Dtc C1380 Stop Light Control Relay Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (STOP LIGHT RELAY)

CHECK TERMINAL VOLTAGE (STP2)

RECONFIRM DTC

CHECK TERMINAL VOLTAGE AND RESISTANCE (+B, GND)

CHECK TERMINAL VOLTAGE (STP)

CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL ECU ASSEMBLY - MASTER CYLINDER SOLENOID)

CHECK TERMINAL VOLTAGE (STP)

CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT CONTROL ECU ASSEMBLY)

CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - STOP LIGHT CONTROL ECU ASSEMBLY)

DTC C1380 Stop Light Control Relay Malfunction


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
C1380
Either condition is met:
  1. When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control ECU assembly drive output (STPO) is on, a signal is not input to the STP2 terminal for 5 seconds or more.
  2. When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control ECU assembly drive output (STPO) is off, the signal at the STP terminal is different from the input signal at the STP2 terminal for 5 seconds or more.
  1. STOP fuse
  2. Stop light switch circuit
  3. Stop light control ECU assembly
  4. Stop light control ECU circuit
  5. Skid control ECU (Master cylinder solenoid)

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1380 Stop Light Control Relay Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the skid control ECU (master cylinder solenoid), perform calibration (LandCruiser RM00000452J00ZX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
When DTC C1425 is output together with DTC C1380, inspect and repair the trouble areas indicated by DTC C1425 first (LandCruiser RM000000XIE0VFX.html).
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
Go to step 6
OK


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

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

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

    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
    		-

  1. 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
Go to step 9
OK


3.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (STOP LIGHT RELAY)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

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

    ABS/VSC/TRC
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Stop Light Relay
    		Stop light control ECU
    		ECU ON/OFF
    		Observe the stop lights (do not come on for 2 to 5 seconds).

  1. While performing the Active Test, check the illumination condition of the stop lights and "Stop Light Relay Output" in the Data List.

    ABS/VSC/TRC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Stop Light Relay Output
    		Stop light control ECU output/ ON or OFF
    		ON: Stop light control ECU on (Stop lights on)
    OFF: Stop light control ECU off (Stop lights off)
    		-

Result
Result
Proceed to
When Active Test performed, Data List item changes between ON and OFF and stop lights turn on and off
A
When Active Test performed, Data List item changes between ON and OFF, but stop lights do not turn on
B


B
Go to step 10
A


4.CHECK TERMINAL VOLTAGE (STP2)

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



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1380 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
    A7-45 (STP2) - Body ground
    		Brake pedal depressed
    		8 to 14 V
    Brake pedal released
    		Below 1.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Master Cylinder Solenoid])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.RECONFIRM DTC

  1. Clear the DTCs (LandCruiser RM0000046KV016X.html).

  1. Start the engine.

  1. Perform a road test.

  1. Check if the same DTC is output (LandCruiser RM0000046KV016X.html).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output (for LHD)
    		B
    DTC is output (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

6.CHECK TERMINAL VOLTAGE AND RESISTANCE (+B, GND)

  1. Disconnect the A54 stop light control ECU assembly connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1380 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
    A54-6 (+B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A54-8 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Control ECU Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK TERMINAL VOLTAGE (STP)

  1. Disconnect the A54 stop light control ECU assembly connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1380 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
    A54-5 (STP) - Body ground
    		Brake pedal depressed
    		8 to 14 V
    Brake pedal released
    		Below 1.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Control ECU Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL ECU ASSEMBLY - MASTER CYLINDER SOLENOID)

  1. Disconnect the A54 stop light control ECU assembly connector.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A54-1 (OUT) - A7-45 (STP2)
    		Always
    		Below 1 Ω
    A54-1 (OUT) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STOP LIGHT CONTROL ECU ASSEMBLY (LandCruiser RM000003MWQ02KX.html)

9.CHECK TERMINAL VOLTAGE (STP)

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



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1380 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
    A7-7 (STP) - Body ground
    		Brake pedal depressed
    		8 to 14 V
    Brake pedal released
    		Below 1.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Master Cylinder Solenoid])
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for LHD)
    		B
    OK (for RHD)
    		C


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

  1. Disconnect the A54 stop light control ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A7-16 (STPO) - A54-9 (ACC)
    		Always
    		Below 1 Ω
    A7-16 (STPO) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

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

  1. Disconnect the A54 stop light control ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A7-45 (STP2) - A54-1 (OUT)
    		Always
    		Below 1 Ω
    A7-45 (STP2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STOP LIGHT CONTROL ECU ASSEMBLY (LandCruiser RM000003MWQ02KX.html)