Dtc C1380/64 Stop Light Control Relay Malfunction

Brake. Lexus Is250, Is220D. Gse20 Ale20
Brake Control. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STOP SW FUSE

CHECK STOP LIGHT OPERATION

INSPECT SKID CONTROL ECU (STP1 TERMINAL)

INSPECT SKID CONTROL ECU (STP2 TERMINAL)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (STOP LIGHT CONTROL RELAY)

INSPECT STOP LIGHT CONTROL RELAY

INSPECT STOP LIGHT CONTROL RELAY (POWER SOURCE TERMINAL)

INSPECT SKID CONTROL ECU (STPO TERMINAL)

RECONFIRM DTC

DTC C1380/64 Stop Light Control Relay Malfunction


DESCRIPTION

Upon receiving the hill-start assist control (HAC) operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.

DTC No.
DTC Detection Condition
Trouble Area
C1380/64
When either of the following is detected:
  1. When the voltage at the IG1 terminal is between 10 to 14 V and the stop light control relay drive output (STPO) is ON, a signal has not been input to the STP terminal for 5 seconds or more.
  2. When the voltage at the IG1 terminal is between 10 to 14 V and the stop light control relay drive output (STPO) is OFF, the signal at the STP1 is different from the input signal at the STP2 for 5 seconds or more.
  1. STOP SW fuse
  2. Stop light switch
  3. Stop light switch circuit
  4. Stop light control relay (A/T)
  5. Stop light control relay circuit (A/T)
  6. Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction


INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (Click here).
HINT:
When C1249/49 is output together with C1380/64, inspect and repair the trouble areas indicated by C1249/49 first.
1.INSPECT STOP SW FUSE


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction

  1. Remove the STOP SW fuse from the main body ECU RH.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    STOP SW (7.5 A) fuse
    		Always
    		Below 1 Ω


NG
REPLACE STOP SW FUSE
OK


2.CHECK STOP LIGHT OPERATION

  1. Install the STOP SW fuse.

  1. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

    OK:

    Condition
    		Illumination Condition
    Brake pedal depressed
    		ON
    Brake pedal released
    		OFF


NG
INSPECT STOP LIGHT CIRCUIT
OK


3.INSPECT SKID CONTROL ECU (STP1 TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction

  1. Disconnect the skid control ECU connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A14-27 (STP1) - Body ground
    		Stop light switch ON (Brake pedal depressed)
    		8 to 14 V
    A14-27 (STP1) - Body ground
    		Stop light switch OFF (Brake pedal released)
    		Below 1.5 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT)
OK


4.INSPECT SKID CONTROL ECU (STP2 TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A14-27 (STP1) - A14-21 (STP2)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)
OK


5.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (STOP LIGHT CONTROL RELAY)

  1. Reconnect the skid control ECU connector.

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Select the Active Test mode on the intelligent tester.

    ABS / VSC:
    Item (Display)
    		Measurement Item / Range (Display)
    		Normal Condition
    Stop Lamp Relay
    		Turns stop light control relay ON / OFF
    		Stop light comes on (Does not come on for 5 seconds or more)

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

    OK:
    The stop light turns on or off in accordance with the intelligent tester.


OK
Go to step 9
NG


6.INSPECT STOP LIGHT CONTROL RELAY


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction

  1. Turn the engine switch off.

  1. Remove the stop light control relay.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 4
    		Always
    		Below 1 Ω
    3 - 5
    		Always
    		10 kΩ or higher
    3 - 4
    		When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2
    		10 kΩ or higher
    3 - 5
    		When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2
    		Below 1 Ω


NG
REPLACE STOP LIGHT CONTROL RELAY
OK


7.INSPECT STOP LIGHT CONTROL RELAY (POWER SOURCE TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    Stop light control relay terminal 5 - Body ground
    		Always
    		8 to 14 V
    Stop light control relay terminal 2 - Body ground
    		Engine switch on (IG)
    		8 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


8.INSPECT SKID CONTROL ECU (STPO TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim). Dtc C1380/64 Stop Light Control Relay Malfunction

  1. Turn the engine switch off.

  1. Install the stop light control relay.

  1. Disconnect the skid control ECU connector.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A14-16 (STPO) - Body ground
    		Engine switch on (IG)
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)
OK


9.RECONFIRM DTC

  1. Turn the engine switch off.

  1. Reconnect the skid control ECU connector.

  1. Clear the DTC (Click here).

  1. Check if the same DTC is recorded (Click here).

    Result:

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


B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

USE SIMULATION METHOD TO CHECK