VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380

DTC Code DTC Name
C1380 Stop Light Control Relay Malfunction

DESCRIPTION

When the skid control ECU (brake actuator assembly) 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 (brake actuator assembly) 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 (brake actuator assembly)

  • Rear combination light assembly LH

  • Rear combination light assembly RH

  • Center stop light (center stop light set)

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

  • Certification ECU (smart key ECU assembly)

  • ECM
DTC Detection Conditions: C1380
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition The voltage at the +BS terminal is between 10 V or more. ○ ○
Malfunction Status When the stop light control relay (stop light switch assembly) drive output (STPO) is on, a signal is not input to the STP terminal. ○ -
When 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. - ○
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

B006XA2E02

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), 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.

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

PROCEDURE


  1. READ VALUE USING GTS (BS1 VOLTAGE VALUE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      BS1 Voltage Value +BS voltage value Min.: 0.00 V, Max.: 20.00 V - Changes in proportion to battery voltage

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      BS1 Voltage Value

    4. Take a note of the +BS voltage value.

      Tech Tips

      The noted +BS voltage value is used in a later step.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. B0071RIC72
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Turn the ignition 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 A34 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
      A34-42 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-42 (STP) - Body ground Stop light switch assembly off (Brake pedal released) Below 1.5 V
      A34-10 (STPO) - Body ground Always 11 to 14 V
      A34-44 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-44 (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 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 - SHIFT LOCK CONTROL UNIT ASSEMBLY) Click here

    C

    CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY) Click here

    D

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

    E

    CHECK STOP LIGHT SWITCH ASSEMBLY POWER SOURCE CIRCUIT Click here

    A

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


    1. Reconnect the A34 skid control ECU (brake actuator assembly) 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

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
      OK
      Stop light turns ON/OFF in response to the GTS operation
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT BRAKE ACTUATOR ASSEMBLY Click here

    OK

  4. CHECK FOR DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs

    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

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

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

    4. Check if the same DTC is output.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      C1380 is output A
      C1380 is not output B

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

    B

    USE SIMULATION METHOD TO CHECK Click here

  5. INSPECT BRAKE ACTUATOR ASSEMBLY


    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

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
    2. B006ZKDC72
      *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
      A37-4 (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 BRAKE ACTUATOR ASSEMBLY for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

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


    1. B0071RIC71
      *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 K27 shift lock control ECU (shift lock control unit assembly) connector (w/ Smart Entry and Start System).

    3. Disconnect the K28 shift lock control ECU (shift lock control unit assembly) connector (w/o Smart Entry and Start System).

    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
      A34-42 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-42 (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 SHIFT LOCK CONTROL UNIT ASSEMBLY for UA80E: Click here
    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY for UB80E: Click here
    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY for U760E: Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ECM)


    1. B0071RIC71
      *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 A23 ECM connector (for 2GR-FKS).

    3. Disconnect the A24 ECM connector (for A25A-FKS).

    4. Disconnect the A22 ECM connector (for 2AR-FE).

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

      OK
      No deformation or corrosion.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A34-42 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-42 (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
      Result Proceed to
      OK A
      NG (w/ Smart Entry and Start System) B
      NG (w/o Smart Entry and Start System) C

    A

    REPLACE ECM for 2GR-FKS: Click here
    REPLACE ECM for A25A-FKS: Click here
    REPLACE ECM for 2AR-FE: Click here

    C

    GO TO STEP 9 Click here

    B

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


    1. B0071RIC71
      *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 R8 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
      A34-42 (STP) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-42 (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 SMART KEY ECU ASSEMBLY

    NG

  9. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)


    1. B0071RIC71
      *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 A37 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
      A34-42 (STP) - 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 (BRAKE ACTUATOR 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
      A34-42 (STP) - A37-3 (L) Always Below 1 Ω
      A34-42 (STP) or A37-3 (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 (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 connector.

      OK
      The connector is securely connected.

    2. Disconnect the A37 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
      A34-10 (STPO) - A37-4 (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 (BRAKE ACTUATOR ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH)


    1. B0071RIC73
      *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 W13 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
      A34-44 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-44 (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 REAR COMBINATION LIGHT ASSEMBLY LH Click here

    NG

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


    1. B0071RIC73
      *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 W12 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
      A34-44 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-44 (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 REAR COMBINATION LIGHT ASSEMBLY RH Click here

    NG

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


    1. B0071RIC73
      *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 R47 center stop light (center stop light set) 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
      A34-44 (STP2) - Body ground Stop light switch assembly on (Brake pedal depressed) (+BS x 0.85) to 14 V*
      A34-44 (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 CENTER STOP LIGHT SET Click here

    NG

  15. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)


    1. B0071RIC73
      *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 A37 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
      A34-44 (STP2) - 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 (BRAKE ACTUATOR 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
      A37-1 (OUT) - A34-44 (STP2) Always Below 1 Ω
      A37-1 (OUT) or A34-44 (STP2) - 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. B0070BBC05
      *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 A37 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
      A37-2 (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
      A37-7 (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 (BRAKE ACTUATOR 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
      A34-10 (STPO) or A37-4 (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