VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380

DTC Code DTC Name
C1380 Stop Light Control Relay Malfunction

DESCRIPTION

Upon receiving the brake hold control operating signal from the skid control ECU (brake actuator assembly), the relay contact turns on and the stop lights come on.

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

  • When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is ON, EXO is OFF and STP2 is OFF for 5 seconds or more.

  • When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is OFF, EXO is OFF and input signals for STP and STP2 differ for 5 seconds or more.

  • Wire harness or connector

  • Skid control ECU (Brake actuator assembly)

  • STOP fuse

  • P/I-B NO.1 fuse

  • Stop light switch assembly

  • ECM

  • Shift lock control unit assembly

  • Certification ECU (Smart key ECU assembly)

  • Rear light assembly RH

  • Rear light assembly LH

  • Center stop light assembly

  • Rear combination light assembly RH

  • Rear combination light assembly LH

  • No. 2 integration relay

 -
C1380 DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is ON, EXO is OFF and STP2 is OFF ○ -
When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is OFF, EXO is OFF and input signals for STP and STP2 differ - ○
Detection Time 5 seconds or more. 5 seconds or more.
Number of Trips 1 trip 1 trip

Tech Tips

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

WIRING DIAGRAM

B002E1IE01

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

    Click here

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

  • Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

Tech Tips

When C1425 is output together with C1380, inspect and repair the trouble areas indicated by C1425 first.

PROCEDURE


  1. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) CONNECTOR)


    1. B002CETC86
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 A52 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
      A52-35 (STP) - Body ground Brake pedal depressed 8 to 14 V
      Brake pedal released Below 1.5 V
      A52-26 (STPO) - Body ground Engine switch on (IG) 11 to 14 V
      A52-5 (STP2) - Body ground Brake pedal depressed 8 to 14 V
      Brake pedal released Below 1.5 V
      Result
      Result Proceed to
      All terminal voltage is normal A
      Only STP terminal voltage abnormal B
      Only STPO terminal voltage abnormal C
      Only STP2 terminal voltage abnormal D
      STPO terminal and STP2 terminal voltage abnormal E

    B

    CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - TCM) Click here

    C

    CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 INTEGRATION RELAY) Click here

    D

    CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NO. 2 INTEGRATION RELAY) Click here

    E

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY POWER SOURCE TERMINAL) Click here

    A

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


    1. Reconnect the A52 skid control ECU (brake actuator assembly) connector.

    2. Perform "Active Test" according to the display on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay No. 2 integration relay Relay ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay

    3. According to the display on the GTS, perform the Active Test and check the operation of the stop lights.

      OK
      Stop lights turn on/off in accordance with the Active Test.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT BRAKE ACTUATOR ASSEMBLY Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Perform "Active Test" according to the display on the GTS.


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay No. 2 integration relay Relay ON/OFF Stop lights come on Vehicle condition: Vehicle stopped

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay

    3. Check if the same DTC is recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1380 is not output. A
      DTC C1380 is output. (for LHD) B
      DTC C1380 is output. (for RHD) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. INSPECT BRAKE ACTUATOR ASSEMBLY


    1. Perform "Active Test" according to the display on the GTS.


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay No. 2 integration relay Relay ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
    2. B002CX5C02
      *a Component with harness connected (No. 2 integration relay)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2A-7 (ACC) - Body ground Active Test is ON Below 1.5 V
      Result
      Proceed to
      OK
      NG (for LHD)
      NG (for RHD)

    OK

    REPLACE NO. 2 INTEGRATION RELAY Click here

    NG (for LHD)

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG (for RHD)

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - TCM)


    1. B002CETC88
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 A28 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
      A52-35 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A52-35 (STP) - Body ground Brake pedal released Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TCM Click here

    NG

  6. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SHIFT LOCK CONTROL UNIT ASSEMBLY)


    1. B002CETC88
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 K40 transmission floor shift 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
      A52-35 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A52-35 (STP) - Body ground Brake pedal released Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSMISSION FLOOR SHIFT ASSEMBLY Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SMART KEY ECU ASSEMBLY)


    1. B002CETC88
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 A21 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
      A52-35 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A52-35 (STP) - Body ground Brake pedal released Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SMART KEY ECU ASSEMBLY

    NG

    CHECK WIRE HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 INTEGRATION RELAY) Click here

  8. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 INTEGRATION RELAY)


    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 2A No. 2 integration relay 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
      A52-26 (STPO) - 2A-7 (ACC) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 INTEGRATION RELAY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. CHECK WIRE HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 INTEGRATION RELAY)


    1. B002CETC88
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 2A No. 2 integration relay 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
      A52-35 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A52-35 (STP) - Body ground Brake pedal released Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 INTEGRATION RELAY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NO. 2 INTEGRATION RELAY)


    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 A3 stop light switch assembly connector.

    3. Disconnect the 2A No. 2 integration relay connector.

    4. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-2 (L) -2A-11 (STP0) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR LIGHT ASSEMBLY RH)


    1. B002CETC89
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 X10 rear light assembly RH 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
      A52-5 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A52-5 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY RH Click here

    NG

  12. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR LIGHT ASSEMBLY LH)


    1. B002CETC89
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 X1 rear 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
      A52-5 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A52-5 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY LH Click here

    NG

  13. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - CENTER STOP LIGHT ASSEMBLY)


    1. B002CETC89
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 U23 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
      A52-5 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A52-5 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP LIGHT ASSEMBLY Click here

    NG

  14. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH)


    1. B002CETC89
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 U35 rear combination light assembly RH 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
      A52-5 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A52-5 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH Click here

    NG

    CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH) Click here

  15. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY POWER SOURCE TERMINAL)


    1. B002CPGC02
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)

      Turn the engine switch off.

    2. Disconnect the 2A and 2B No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2B-7 (BATT) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-22 (GNDA) - Body ground Always Below 1 Ω
      2B-10 (GNDB) - Body ground Always Below 1 Ω
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 INTEGRATION RELAY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A52-26 (STPO) or 2A-7 (ACC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 INTEGRATION RELAY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH)


    1. B002CETC89
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 U36 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
      A52-5 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) 8 to 14 V
      A52-5 (STP2) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    NG

  18. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 INTEGRATION RELAY)


    1. B002CETC89
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator 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 2A No. 2 integration relay connectors.

    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 Voltage
      Tester Connection Condition Specified Condition
      A52-5 (STP2) - Body ground Always Below 1.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY POWER SOURCE TERMINAL)


    1. B002CPGC02
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)

      Turn the engine switch off.

    2. Disconnect the 2A and 2B No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2B-7 (BATT) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-22 (GNDA) - Body ground Always Below 1 Ω
      2B-10 (GNDB) - Body ground Always Below 1 Ω
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  20. CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-3 (STOP) - A52-5 (STP2) Always Below 1 Ω
      2A-3 (STOP) or A52-5 (STP2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 INTEGRATION RELAY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR