTER CYLINDER SOLENOID


    1. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light control relay (Stop light switch assembly) Relay OFF/ON Stop lights come on
    2. B001CUQC84
      *a

      Component with harness connected

      (Stop Light Switch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A99-4 (ACC) - Body ground Active Test is on Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    NG

    REPLACE MASTER CYLINDER SOLENOID (for LHD: Click here
    REPLACE MASTER CYLINDER SOLENOID (for RHD: Click here

  5. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - SMART KEY ECU ASSEMBLY)


    1. B001CTYC03
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the G213 certification ECU (smart key ECU 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
      A7-45 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-45 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

      Result
      Result Proceed to
      OK A
      NG B

    A

    REPLACE SMART KEY ECU ASSEMBLY

    B

  6. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - ECM)


    1. B001CTYC03
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the G56*1, G57*2 or G185*4 ECM connector.


      • *1: for 1GR-FE

      • *2: for 1KD-FTV

      • *4: for 1GD-FTV

    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
      A7-45 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-45 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM (for 1GR-FE: Click here
    REPLACE ECM (for 1KD-FTV: Click here
    REPLACE ECM (for 2TR-FE: Click here
    REPLACE ECM (for 1GD-FTV: Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - SHIFT LOCK CONTROL UNIT ASSEMBLY)


    1. B001CTYC03
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the G150*1 or G45*2 shift lock control ECU (shift lock control unit assembly) connector.


      • *1: w/o Entry and Start System

      • *2: w/ Entry and Start System

    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
      A7-45 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-45 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

      Result
      Proceed to
      OK
      NG (for 1KD-FTV (for Automatic Transmission))
      NG (except 1KD-FTV (for Automatic Transmission))

    OK

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY (for A750F: Click here
    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY (for AC60F: Click here

    NG (except 1KD-FTV (for Automatic Transmission))

    GO TO STEP 9 Click here

    NG (for 1KD-FTV (for Automatic Transmission))

  8. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - TCM)


    1. B001CTYC03
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the G70 TCM 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
      A7-45 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-45 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TMC Click here

    NG

  9. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT SWITCH ASSEMBLY)


    1. B001CTYC03
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the A99 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
      A7-45 (STP2) - Body ground Always Below 1.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT SWITCH ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-45 (STP2) - A99-3 (L) Always Below 1 Ω
      A7-45 (STP2) or A99-3 (L) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT SWITCH ASSEMBLY)


    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the A99 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
      A7-16 (STPO) - A99-4 (ACC) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - REAR COMBINATION LIGHT ASSEMBLY LH)


    1. B001CTYC01
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the R22 rear combination light assembly LH 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
      A7-7 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-7 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    NG

  13. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - REAR COMBINATION LIGHT ASSEMBLY RH)


    1. B001CTYC01
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the Q31*1 or R21*2 rear combination light assembly RH connector.


      • *1: for 3 Door

      • *2: for 5 Door

    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
      A7-7 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-7 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH Click here

    NG

  14. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - CENTER STOP LIGHT ASSEMBLY)


    1. B001CTYC01
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the Z1 center stop light 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
      A7-7 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) 11 to 14 V*
      A7-7 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V

      Tech Tips

      *: The minimum voltage value varies depending on the +BS terminal voltage value. The minimum voltage is 85% or more of the +BS terminal voltage.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP LIGHT ASSEMBLY Click here

    NG

  15. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT SWITCH ASSEMBLY)


    1. B001CTYC01
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the A99 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
      A7-7 (STP) - Body ground Always Below 1.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT SWITCH ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A99-1 (OUT) - A7-7 (STP) Always Below 1 Ω
      A99-1 (OUT) or A7-7 (STP) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. CHECK STOP LIGHT SWITCH ASSEMBLY POWER SOURCE CIRCUIT


    1. B001HWBC15
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK
      The connector is securely connected.

    2. Disconnect the A99 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
      A99-2 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A99-7 (B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT SWITCH ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-16 (STPO) or A99-4 (ACC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR