VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1380/64

DTC Code DTC Name
C1380/64 Stop Light Control Relay Malfunction

DESCRIPTION

Upon receiving the hill-start assist control or the dynamic radar cruise control (for vehicles with the dynamic radar cruise control) operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.

DTC Code DTC Detection Condition Trouble Area
C1380/64

Either of the following is detected:


  1. When the stop light control (BRK-LP) relay drive output (STPO) is ON, the relay contact remains open (signal is not input to the STP1 terminal) for 5 seconds or more.

  2. When the stop light control (BRK-LP) relay drive output (STPO) is OFF, the relay contact remains closed (signal at the STP1 terminal is different from the input signal at the STP2) for 5 seconds or more.

  3. When the stop light control (BRK-LP) relay drive output (STPO) is OFF, and the stop light switch ON, the stop light switch monitor (STP2) is OFF for 5 seconds or more.

  • Stop light switch

  • Stop light switch circuit

  • Stop light control (BRK-LP) relay

  • Stop light control (BRK-LP) relay circuit

  • Skid control ECU

WIRING DIAGRAM

Refer to DTC C1249/49 Click here.

INSPECTION PROCEDURE

Note

When replacing the skid control ECU, perform zero point calibration and store system information Click here.

Tech Tips

When C1249/49 is output together with C1380/64, inspect and repair the trouble areas indicated by C1249/49 first Click here.

PROCEDURE


  1. CHECK STOP LIGHT OPERATION


    1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

      OK
      Condition Illumination Condition
      Brake pedal depressed ON
      Brake pedal released OFF

    NG

    INSPECT STOP LIGHT CIRCUIT Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Select the Data List mode on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch / ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      		 -

    4. Check that the stop light switch condition observed on the intelligent tester changes according to brake pedal operation.

      OK
      The intelligent tester displays ON or OFF according to brake pedal operation.

    NG

    INSPECT SKID CONTROL ECU (STP1 TERMINAL) Click here

    OK

  3. INSPECT SKID CONTROL ECU (STP2 TERMINAL)


    1. A0160JOE06

      Turn the engine switch off.

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

    3. Disconnect the skid control ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A35*1, J98*2-20 (STP2) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      A35*1, J98*2-20 (STP2) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

      *1: for LHD

      *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

    OK

  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (STOP LIGHT CONTROL (BRK-LP) RELAY)


    1. Reconnect the skid control ECU connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Select the Active Test mode on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Stop Light Relay Stop light control (BRK-LP) relay Relay ON/OFF Stop lights come on

    5. Check that the "ON" and "OFF" of the stop lights can be shown on the rear combination light by the intelligent tester.

      OK
      The stop lights turn on or off in accordance with the intelligent tester.

    NG

    INSPECT STOP LIGHT CONTROL RELAY (BRK-LP) Click here

    OK

  5. RECONFIRM DTC


    1. Turn the engine switch off.

    2. Clear the DTCs Click here.

    3. Turn the engine switch on (IG).

    4. Perform a road test.

    5. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC (C1380/64) is not output A
      DTC (C1380/64) is output B

    B

    REPLACE SKID CONTROL ECU Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

  6. INSPECT STOP LIGHT CONTROL RELAY (BRK-LP)


    1. A0162XNE11

      Turn the engine switch off.

    2. Remove the stop light control (BRK-LP) relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 Voltage is not applied between terminals 1 and 2 Below 1 Ω
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 4 Voltage is applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE STOP LIGHT CONTROL RELAY (BRK-LP)

    OK

  7. INSPECT ENGINE ROOM NO. 3 RELAY BLOCK (POWER SOURCE TERMINAL)


    1. A0161NGE12

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Stop light control (BRK-LP) relay terminal 5 - Body ground Always 11 to 14 V
      Stop light control (BRK-LP) relay terminal 2 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  8. INSPECT SKID CONTROL ECU (STPO TERMINAL)


    1. A0160JOE04

      Install the stop light control (BRK-LP) relay.

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

    3. Disconnect the skid control ECU connector.

    4. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A35*1, J98*2-21 (STPO) - Body ground Engine switch on (IG) 11 to 14 V

      *1: for LHD

      *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)

    OK

    REPLACE SKID CONTROL ECU Click here

  9. INSPECT SKID CONTROL ECU (STP1 TERMINAL)


    1. A0163E5E07

      Turn the engine switch off.

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

    3. Disconnect the skid control ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      J77-10 (STP1) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      J77-10 (STP1) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT)

    OK

    REPLACE SKID CONTROL ECU Click here